22PBB – Steering Fasteners May Fail – 2018-2020 Peterbilt 330, 337, 348, 365, 367, 389, 520, 567, & 579

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Our records indicate that these vehicles are affected by 22PBB and are owned by June 27, 2020 Subject: Safety Recall: 22PBB – Dana Front Axle Steer Arm Fasteners NHTSA: 22V277 EXPIRATION DATE: NONE This notice applies to your vehicle. Your VIN(s) can be found on the bottom or back of this page. Dear Peterbilt Customer, This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. Peterbilt has decided that a defect which relates to motor vehicle safety exists in certain 2018-2020 Model 330, 337, 348, 365, 367, 389, 520, 567, and 579 vehicles equipped with a Dana D-Series front axle. The Dana D-Series axle steer arm fasteners that attach the steer arm to the steering knuckle may fail. These cases are understood to have occurred during low speed maneuvering when steering forces are highest. The operator could be unaware of an issue with the steer arm fasteners, increasing the risk of a crash and/or personal injury. What is the problem? The Dana D-Series axle steer arm fasteners that attach the steer arm to the steering knuckle may fail. What will your dealer do? When the repair procedure and parts are available, your dealer will replace the necessary parts per the decided repair procedure. What should you do? There is no action required on your part at this time. You will receive a letter notifying you when the repair procedure and parts are available. Peterbilt Motors Company has initiated this recall to remedy the issue with no charge to you. Currently, the repair procedure is unavailable to correct this condition. However, Peterbilt is required to notify customers of the existence of the identified safety defect. You will be notified by mail when the repair procedure and parts become available. If you require further information about this recall, reimbursement of a pre-notification remedy associated with this recall, or experience any difficulty in making arrangements for this repair, please contact: Peterbilt Motors Company, 1700 Woodbrook St, Denton, TX 76205, Attn: Customer Service Department. If you conclude that Peterbilt has not enabled you to remedy this defect in a reasonable time and without charge, you may submit a complaint to: Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, S.E., Washington, DC 20590, or call the toll free Vehicle Safety Hotline at 1-888-327-4236 (TTY: 1-800-424-9153); or go to http://www.safercar.gov. Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days. If you no longer own this vehicle, we would appreciate your advising us of the new owner. Please send all known ownership and address changes to PBDiv.Warranty.Docs@paccar.com. We apologize for any inconvenience this preventive procedure may cause and thank you for your participation in helping Peterbilt provide the highest levels of customer satisfaction and service expertise. We value your business and appreciate your ongoing loyalty to Peterbilt and its dealer network. Industry-leading quality, performance and reliability are hallmarks of Peterbilt products, and we thank you for making Peterbilt your truck of choice. Sincerely, Michelle Ponsonby Director of Customer Service Peterbilt Motors Company IMPORTANT SAFETY RECALL Interim Notification Scan this QR code to open the Peterbilt Dealer Locator. AHEEEHA CJDHENJNDLEFJHIDO AHEEEHA BNFFFNB MGAOALIKAKBON M A BNFFFNB FOBAOCFH DFNHJDGCCBKADJAGMAINALAB ALLJFHFHEBDIANDGHJ EJOHGEGMKHBMD IEMDMFED JNMCEJHOE AFCDOGANADFML MFOEDEFHMLGBKOEIDLMLBDNJENIEOCHFI MFFNFNE ACOBBOMLCEMI KDMAHFHACOO A BBB A JCLKDADFBCG JHDAAFEAGNHHC HHHHHHH HH H H HH H H H H H H

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No. 22PBB – NHTSA 22V277 – TC 2022-210 Page 1 of 4 22PBB – Dana Front Axle Steer Arm Fasteners Author: Darrell Cook 8/12/2022 Title (metadata) 22PBB – Dana Front Axle Steer Arm Fasteners – NHTSA ID: 22V277, TC: 2022- 210 Bulletin No. 22PBB – NHTSA 22V277 – TC 2022-210 Description 22PBB – Dana Front Axle Steer Arm Fasteners Supplier Dana Section Front Axle – 11 What’s New Abstract Safety Recall – The Dana D-Series front axle steer arm fasteners that attach the steer arm to the steering knuckle may fail. The operator could be unaware of an issue until both fasteners fail and result in loss of steering control, increasing the risk of a crash. Please see attached repair procedure and parts list. Revision Introduction On certain vehicles with the Dana D-Series front axle, the steer arm fasteners that attach the steer arm to the steering knuckle may fail. These rare cases are understood to have occurred during low-speed maneuvering when steering forces are highest. The operator could be unaware of an issue until both fasteners fail and result in loss of steering control, increasing the risk of a crash. Situation (Chassis Affected) PB— 9,048 (8,681 US / 367 Canada) 330, 337, 348, 365, 367, 389, 520, 567, and 579 chassis model year 2018 through 2020 vehicles built from 08/01/2017 through 05/31/2019 with a Dana D-Series front axle. Resolution Safety Recall Service all affected chassis that enter your dealership, even if the customer has no issue with the chassis. 22PBB – Dana Front Axle Steer Arm Fasteners 22PBB – NHTSA 22V277 – TC 2022-210 Page 2 of 4 1. Review the attached chassis list for your dealer code and schedule your customer(s) for service if their chassis is on the list. 2. If you are not using Service Management to start repair orders, review SIR for “Complete” or “In Process” next to the “22PBB” campaign code prior to performing this repair. 3. Follow the procedure to remove and replace the steer arm fasteners. Warranty Parts There is no time or mileage limit for this recall. Peterbilt will pay for parts at dealer net plus applicable mark up and labor: • 0.9 hours labor to remove and replace the front axle steering arm fasteners. Use Quick Claim Code 22PBBA. *Note: Please replace one bolt at a time to avoid separating the steering arm from the knuckle, (as detailed in the repair procedure). • If any bolt is found to be missing, broken, or damaged in any way, please STOP and call Dana Real Time Warranty at 877-777-5360, Option #3 • If it appears any other steering parts need to be replaced, (listed as “Optional” in the repair procedure), please STOP and call Dana Real Time Warranty at 877-777-5360, Option #3 • File an additional claim for extraordinary circumstances. A quick claim for standard labor must be filed first. Please reference 22PBBA. File the claim within 14 days in accordance with Warranty Policy. Warranty Parts Background Take-Off Parts Disposition: Destroy parts 30 days after the claim has been paid. PRWS CLAIM CODING Campaign Code: 22PBB Campaign Type Safety Recall Claim Category: Truck Repair Type Proactive Customer Concern Code 199 Causal Code A1 Corrective Action Code 12 Responsibility Code: Camp or Supplier Failure Location 011-001-004 Causal Part 10000180 22PBB – Dana Front Axle Steer Arm Fasteners 22PBB – NHTSA 22V277 – TC 2022-210 Page 3 of 4 Supplier Code Dana 05679AB SRT Code B22-PBB 0.9 hrs – replace steering arm fasteners Display in SIR Always Visible Editable by dealer? No KW AutoPay Choose an item. PB AutoPay No Parts are available from PACCAR Parts. Quantity Part Number Description 2 10000180 Bolt, Hex 1 10045885 Hub Seal 1 SKF #453869 Hubcap paper seal 1 Source locally Hub oil, (SAE 75W-90) 0.45 Qt. MAX Procedure Please follow your dealership’s safety procedures and precautions to ensure the vehicle can be safely repaired and maintained. See the attached Procedure. Links Chassis List Procedure U.S. Customer Letter Canada Customer Letter (English) Canada Customer Letter (French) Channels KWUS ☐ KWCA☐ KWGS☐ PBUS☒ PBCA☒ Same bulletin published to KW & PB regions? No Publish On Click or tap to enter a date. 22PBB – Dana Front Axle Steer Arm Fasteners 22PBB – NHTSA 22V277 – TC 2022-210 Page 4 of 4 Standard Repair Time Process Documentation SRT SRT Time Actual Time Time Study Date Model N/A .9 51:37 06/15/22 389 Re-install in Reverse Order Dana steering arm bolts remove and replace ©2021 PACCAR Corporation Confidentiality Notice: This document and the information contained herein is proprietary. It shall not be reproduced, copied or disclosed, in whole or in part, or used for manufacture without the written permission of PACCAR. You are hereby notified that any dissemination of this information is strictly prohibited. Standard Repair Time Process Documentation Dana steering arm bolts remove and replace Tools: Equipment: 3/4 torque wrench 3/8 impact Rubber hammer Steel hammer 3/4 impact Heelbar Diagonal cutters Pliers Snap ring pliers Small flat tip screw-driver 10mm wrench 30mm socket 2 inch socket 1 3/16 socket 1 5/16 socket 1/4 inch wratchet 8mm Allen socket Floor jack Drain pan Jack stands 75W 90W oil Wheel dolly Standard Repair Time Process Documentation Dana steering arm bolts remove and replace Step 1: Lift axle onto jack stands Step 2: R&R tire. Step 3: R&R brake pads. Standard Repair Time Process Documentation Dana steering arm bolts remove and replace Step 4: R&R speed sensor cable zip ties and clips and move away from rotor assembly. Step 5: R&R brake caliper carrier mounting bolts and support. (6 bolts) Step 6: Drain oil from hub. (1 8mm Allen plug) Note* Use new hub oil Standard Repair Time Process Documentation Dana steering arm bolts remove and replace Step 7: R&R Hub oil cover. (6 13mm bolts) Note* Use new hub cap seal. Step 8: R&R snap ring from hub assembly. Step 9: R&R nut from hub assembly. (2 inch nut) Remove hub assembly. Note* Hub nut torque will depend on the hub manufacturer. Standard Repair Time Process Documentation Dana steering arm bolts remove and replace Step 10: R&R wheel seal. Note* use new wheel seal. Step 11: R&R both 20mm bolts one at a time to avoid separating the arm from the knuckle. Torque: 650Nm—675Nm (480—498 lbs ft. Step 12: Clean spindle for reinstallation. Note* Do not use Loctite, any other thread locking compound or when installing. Threads must be free of oil, grease, and/or other contaminants prior to assembly. Standard Repair Time Process Documentation Dana steering arm bolts remove and replace Optional: if a bolt or bolts are broken R&R drag link castle nut. (1 30mm nut, 1 cotter pin) Step 11: R&R both 30mm bolts one at a time. Optional: if a bolt or bolts are broken R&R drag link castle nut. (1 30mm nut, 1 cotter pin) Notes: Any optional or extra parts that need to be replaced will need to run through the Dana pre-call checklist and the Dana Real Time Warranty number (Option #3) included in the re-pair procedure. If a bolt is found to be missing, broken, or damaged, we recommend Dana real-time involvement to examine if additional parts are needed. (877-777-5360 Option #3) Do not use Loctite, any other thread locking compound or lube when installing. Threads must be free of oil, grease, and/or other contaminants prior to assembly.

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 Edit  Clone 22PBB – Dana Front Axle Steer Arm Fasteners – NHTSAID: 22V277, TC: 2022-210 Number 22PBB Supplier Dana Description 22PBB – Dana Front Axle Steer Arm Fasteners – NHTSA ID: 22V277, TC: 2022-210 Date 5/10/2022 What’s New Safety Recall – The Dana D-Series front axle steer arm fasteners that att ach the steer arm to the steering knucklemay fail. The operator could be unaware of an issue unti l both fasteners fail and result in loss of steering control,increasing the risk of a crash or injury. Repair informati on will be added when a repair procedure and parts areavailable. Introduction On certain vehicles with the Dana D-Series front axle, the steer arm fasteners that att ach the steer arm to thesteering knuckle may fail. These rare cases are understood to have occurred during low speed maneuvering whensteering forces are highest. The operator could be unaware of an issue unti l both fasteners fail and result in loss ofsteering control, increasing the risk of a crash or injury. Situation 9,048 (8,681 US / 367 Canada) 330, 337, 348, 365, 367, 389, 520, 567, and 579 chassis model year 2018 through2020 vehicles built from 08/01/2017 through 05/31/2019 with a Dana D-Series front axle. Resolution Safety Recall Service all affected chassis that enter your dealership, even if the customer has no issue with the chassis. 1. Review the attached chassis list for your dealer code and schedule your customer(s) for service if theirchassis is on the list. 2. If you are not using Service Management to start repair orders, review SIR for “Complete” or “In Process”next to the “22PBB” campaign code prior to performing this repair. 3. Follow the procedure to remove and replace the steer arm fasteners. Federal Law It is a violation of Federal law for a dealer to sell or lease new vehicles covered by this recall until the defect ornoncompliance has been corrected. Warranty There is no ti me or mileage limit for this recall. Peterbilt will pay for parts at dealer net plus applicable mark upand labor: • 0.9 hours labor to remove and replace the front axle steering arm fasteners. Use Quick Claim Code 22PBBA.*Note: Please replace one bolt at a ti me to avoid separati ng the steering arm from the knuckle, (as detailed in therepair procedure). • If any bolt is found to be missing, broken, or damaged in any way, please STOP and call Dana Real Time Warrantyat 877-777-5360, Opti on #3 • If it appears any other steering parts need to be replaced, (listed as “Opti onal” in the repair procedure), pleaseSTOP and call Dana Real Time Warranty at 877-777-5360, Opti on #3 • File an additi onal claim for extraordinary circumstances. A quick claim for standard labor must be fi led fi rst. Please reference 22PBBA. File the claim within 14 days in accordance with Warranty Policy. PRWS CLAIM CODING CampaignCode: 22PBB CampaignType Safety Recall ClaimCategory: Truuck Repair Type Proactive CustomerConcernCode 199 Causal Code A1 CorrectiveActionCode 12 ResponsibilityCode: Supplier FailureLocation 011-001-004 Causal Part 10000180 SupplierCode 05679AB SRT Code B22-PBB Procedure Please follow your dealership’s safety procedures and precautions to ensure the vehiclecan be safely repaired and maintained. See the attached Procedure in Links section. Parts Parts are available from PACCAR Parts. Quantity PartNumber Description 2 10000180 Bolt, Hex 1 CM10045885 Hub Seal 1 453869-8CHR Hubcap paper seal 1 Source Local Hub oil, (SAE 75W-90) 0.45qt. MAX AsNeeded Source Local Cable Ties (Wheel SpeedSensor Cable) Links Chassis List 22PBB – Repair Procedure Revision A 9-30-22 US Customer Lett er Authored by D. Cook Revision History 10/07/2022 – Updated Interim bulletin to Final.

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-277 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : APR 25, 2022 NHTSA Recall No. : 22V-277 Manufacturer Recall No. : 22 PBB and 22 KWB Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 17,641 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2018-2020 Kenworth T270, T370, T440, T470, T660, T680, T800, T880, W900 and W990 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Recall population corresponds to production during build months associated with failed axles, plus 3 months after last build date for a known failed axle. Production Dates : AUG 01, 2017 – MAY 31, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2018-2020 Peterbilt 330, 337, 348, 365, 367, 389, 520, 567, 579 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Recall population corresponds to production in build months associated with failed axles, plus 3 months after last build date for a known failed axle. Production Dates : AUG 01, 2017 – MAY 31, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : The Dana D-Series axle steer arm fasteners, that attach the steer arm to the steering knuckle, may fail. Reported failures occurred during low speed maneuvering operations when steering forces are highest. FMVSS 1 : NR FMVSS 2 : NR Part 573 Safety Recall Report 22V-277 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of the Safety Risk : Failure of both fasteners can result in a loss of steering control, which could increase the risk of a crash or injury. Description of the Cause : The cause is under investigation Identification of Any Warning that can Occur : NR Involved Components : Component Name 1 : Dana IADB (Integrated Air Disc Brake) D-Series ste Component Description : Dana IADB (Integrated Air Disc Brake) D-Series steer axle Component Part Number : B05-6041* Supplier Identification : Component Manufacturer Name : Dana, Inc Address : 3939 Technology Dr Maumee Ohio 43537 Country : United States Chronology : 8/10/2020: Safety & Compliance received notification of field failure 8/12/2020: Dana notified and requested parts to be sent to them 8/27/2020: Weekly meetings started with Dana 9/17/2020: First Dana bench test set up 9/25/2020: Issue discussed at NHTSA quarterly meeting 11/5/2020: Reviewed Dana bench testing and instrumented vehicle data 1/25/2021: Continued weekly reviews with Dana testing attempting to replicate field issues 2/3/2021: Update given to NHTSA during quarterly meeting 3/4/2021: Customer review list provided to Dana for inspections 3/26/2021: 1st customer Inspection completed with no issues found 4/20/2021: 2nd customer inspection completed, no issues found 5/20/2021: Revised Dana bench test set up reviewed 5/26/2021: Update given to NHTSA during quarterly meeting 6/3/2021: 3rd customer inspection completed, 118 truck inspected to date 6/24/2021: 4th & 5th customer inspections completed, 158 total inspections, no issues 7/8/2021: Dana took customer truck with previous failure for track instrumentation Part 573 Safety Recall Report 22V-277 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 8/12/2021: Non-failed knuckles returned from field to check bolt tension 9/3/2021: Update given to NHTSA during quarterly meeting 9/23/2021: Dana visited customer measured bolt tension and replaced bolts in 15 units 9/30/2021: Dana visited KW plant and measured many drag link angles 10/7/2021: Bench test suspended and to be reconfigured 12/9/2021: Bench test reconfigured and began running series of new tests 1/6/2022: 4 bench tests completed and 2 in progress 1/20/2022: RH turn testing suspended with high cycle count and no failures 2/17/2022: 7 LH tests complete and two in progress 3/3/2022: 12 LH tests completed and 1 in progress 3/16/2022: Update given to Joint Safety Committee 3/24/2022: Update given to NHTSA during quarterly meeting 3/31/2022: 17 LH tests completed and 2 in progress 4/14/2022: 29 LH tests completed including 5 E-series baseline tests and 1in progress. 4/18/2022: Joint Safety Committee determines a recall will be initiated Description of Remedy : Description of Remedy Program : The remedy program is under development. The 573 will be amended once a remedy has been developed and validated. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Notification letters will be sent within 60 days Planned Dealer Notification Date : JUN 24, 2022 – JUN 24, 2022 Planned Owner Notification Date : JUN 24, 2022 – JUN 24, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-277 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : JUN 03, 2022 NHTSA Recall No. : 22V-277 Manufacturer Recall No. : 22 PBB and 22 KWB Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 17,641 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2018-2020 Kenworth T270, T370, T440, T470, T660, T680, T800, T880, W900 and W990 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Recall population corresponds to production during build months associated with failed axles, plus 3 months after last build date for a known failed axle. Production Dates : AUG 01, 2017 – MAY 31, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2018-2020 Peterbilt 330, 337, 348, 365, 367, 389, 520, 567, 579 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Recall population corresponds to production in build months associated with failed axles, plus 3 months after last build date for a known failed axle. Production Dates : AUG 01, 2017 – MAY 31, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : The Dana D-Series axle steer arm fasteners, that attach the steer arm to the steering knuckle, may fail. Reported failures occurred during low speed maneuvering operations when steering forces are highest. FMVSS 1 : NR FMVSS 2 : NR Part 573 Safety Recall Report 22V-277 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of the Safety Risk : Failure of both fasteners can result in a loss of steering control, which could increase the risk of a crash or injury. Description of the Cause : The cause is under investigation Identification of Any Warning that can Occur : NR Involved Components : Component Name 1 : Dana IADB (Integrated Air Disc Brake) D-Series ste Component Description : Dana IADB (Integrated Air Disc Brake) D-Series steer axle Component Part Number : B05-6041* Supplier Identification : Component Manufacturer Name : Dana, Inc Address : 3939 Technology Dr Maumee Ohio 43537 Country : United States Chronology : 8/10/2020: Safety & Compliance received notification of field failure 8/12/2020: Dana notified and requested parts to be sent to them 8/27/2020: Weekly meetings started with Dana 9/17/2020: First Dana bench test set up 9/25/2020: Issue discussed at NHTSA quarterly meeting 11/5/2020: Reviewed Dana bench testing and instrumented vehicle data 1/25/2021: Continued weekly reviews with Dana testing attempting to replicate field issues 2/3/2021: Update given to NHTSA during quarterly meeting 3/4/2021: Customer review list provided to Dana for inspections 3/26/2021: 1st customer Inspection completed with no issues found 4/20/2021: 2nd customer inspection completed, no issues found 5/20/2021: Revised Dana bench test set up reviewed 5/26/2021: Update given to NHTSA during quarterly meeting 6/3/2021: 3rd customer inspection completed, 118 truck inspected to date 6/24/2021: 4th & 5th customer inspections completed, 158 total inspections, no issues 7/8/2021: Dana took customer truck with previous failure for track instrumentation Part 573 Safety Recall Report 22V-277 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 8/12/2021: Non-failed knuckles returned from field to check bolt tension 9/3/2021: Update given to NHTSA during quarterly meeting 9/23/2021: Dana visited customer measured bolt tension and replaced bolts in 15 units 9/30/2021: Dana visited KW plant and measured many drag link angles 10/7/2021: Bench test suspended and to be reconfigured 12/9/2021: Bench test reconfigured and began running series of new tests 1/6/2022: 4 bench tests completed and 2 in progress 1/20/2022: RH turn testing suspended with high cycle count and no failures 2/17/2022: 7 LH tests complete and two in progress 3/3/2022: 12 LH tests completed and 1 in progress 3/16/2022: Update given to Joint Safety Committee 3/24/2022: Update given to NHTSA during quarterly meeting 3/31/2022: 17 LH tests completed and 2 in progress 4/14/2022: 29 LH tests completed including 5 E-series baseline tests and 1in progress. 4/18/2022: Joint Safety Committee determines a recall will be initiated Description of Remedy : Description of Remedy Program : The remedy program is under development. The 573 will be amended once a remedy has been developed and validated. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Notification letters will be sent within 60 days Planned Dealer Notification Date : JUN 24, 2022 – JUN 24, 2022 Planned Owner Notification Date : JUN 24, 2022 – JUN 24, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-277 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : JUN 03, 2022 NHTSA Recall No. : 22V-277 Manufacturer Recall No. : 22 PBB and 22 KWB Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 17,641 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2018-2020 Kenworth T270, T370, T440, T470, T660, T680, T800, T880, W900 and W990 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Recall population corresponds to production during build months associated with failed axles, plus 3 months after last build date for a known failed axle. Production Dates : AUG 01, 2017 – MAY 31, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2018-2020 Peterbilt 330, 337, 348, 365, 367, 389, 520, 567, 579 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Recall population corresponds to production in build months associated with failed axles, plus 3 months after last build date for a known failed axle. Production Dates : AUG 01, 2017 – MAY 31, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : The Dana D-Series axle steer arm fasteners, that attach the steer arm to the steering knuckle, may fail. Reported failures occurred during low speed maneuvering operations when steering forces are highest. FMVSS 1 : NR FMVSS 2 : NR Part 573 Safety Recall Report 22V-277 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of the Safety Risk : Failure of both fasteners can result in a loss of steering control, which could increase the risk of a crash or injury. Description of the Cause : The cause is under investigation Identification of Any Warning that can Occur : NR Involved Components : Component Name 1 : Dana IADB (Integrated Air Disc Brake) D-Series ste Component Description : Dana IADB (Integrated Air Disc Brake) D-Series steer axle Component Part Number : B05-6041* Supplier Identification : Component Manufacturer Name : Dana, Inc Address : 3939 Technology Dr Maumee Ohio 43537 Country : United States Chronology : 8/10/2020: Safety & Compliance received notification of field failure 8/12/2020: Dana notified and requested parts to be sent to them 8/27/2020: Weekly meetings started with Dana 9/17/2020: First Dana bench test set up 9/25/2020: Issue discussed at NHTSA quarterly meeting 11/5/2020: Reviewed Dana bench testing and instrumented vehicle data 1/25/2021: Continued weekly reviews with Dana testing attempting to replicate field issues 2/3/2021: Update given to NHTSA during quarterly meeting 3/4/2021: Customer review list provided to Dana for inspections 3/26/2021: 1st customer Inspection completed with no issues found 4/20/2021: 2nd customer inspection completed, no issues found 5/20/2021: Revised Dana bench test set up reviewed 5/26/2021: Update given to NHTSA during quarterly meeting 6/3/2021: 3rd customer inspection completed, 118 truck inspected to date 6/24/2021: 4th & 5th customer inspections completed, 158 total inspections, no issues 7/8/2021: Dana took customer truck with previous failure for track instrumentation Part 573 Safety Recall Report 22V-277 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 8/12/2021: Non-failed knuckles returned from field to check bolt tension 9/3/2021: Update given to NHTSA during quarterly meeting 9/23/2021: Dana visited customer measured bolt tension and replaced bolts in 15 units 9/30/2021: Dana visited KW plant and measured many drag link angles 10/7/2021: Bench test suspended and to be reconfigured 12/9/2021: Bench test reconfigured and began running series of new tests 1/6/2022: 4 bench tests completed and 2 in progress 1/20/2022: RH turn testing suspended with high cycle count and no failures 2/17/2022: 7 LH tests complete and two in progress 3/3/2022: 12 LH tests completed and 1 in progress 3/16/2022: Update given to Joint Safety Committee 3/24/2022: Update given to NHTSA during quarterly meeting 3/31/2022: 17 LH tests completed and 2 in progress 4/14/2022: 29 LH tests completed including 5 E-series baseline tests and 1in progress. 4/18/2022: Joint Safety Committee determines a recall will be initiated Description of Remedy : Description of Remedy Program : The remedy program is under development. The 573 will be amended once a remedy has been developed and validated. How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Notification letters will be sent within 60 days Planned Dealer Notification Date : JUN 24, 2022 – JUN 24, 2022 Planned Owner Notification Date : JUN 24, 2022 – JUN 24, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-277 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : JUN 07, 2022 NHTSA Recall No. : 22V-277 Manufacturer Recall No. : 22 PBB and 22 KWB Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 17,641 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2018-2020 Kenworth T270, T370, T440, T470, T660, T680, T800, T880, W900 and W990 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Recall population corresponds to production during build months associated with failed axles, plus 3 months after last build date for a known failed axle. Production Dates : AUG 01, 2017 – MAY 31, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2018-2020 Peterbilt 330, 337, 348, 365, 367, 389, 520, 567, 579 Vehicle Type : Body Style : Power Train : NR Descriptive Information : Recall population corresponds to production in build months associated with failed axles, plus 3 months after last build date for a known failed axle. Production Dates : AUG 01, 2017 – MAY 31, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : The Dana D-Series axle steer arm fasteners, that attach the steer arm to the steering knuckle, may fail. Reported failures occurred during low speed maneuvering operations when steering forces are highest. FMVSS 1 : NR FMVSS 2 : NR Part 573 Safety Recall Report 22V-277 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Description of the Safety Risk : Failure of both fasteners can result in a loss of steering control, which could increase the risk of a crash or injury. Description of the Cause : The cause is under investigation Identification of Any Warning that can Occur : NR Involved Components : Component Name 1 : Dana IADB (Integrated Air Disc Brake) D-Series ste Component Description : Dana IADB (Integrated Air Disc Brake) D-Series steer axle Component Part Number : B05-6041* Supplier Identification : Component Manufacturer Name : Dana, Inc Address : 3939 Technology Dr Maumee Ohio 43537 Country : United States Chronology : 8/10/2020: Safety & Compliance received notification of field failure 8/12/2020: Dana notified and requested parts to be sent to them 8/27/2020: Weekly meetings started with Dana 9/17/2020: First Dana bench test set up 9/25/2020: Issue discussed at NHTSA quarterly meeting 11/5/2020: Reviewed Dana bench testing and instrumented vehicle data 1/25/2021: Continued weekly reviews with Dana testing attempting to replicate field issues 2/3/2021: Update given to NHTSA during quarterly meeting 3/4/2021: Customer review list provided to Dana for inspections 3/26/2021: 1st customer Inspection completed with no issues found 4/20/2021: 2nd customer inspection completed, no issues found 5/20/2021: Revised Dana bench test set up reviewed 5/26/2021: Update given to NHTSA during quarterly meeting 6/3/2021: 3rd customer inspection completed, 118 truck inspected to date 6/24/2021: 4th & 5th customer inspections completed, 158 total inspections, no issues 7/8/2021: Dana took customer truck with previous failure for track instrumentation Part 573 Safety Recall Report 22V-277 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 8/12/2021: Non-failed knuckles returned from field to check bolt tension 9/3/2021: Update given to NHTSA during quarterly meeting 9/23/2021: Dana visited customer measured bolt tension and replaced bolts in 15 units 9/30/2021: Dana visited KW plant and measured many drag link angles 10/7/2021: Bench test suspended and to be reconfigured 12/9/2021: Bench test reconfigured and began running series of new tests 1/6/2022: 4 bench tests completed and 2 in progress 1/20/2022: RH turn testing suspended with high cycle count and no failures 2/17/2022: 7 LH tests complete and two in progress 3/3/2022: 12 LH tests completed and 1 in progress 3/16/2022: Update given to Joint Safety Committee 3/24/2022: Update given to NHTSA during quarterly meeting 3/31/2022: 17 LH tests completed and 2 in progress 4/14/2022: 29 LH tests completed including 5 E-series baseline tests and 1in progress. 4/18/2022: Joint Safety Committee determines a recall will be initiated Description of Remedy : Description of Remedy Program : The remedy program is under development. The 573 will be amended once a remedy has been developed and validated. Once a remedy is identified, it will be made available free of charge to affected owners. Owners who incurred costs to obtain a remedy for the problem addressed by the recall in advance of receiving notification may seek reimbursement through the process outlined in the general reimbursement plan on file.” How Remedy Component Differs from Recalled Component : NR Identify How/When Recall Condition was Corrected in Production : NR Recall Schedule : Description of Recall Schedule : Notification letters will be sent within 60 days Planned Dealer Notification Date : JUN 24, 2022 – JUN 24, 2022 Planned Owner Notification Date : JUN 24, 2022 – JUN 24, 2022 * NR – Not Reported

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