21PBN – Methane Detection System May Fail – 2016-2022 Peterbilt

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PETERBILT MOTORS COMPANY A – COMPANY 1700 WOOOBROOK STREET DENTON, TEXAS 76205-7864 940-591-4000 Recall Notice: 21 PBN IMPORTANT SAFETY RECALL INFORMATION Issued in Accordance 0 With Federal Law ,u.s. o_.portPMn tot N**H**T*S. …A… :a m n ► T1 P1 r- 0001 r- ~ z ‘””” 0 –I n m February 11, 2022 IMPORTANT SAFETY RECALL Interim Notification Subject: Safety Recall: 21 PBN – LNG/CNG Methane Detection System Will Not Warn if System Loses Power NHTSA: 21V00N 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 Model 536, 567 and 579 LNG and CNG vehicles equipped with a methane detection system. The methane detection system may not function as designed and the driver may not be alerted if the methane detection system loses power. The driver could be unaware of an issue with the methane detection system, or excessive methane present, increasing the risk of a fire, crash and/or personal injury. What is the problem? What will your dealer do? What should you do? The driver may not be alerted by warning lamp and buzzer if the methane detection system loses power. When the repair procedure is available, your dealer will correct the methane detection system to function as designed. There is no action required on your part at this time. You will receive a letter notifying you when the repair is 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 becomes 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 Wood brook 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 if you know their name. 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, –wt.L?–/2- Michelle Ponsonby Director of Customer Service Peterbilt Motors Company Our records indicate that these vehicles are affected by 21 PBN and are owned by Scan this QR code to open the Peterbih Dealer Locator.

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<BULLETIN DRAFT> 21PBN / 21KWH Page 1 of 3 Methane Detection System Will Not Warn the Operator if the System Loses Power Author: Patrick Riley 8/12/2022 Title (metadata) 21PBN / 21KWH – LNG/CNG Methane Detection System Will Not Warn Operator if System Loses Power – NHTSA ID: 21V00N, TC: 2021-793 Bulletin No. 21PBN / 21KWH Description 21PBN / 21KWH – LNG/CNG Methane Detection System Will Not Warn Operator if System Loses Power Supplier Peterbilt / Kenworth Section Fuel – 44 What’s New Abstract Safety Recall – The methane detection system will not warn the operator if the system loses power. The driver could be unaware of an issue with the methane detection system or excessive methane present, increasing the risk of a fire, crash, or injury. Revision Introduction On certain LNG and CNG vehicles, the methane detection system may not function as designed. The driver may not be alerted by warning lamp and buzzer if the methane detection system loses power. Situation (Chassis Affected) PB-244 (241 US / 3 Canada) Model 536, 567 and 579 chassis model year 2016 through 2022 LNG and CNG vehicles built from 06/01/2015 through 11/30/2021 with a methane detection system. 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 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 “21PBN” (KW: 21KWH) campaign code prior to performing this repair. 3. Follow the procedures below to rework the methane detection wiring. Methane Detection System Will Not Warn the Operator if the System Loses Power 21PBN / 21KWH Page 2 of 3 4. Contact customer to schedule an appropriate repair date that coincides with parts availability. 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 or noncompliance has been corrected. Warranty PETERBILT WARRANTY STATEMENT There is no time or mileage limit for this recall. Peterbilt will pay for parts at dealer net plus applicable mark up and labor: • 1.8 hours labor to rework the methane detection wiring. Use Quick Claim Code 21PBN. • There is no time or mileage limit for this recall. Peterbilt will pay for parts at dealer net plus applicable mark up and labor: • File an additional claim for extraordinary circumstances. A quick claim for standard labor must be filed first. • File the claim within 14 days in accordance with Warranty Policy. Take-Off Parts Disposition: PRWS CLAIM CODING Campaign Code: 21PBN (21KWH) Campaign Type Safety Recall Claim Category: Truck Repair Type Proactive Customer Concern Code 029 Causal Code A1 Corrective Action Code 12 Responsibility Code: Camp Failure Location 051-006-014 Causal Part 18138 Supplier Code N/A SRT Code B21-PBN – 1.8 hours for methane detection rework. Methane Detection System Will Not Warn the Operator if the System Loses Power 21PBN / 21KWH Page 3 of 3 Display in SIR Always Visible Editable by dealer? Yes KW AutoPay No PB AutoPay No Parts Parts are available from PACCAR Parts. Quantity Part Number Description 1 S92-1250-1000 HARNESS – SPARE POWER OPT 1 S92-6694 METHANE DETECTION REWORK HARNESS Background Procedure Please follow your dealership’s safety procedures and precautions to ensure the vehicle can be safely repaired and maintained. Locate the appropriate rework procedure in the Links section. Links Model 567 / 579 Rework Procedure Model 536 Rework Procedure Chassis List US Customer Letter Canada Customer Letter – English Canada Customer Letter – French Channels KWUS ☐ KWCA☐ KWGS☐ PBUS☒ PBCA☒ Same bulletin published to KW & PB regions? Choose an item. Publish On Click or tap to enter a date. Standard Repair Time Process Documentation SRT SRT Time Actual Time Time Study Date Model B21-PBN 1.8 1.76 11/23/2021 579 Re-install in Reverse Order Methane Detection Rework ©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 Methane Detection Rework Harness S92-1250-1000 Methane detection rework harness S92-6694 Standard Repair Time Process Documentation Methane Detection Rework Step 1: Disconnect power to cab: Step 2: Remove Lower panels on LH side (5 screws) (2 connectors) Step 3: Remove Fire extinguisher Standard Repair Time Process Documentation Methane Detection Rework Step 4: Remove LH door sill plate (4 screws) Step 5: Remove LH front handle (3 bolts) Step 6: Remove LH foot rest (2 screws) Standard Repair Time Process Documentation Methane Detection Rework Step 7: Remove zip ties securing harness Step 8: Gently pull harness out of the wat and remove P004 connector (brown) Step 9: Locate and cut wire RED 3311-9 Standard Repair Time Process Documentation Methane Detection Rework NOTE: The secondary lock must be released in order to add a wire terminal to the connector. See photo: Step 10: Add terminal to wire red3311-9 and re-locate to position B4 See photo, orange wire: Step 11: Remove 4 firewall pass-through connectors: NOTE: Must be removed from outside. Standard Repair Time Process Documentation Methane Detection Rework NOTE: The secondary lock is released by sliding the yellow tab towards the pins until it clicks. Be sure to lock the secondary lock after replacing wires. The disconnected wires must be cut, then insulated with tape or heat shrink tubing Step 12: Replace pin 25 in connector P099 (brown) with RED0731-17 on the rework harness: Step 13: Replace pin 17 in connector P006 (gray) with RED 0731-10 on the rework harness: Standard Repair Time Process Documentation Methane Detection Rework Step 14: locate spare power connector (tied back near the firewall pass through connectors) and plug in harness S92-1250-1000 Step 15: Plug the rework harness into terminal P04B Spare batt 1 Step 16: Remove the C,B panels and dash cluster, then locate the methane detection alarm (located behind the dash cluster) Standard Repair Time Process Documentation Methane Detection Rework Step 17: Re-pin alarm connector power wire with the rework harness, then insulate the unused cable and secure the alarm in its original position. Step 18: Move the 15 Amp fuse in location B6 to M6, then insert 5Amp fuses in locations B6 and G10 Note: location G10 may be populated with a 20Amp fuse from the factory, replace it with the 5Amp fuse Step 19: Re-assemble all components, secure all harnesses with zip ties, then re-supply power to the cab. Standard Repair Time Process Documentation Methane Detection Rework Step 20: Correct the fuse labels on the fuse label : B6-Methane detect (5A) M- PACCAR AMT (15A) G10-Methane Detect (5A) Step 21: Verify functionality by removing the 5Amp fuse in location B6. The methane detection alarm should sound.

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21PBN – LNG/CNG Methane Detection System Will Not Warn Operator if System Loses Power – NHTSA ID: 21V00N, TC: 2021-793 Number 21PBN Supplier Peterbilt Description t1 Edit [D Clone 21PBN – LNG/CNG Methane Detection System Will Not Warn Operator if System Loses Power- NHTSA ID: 21V00N, TC: 2021-793 Date 1/7/2022 What’s New Safety Recall – Methane detection system will not warn the operator if the system loses power. The driver could be unaware of an issue with the methane detection system or excessive methane present, increasing the risk of a fire, crash and/or personal injury. The repair procedure will be added when it is available. Introduction On certain LNG and CNG vehicles, the methane detection system may not function as designed. The driver may not be alerted by warning lamp and buzzer if the methane detection system loses power. Situation 244 (241 US/ 3 Canada) Model 536, 567 and 579 chassis model year 2016 through 2022 LNG and CNG vehicles built from 06/01/2015 through 11/30/2021 with a methane detection system. Resolution Safety Recall This bulletin will be updated when the repair procedure is available. 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 or noncompliance has been corrected. Links Chassis List Interim US Customer Letter Interim Canada Customer Letter – English Interim Canada Customer Letter – French Authored by: PR Revision History 01/18/2022 -Added the Transport Canada number and attached the Interim Customer Letters and the Chassis List

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 21V-00N The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : AUG 24, 2022 NHTSA Recall No. : 21V-00N Manufacturer Recall No. : 21KWH and 21PBN Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 1,107 Estimated percentage with defect : NR Vehicle Information : Vehicle 1 : 2016-2022 Peterbilt 567 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Peterbilt 1.9m vehicles have a different design and are not affected. Production Dates : JUN 01, 2015 – MAY 07, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2016-2022 Peterbilt 579 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Peterbilt 1.9m vehicles have a different design and are not affected Production Dates : OCT 26, 2015 – NOV 30, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 3 : 2021-2022 Peterbilt 536 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Peterbilt 1.9m vehicles have a different design and are not affected Production Dates : AUG 21, 2020 – NOV 30, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 21V-00N Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 4 : 2021-2021 Kenworth T280 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : AUG 07, 2020 – AUG 07, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 5 : 2016-2022 Kenworth T680 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : FEB 17, 2015 – MAY 21, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 6 : 2018-2020 Kenworth T440 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : OCT 03, 2017 – APR 26, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 7 : 2020-2020 Kenworth T270 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : APR 16, 2019 – APR 16, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 8 : 2017-2021 Kenworth T880 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : APR 22, 2016 – SEP 04, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 21V-00N Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : Methane detection system will not warn if system loses power FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Absent a warning by the methane detection system, the operator may not be aware of a system malfunction or of the presence of excessive levels of methane gas, which can lead to an increased risk of fire or injury. Description of the Cause : The methane detection warning alarm and warning lamp share the same fuse. Absent a redundant power source, the warning lamp and the warning alarm will not operate to produce constant warning sound and light when the methane detection system loses power. Identification of Any Warning that can Occur : A faint small may indicate the presence of excessive levels of methane gas in CNG trucks Involved Components : Component Name 1 : Methane Detection System Component Description : Methane Detection System consists of an assembly of sensors, gauge, warning buzzer and lamp Component Part Number : Assembly does not have part number, but PP607005 is part number for gauge Supplier Identification : Component Manufacturer Name : PACCAR Address : 777 106th Ave. NE Bellevue 98004 Country : NR Chronology : 11-11-2021: Peterbilt Safety and Compliance reviewed a natural gas truck and found the warning lamp and the warning alarm did not indicate constant warning sound and light when the methane detection system power was lost. Investigation opened. 11-12-2021: 50 trucks are on hold at the plants (48 PB and two (2) KW chassis) and being reworked for creating a redundant power source for warning lamp and buzzer. The field trucks may be reworked similar to the plant rework. Part 573 Safety Recall Report 21V-00N Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 11-19-2021: AELs (KW: 00301N5, PB: 031AHMD) are created as an additional method to identify future trucks with methane detection that may need an alternate design called out. 11-24-2021: Chillicothe confirms rework procedure effectively resolved the concern. Fuse B6 was pulled to simulate a loss of system power, causing the warning lamp to illuminate and alarm to sound. 12-07-2021: Affected population of vehicles in the field defined. 12-09-2021: Warranty Claims checked for this system and found none. 12-22-2021: Safety committee meeting held. The committee agrees that a defect relating to motor vehicle safety exists. Description of Remedy : Description of Remedy Program : PACCAR will notify customers and dealers will provide a redundant power source for the warning alarm and light by moving signal for the warning alarm from shared fuse to the battery splice block in the cab harnesses. 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 : In the remedy component, the circuit for alarm and lights are independent of each other, unlike the original shared fuse for both warnings. Identify How/When Recall Condition was Corrected in Production : Short term remedy for trucks at plant involved adding the spare power jumper. Long term correction involved moving signal for the warning alarm from shared fuse to the battery splice block in the cab harnesses. Recall Schedule : Description of Recall Schedule : Customers will be notified within 60 days Planned Dealer Notification Date : OCT 21, 2022 – OCT 21, 2022 Planned Owner Notification Date : OCT 21, 2022 – OCT 21, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 21V-00N The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : SEP 19, 2022 NHTSA Recall No. : 21V-00N Manufacturer Recall No. : 21KWH and 21PBN Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 1,107 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2016-2022 Peterbilt 567 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Peterbilt 1.9m vehicles have a different design and are not affected. Production Dates : JUN 01, 2015 – MAY 07, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2016-2022 Peterbilt 579 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Peterbilt 1.9m vehicles have a different design and are not affected Production Dates : OCT 26, 2015 – NOV 30, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 3 : 2021-2022 Peterbilt 536 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Peterbilt 1.9m vehicles have a different design and are not affected Production Dates : AUG 21, 2020 – NOV 30, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 21V-00N Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 4 : 2017-2021 Kenworth T880 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : APR 22, 2016 – SEP 04, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 5 : 2016-2022 Kenworth T680 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : FEB 17, 2015 – MAY 21, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 6 : 2018-2020 Kenworth T440 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : OCT 03, 2017 – APR 26, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 7 : 2020-2020 Kenworth T270 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : APR 16, 2019 – APR 16, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 8 : 2021-2021 Kenworth T280 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : AUG 07, 2020 – AUG 07, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 21V-00N Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : Methane detection system will not warn if system loses power FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Absent a warning by the methane detection system, the operator may not be aware of a system malfunction or of the presence of excessive levels of methane gas, which can lead to an increased risk of fire or injury. Description of the Cause : The methane detection warning alarm and warning lamp share the same fuse. Absent a redundant power source, the warning lamp and the warning alarm will not operate to produce constant warning sound and light when the methane detection system loses power. Identification of Any Warning that can Occur : A faint small may indicate the presence of excessive levels of methane gas in CNG trucks Involved Components : Component Name 1 : Methane Detection System Component Description : Methane Detection System consists of an assembly of sensors, gauge, warning buzzer and lamp Component Part Number : Assembly does not have part number, but PP607005 is part number for gauge Supplier Identification : Component Manufacturer Name : PACCAR Address : 777 106th Ave. NE Bellevue 98004 Country : NR Chronology : 11-11-2021: Peterbilt Safety and Compliance reviewed a natural gas truck and found the warning lamp and the warning alarm did not indicate constant warning sound and light when the methane detection system power was lost. Investigation opened. 11-12-2021: 50 trucks are on hold at the plants (48 PB and two (2) KW chassis) and being reworked for creating a redundant power source for warning lamp and buzzer. The field trucks may be reworked similar to the plant rework. Part 573 Safety Recall Report 21V-00N Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 11-19-2021: AELs (KW: 00301N5, PB: 031AHMD) are created as an additional method to identify future trucks with methane detection that may need an alternate design called out. 11-24-2021: Chillicothe confirms rework procedure effectively resolved the concern. Fuse B6 was pulled to simulate a loss of system power, causing the warning lamp to illuminate and alarm to sound. 12-07-2021: Affected population of vehicles in the field defined. 12-09-2021: Warranty Claims checked for this system and found none. 12-22-2021: Safety committee meeting held. The committee agrees that a defect relating to motor vehicle safety exists. Description of Remedy : Description of Remedy Program : PACCAR will notify customers and dealers will provide a redundant power source for the warning alarm and light by moving signal for the warning alarm from shared fuse to the battery splice block in the cab harnesses. 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 : In the remedy component, the circuit for alarm and lights are independent of each other, unlike the original shared fuse for both warnings. Identify How/When Recall Condition was Corrected in Production : Short term remedy for trucks at plant involved adding the spare power jumper. Long term correction involved moving signal for the warning alarm from shared fuse to the battery splice block in the cab harnesses. Recall Schedule : Description of Recall Schedule : Customers will be notified within 60 days Planned Dealer Notification Date : OCT 21, 2022 – OCT 21, 2022 Planned Owner Notification Date : OCT 21, 2022 – OCT 21, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 21V-00N The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : DEC 29, 2021 NHTSA Recall No. : 21V-00N Manufacturer Recall No. : 21KWH and 21PBN Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 1,107 Estimated percentage with defect : NR Vehicle Information : Vehicle 1 : 2016-2022 Peterbilt 567 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Peterbilt 1.9m vehicles have a different design and are not affected. Production Dates : JUN 01, 2015 – MAY 07, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2016-2022 Peterbilt 579 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Peterbilt 1.9m vehicles have a different design and are not affected Production Dates : OCT 26, 2015 – NOV 30, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 3 : 2021-2022 Peterbilt 536 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Peterbilt 1.9m vehicles have a different design and are not affected Production Dates : AUG 21, 2020 – NOV 30, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 21V-00N Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 4 : 2017-2021 Kenworth T880 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : APR 22, 2016 – SEP 04, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 5 : 2016-2022 Kenworth T680 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : FEB 17, 2015 – MAY 21, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 6 : 2018-2020 Kenworth T440 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : OCT 03, 2017 – APR 26, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 7 : 2020-2020 Kenworth T270 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : APR 16, 2019 – APR 16, 2019 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 8 : 2021-2021 Kenworth T280 Vehicle Type : Body Style : Power Train : NR Descriptive Information : LNG and CNG vehicles with a methane detection system. Production Dates : AUG 07, 2020 – AUG 07, 2020 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 21V-00N Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Defect : Description of the Defect : Methane detection system will not warn if system loses power FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Absent a warning by the methane detection system, the operator may not be aware of a system malfunction or of the presence of excessive levels of methane gas, which can lead to an increased risk of fire or injury. Description of the Cause : The methane detection warning alarm and warning lamp share the same fuse. Absent a redundant power source, the warning lamp and the warning alarm will not operate to produce constant warning sound and light when the methane detection system loses power. Identification of Any Warning that can Occur : A faint small may indicate the presence of excessive levels of methane gas in CNG trucks Involved Components : Component Name 1 : Methane Detection System Component Description : Methane Detection System consists of an assembly of sensors, gauge, warning buzzer and lamp Component Part Number : Assembly does not have part number, but PP607005 is part number for gauge Supplier Identification : Component Manufacturer Name : PACCAR Address : 777 106th Ave. NE Bellevue 98004 Country : NR Chronology : 11-11-2021: Peterbilt Safety and Compliance reviewed a natural gas truck and found the warning lamp and the warning alarm did not indicate constant warning sound and light when the methane detection system power was lost. Investigation opened. 11-12-2021: 50 trucks are on hold at the plants (48 PB and two (2) KW chassis) and being reworked for creating a redundant power source for warning lamp and buzzer. The field trucks may be reworked similar to the plant rework. Part 573 Safety Recall Report 21V-00N Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 11-19-2021: AELs (KW: 00301N5, PB: 031AHMD) are created as an additional method to identify future trucks with methane detection that may need an alternate design called out. 11-24-2021: Chillicothe confirms rework procedure effectively resolved the concern. Fuse B6 was pulled to simulate a loss of system power, causing the warning lamp to illuminate and alarm to sound. 12-07-2021: Affected population of vehicles in the field defined. 12-09-2021: Warranty Claims checked for this system and found none. 12-22-2021: Safety committee meeting held. The committee agrees that a defect relating to motor vehicle safety exists. Description of Remedy : Description of Remedy Program : PACCAR will notify customers and dealers will provide a redundant power source for the warning alarm and light by moving signal for the warning alarm from shared fuse to the battery splice block in the cab harnesses. 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 : In the remedy component, the circuit for alarm and lights are independent of each other, unlike the original shared fuse for both warnings. Identify How/When Recall Condition was Corrected in Production : Short term remedy for trucks at plant involved adding the spare power jumper. Long term correction involved moving signal for the warning alarm from shared fuse to the battery splice block in the cab harnesses. Recall Schedule : Description of Recall Schedule : Customers will be notified within 60 days Planned Dealer Notification Date : FEB 26, 2022 – FEB 26, 2022 Planned Owner Notification Date : FEB 26, 2022 – FEB 26, 2022 * NR – Not Reported

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