22KWD – Transmission May Slip Into Unexptected Gear – 2022 Kenworth T180, 2021-2023 T280, 2022-2023 T380

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November 30, 2022 IMPORTANT SAFETY RECALL This notice applies to your vehicle; VIN: This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act. Subject: Safety Recall 22KWD – T180/T280/T380 Transmission Actuator Slip NHTSA Recall number 22V425 Dear Kenworth Customer, Kenworth Truck Company has decided that a defect which relates to motor vehicle safety exists in certain Model Year 2021-2023 T180, T280, and T380 chassis built from 06/17/2020 through 04/15/2022 equipped with Allison series 1000 or series 2000 automatic transmissions. Internal components of the transmission actuator may slip, causing the actuator to become miscalibrated. On affected vehicles, if the transmission actuator becomes miscalibrated, transmission may shift into an unexpected gear. This may increase the risk of a crash. Kenworth has initiated a recall to remedy the defect. Please contact your Kenworth dealer. To find your Kenworth dealer, please visit Dealer Locator at www.Kenworth.com. The transmission actuator will be removed and sent to the supplier for rework. Total truck down time could be 3 business days or more depending on shipping times and dealer scheduling. This repair will be performed at no charge to you. The problem is… The transmission actuator may slip causing the actuator to become miscalibrated and the transmission may shift into an unexpected gear. What your dealer will do… Dealers will remove the transmission actuator and send it to the supplier for rework, then install the reworked actuator. What you must do … Contact your Kenworth Dealer to schedule an appointment for repair. 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 Kenworth Customer Service using one of the following: Email: Kenworth.Campaigns@paccar.com with the bulletin number in the subject line or Mail: Kenworth Truck Company, P.O. Box 1000, Kirkland, WA 98083-1000, Attn: Customer Service Department or Phone: 425-828-5888 You may submit a complaint to the 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, if you believe that the manufacturer or dealer failed or was unable to remedy the defect without charge within a reasonable time following the earliest date upon which repair procedure and parts become available. 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 regret any inconvenience that this work may cause you and appreciate your cooperation in this matter. Thank yo u, Annick Hollingsworth Director of Service Platforms Kenworth Truck Company

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-425 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : PACCAR Incorporated Submission Date : JUN 15, 2022 NHTSA Recall No. : 22V-425 Manufacturer Recall No. : 22KWD and 22PBD Manufacturer Information : Manufacturer Name : PACCAR Incorporated Address : 777 106TH AVENUE NORTHEAST BELLEVUE WA 98004 Company phone : 940 591 4220 Population : Number of potentially involved : 402 Estimated percentage with defect : 1 % Vehicle Information : Vehicle 1 : 2022-2022 Kenworth T180 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The affected population consists of vehicles with the part numbers included in the affected population that were sold by Paccar prior to establishing a clean point in production. Production Dates : APR 22, 2021 – APR 22, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 2 : 2021-2023 Kenworth T280 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The affected population consists of vehicles with the part numbers included in the affected population that were sold by Paccar prior to establishing a clean point in production. Production Dates : JUN 17, 2020 – APR 15, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-425 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 3 : 2022-2023 Kenworth T380 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The affected population consists of vehicles with the part numbers included in the affected population that were sold by Paccar prior to establishing a clean point in production. Production Dates : JUL 29, 2021 – APR 07, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 4 : 2022-2023 Peterbilt Model 536 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The affected population consists of vehicles with the part numbers included in the affected population that were sold by Paccar prior to establishing a clean point in production. Production Dates : JAN 27, 2021 – APR 26, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 5 : 2022-2023 Peterbilt Model 537 Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The affected population consists of vehicles with the part numbers included in the affected population that were sold by Paccar prior to establishing a clean point in production. Production Dates : SEP 13, 2021 – APR 26, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : Internal components of the transmission actuator may slip, causing the actuator to become mis-calibrated. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : On affected vehicles, if the transmission actuator becomes mis-calibrated, transmission may shift into an unexpected gear. This may increase the risk of a crash. Description of the Cause : When the actuator is exposed to increased temperatures and a torque input, internal components may slip relative to each other. This causes the actuator to become mis-calibrated. Part 573 Safety Recall Report 22V-425 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Identification of Any Warning that can Occur : The driver may notice a mismatch in the gear selected by the driver and the current gear of the transmission displayed on the push button shifter inside the cab. Involved Components : Component Name 1 : Transmission Actuator Assembly Component Description : Transmission Actuator Assembly Component Part Number : CAN-ACT1001, CAN-ACT2001 Supplier Identification : Component Manufacturer Name : Curtiss-Wright Address : 14100 SW 72nd Ave Portland Oregon 97224 Country : United States Chronology : 05-17-22: Paccar Plant notified Safety & Compliance of potential issue with transmission actuators, per feedback from the supplier. 05-18-22: Meeting held with supplier, Supplier Quality and Safety & Compliance to discuss. Containment at plants is complete, and all affected trucks are on hold at Paccar plants per supplier’s recommendation. Review of inventory at Paccar Parts begins to quarantine all suspect inventory. Safety & Compliance opens investigation. 05-20-22: Short term corrective action proposed is to rework existing inventory to add a keyway to prevent relative motion between the ring gear and shaft. Validation plan is reviewed between the supplier and Paccar. 05-31-22: Short term corrective action passes preliminary validation testing. Parts procurement in process for rework. Reworked parts will have a green dot on the part identification label for traceability. 06-08-22: Internal team completes summary of investigation. Affected population firmed. 06-09-22: Safety committee meeting held. The committee concurs that a safety related defect exists and the affected population shall be recalled. Part 573 Safety Recall Report 22V-425 Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 Description of Remedy : Description of Remedy Program : Paccar will notify customers and dealers, and will replace the transmission actuator assembly. 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 : The remedy components will be reworked to add a key to secure internal components relative to each other and have a mark on the part label to indicate they have been reworked. Identify How/When Recall Condition was Corrected in Production : Transmission actuators used to build production parts will include a key to secure internal components relative to each other. All vehicles manufactured on or after April 17, 2022 will include the updated transmission actuators. Recall Schedule : Description of Recall Schedule : Customers will be notified within 60 days. Planned Dealer Notification Date : AUG 14, 2022 – AUG 14, 2022 Planned Owner Notification Date : AUG 14, 2022 – AUG 14, 2022 * NR – Not Reported

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