2021 Peterbilt 337 recalls and problems
The 2021 Peterbilt 337 has 2 safety recalls. Recall repairs are free at any Peterbilt dealer.
Recalls may cover only some 2021 Peterbilt 337 vehicles. Check your VIN at NHTSA ↗ to see open recalls for your exact car.
2021 Peterbilt 337 recalls
Recall 24V-915: Electrical System, Service Brakes, Hydraulic
Problem: PACCAR Incorporated (PACCAR) is recalling certain 2021-2025 Peterbilt and Kenworth vehicles, equipped with Bendix EC80 Advanced Electronic Control Units (ECU). Please see the recall report for a complete list of models. Electrical noise and low signal to the power line carrier may cause the ECU to incorrectly process commands or stop functioning.
Risk: Safety systems that depend on the ECU (Automatic Traction Control, ABS, Electronic Stability Control, Active Cruise Control, and Collison Mitigation System) may not function properly or at all, increasing the risk of a crash.
Fix: Dealers will reprogram the ECU software, free of charge. Owner notification letters were mailed February 3, 2025. Owners may contact Kenworth's customer service at 1-425-828-5888 and Peterbilt's customer service at 1-940-591-4220. PACCAR's numbers for this recall are 24KWL and 24PBL.
Recall 21V-391: Fuel System, Diesel
Problem: PACCAR Incorporated (PACCAR) is recalling certain 2018-2021 Peterbilt 337, 348, 365, 367, 520, 567, Kenworth T270, T370, T440, T470, T800 and T880 vehicles. The sealing washer may not seat correctly in the pilot bore holes, allowing the high pressure fuel rail assembly to leak.
Risk: A fuel leak in the presence of an ignition source increases the risk of a fire.
Fix: Dealers will inspect the rail threads and fuel lines, and replace the rail as necessary, free of charge. Owners may contact PACCAR customer service at 1-425-828-5888 (Kenworth) or 1-940-591-4220 (Peterbilt). PACCAR's numbers for this recall are 21KWC and 21PBD.
Other Peterbilt 337 years
Frequently asked questions
Does the 2021 Peterbilt 337 have any recalls?
Yes — NHTSA lists 2 recalls for the 2021 Peterbilt 337: 24V-915 (electrical system, service brakes, hydraulic), 21V-391 (fuel system, diesel). Not every vehicle is affected, so check your VIN at nhtsa.gov/recalls.
Are Peterbilt recall repairs free?
Yes. Safety recall repairs are free at authorized Peterbilt dealers, whether you are the first owner or bought the car used.