No complaints are listed for the 2021 Peterbilt 337. NHTSA's API and bulk file list none in this build.
Data build 2026-10-08.
NHTSA lists this vehicle as PETERBILT 337.
Model-generated complaint tags: No complaints are listed for tagging.
Recalls
See new recalls and investigations this week.
2 recalls.
Date: 2024-12-09. Systems: ELECTRICAL SYSTEM, SERVICE BRAKES, HYDRAULIC.
Defect: 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.
Consequence: 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.
Remedy: 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.
Do not drive: No. Park outside: No.
Date: 2021-05-26. Systems: FUEL SYSTEM, DIESEL.
Defect: 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.
Consequence: A fuel leak in the presence of an ignition source increases the risk of a fire.
Remedy: 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.
Do not drive: No. Park outside: No.
Manufacturer communications
22 manufacturer communications.
Communications by system| System | Count |
|---|
| EQUIPMENT | 5 |
|---|
| ELECTRICAL SYSTEM | 3 |
|---|
| ENGINE AND ENGINE COOLING | 3 |
|---|
| EQUIPMENT ADAPTIVE/MOBILITY | 3 |
|---|
| ENGINE | 2 |
|---|
| FORWARD COLLISION AVOIDANCE | 2 |
|---|
| SERVICE BRAKES, AIR | 2 |
|---|
| STEERING | 2 |
|---|
11037541
Date: 2026-09-11. Type: Service Bulletin/Repair Instructions. Systems: ENGINE.
"Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes. 2 chassis added to the chassis list. Peterbilt: Dealers should check the chassis list and SIR weekly for VIN changes. 10 chassis added to the chassis list."
11036291
Date: 2026-08-13. Type: Service Bulletin/Repair Instructions. Systems: FORWARD COLLISION AVOIDANCE.
The verbiage in the Introduction section has been updated.
11013775
Date: 2025-01-10. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM, FORWARD COLLISION AVOIDANCE, UNKNOWN OR OTHER.
Safety Recall Updated software and procedures are now available. Certain Vehicle Model Year 2021-2025 Peterbilt chassis configured for trailer towing require a software update for the Bendix EC80 ABS ECU. Software update procedures for certain Battery-Electric Vehicles (BEV) and EC80 ABS ECU part nu
11010926
Date: 2024-11-22. Type: Service Bulletin/Repair Instructions. Systems: ENGINE.
Info Only Unnecessary starter replacements can result from customer complaints regarding engine starting issues. A new Starter Troubleshooting Guide has been created to provide a comprehensive list of starting system checks, which should reduce unnecessary starter replacements and associated warran
11005516
Date: 2024-07-30. Type: Service Bulletin/Repair Instructions. Systems: SUSPENSION.
Fix As Fail The height control valve (HCV) rod on vehicles with low air leaf suspensions is prone to toggling over center during rough road conditions. With full suspension articulation, HCV bracket flexes and toggles over center the HCV linkage, which results in either deflated airbags or makes th
10251175
Date: 2024-02-14. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM, STEERING.
Peterbilt has determined that certain model year 2021, pre-production chassis are eligible to have specific parts updated to production level.
10225578
Date: 2022-10-18. Type: Service Bulletin/Repair Instructions. Systems: ENGINE AND ENGINE COOLING.
Info Only - PACCAR is introducing Over-the-Air (OTA) software updates for engine MY17 and newer chassis equipped with Cummins X15, X12, ISX12, ISX12N, L9N, PX-7, and PX-9 engines The technology will leverage the existing Remote Diagnostic cs hardware to deliver secure software updates remotely. This
10222269
Date: 2022-09-09. Type: Service Bulletin/Repair Instructions. Systems: SUSPENSION.
Fix-As-Fail On certain chassis with Low Air Leaf Suspension or Low-Low Air Leaf Suspension, the Height Control Valve (HCV) arm may be rubbing on other components when the bend in the arm is facing outboard. Flipping the bend in the HCV arm inboard prevents the rub.
10219235
Date: 2022-08-03. Type: Service Bulletin/Repair Instructions. Systems: SERVICE BRAKES.
The service information for Bendix Air Dryer maintenance is being updated to include new procedures.
10209699
Date: 2022-03-03. Type: Service Bulletin/Repair Instructions. Systems: EQUIPMENT, EQUIPMENT ADAPTIVE/MOBILITY, SERVICE BRAKES, AIR, SERVICE BRAKES, HYDRAULIC.
Fix-As-FailA A A?A A A hill start assist (HSA) valve plumbing revision eliminates ice buildup in the HSA valve exhaust in cold weather.A A