2021 Peterbilt 337 problems

Verdict · NHTSA data

Limited data — recalls on file

NHTSA has just 0 complaints on file for the 2021 Peterbilt 337 — too few to judge reliability from owner reports alone — but 2 recall campaigns apply to this year, so any used example should have its VIN checked for completed recall work.

NHTSA complaints

Recalls

Investigations

Crash-involved

Fires reported

Injuries

Deaths

—

NCAP overall

How does 2021 compare to other 337 years?

337 NHTSA complaints by model year, 2021 highlighted. Red bars are years to avoid.

See all 337 years to avoid →

Does the 2021 Peterbilt 337 have recalls?

2 NHTSA recall campaigns on file. Recall repairs are free at franchised dealers.

24V915000Electrical SystemDecember 9, 2024 · 220,764 units

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.

21V391000Fuel SystemMay 26, 2021 · 612 units

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.

2021 Peterbilt 337 — common questions

Is the 2021 Peterbilt 337 reliable?

The record is thin — 0 NHTSA complaints — so owner-report data can't strongly confirm reliability either way, though 2 recalls should be verified as completed.

Does the 2021 Peterbilt 337 have recalls?

Yes — NHTSA lists 2 recall campaigns affecting the 2021 Peterbilt 337. Recall repairs are free at franchised dealers; check the VIN at nhtsa.gov/recalls to confirm the work was done.

Based on NHTSA ODI data through June 2026. Complaints are consumer-reported and unverified. Updated July 5, 2026.

Compiled by Sharon Ben-Moshe, Founder.

How does 2021 compare to other 337 years?

Does the 2021 Peterbilt 337 have recalls?

2021 Peterbilt 337 — common questions

Is the 2021 Peterbilt 337 reliable?

Does the 2021 Peterbilt 337 have recalls?

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