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Service bulletins for the 2020 Peterbilt 337

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

31 on file from NHTSA, as of 2026-10-19.

By type

By component

By topic

Bulletins, newest first
01-0752019-12-04. Service bulletin. ENGINE AND ENGINE COOLING. Information Only: This bulletin provides guidance for repairing an air-conditioning system after internal failure of the A/C compressor.
PB 13-0502019-10-04. Service bulletin. SERVICE BRAKES, AIR. Information: Chassis built after 01/11/2016 with hydraulic brakes were provided with a jumper harness in the glove box or tool box that is required when programming the ABS. If this harness is no longer in the vehicle, order from PACCAR Parts.
TIB43-0622019-10-04. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. Information Only – This bulletin provides information about the California Air Resources Board (CARB) Periodic Smoke Inspection Program (PSIP) and Heavy Duty Vehicle Inspection Program (HDVIP).
19PBD2019-09-05. Service bulletin. STEERING:COLUMN; STEERING. Safety Recall: Defectective lower hsaft to u-joint yoke in non-telescoping steering columns due to supplier weld not creating enough penetration and can crack, which could lead to a loss of steering and increase risk of crash or injury. Resolution is to inspect for defective identified manufacturing lot and replace steering column if determined defective.
42-0562019-09-05. Service bulletin. ENGINE AND ENGINE COOLING. Fix-As-Fail -“ Composite fittings used in the cooling system may crack, resulting in coolant leaks. Brass fittings are available to replace the composite fittings.
42-0582019-09-05. Service bulletin. ENGINE AND ENGINE COOLING. Fix-As-Fail: Two separate causes have been identified as root cause of intermittent low coolant indicator illumination.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.