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Service bulletins for the 2019 Peterbilt 520

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.

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

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Bulletins, newest first
34-0872020-07-03. Service bulletin. ELECTRICAL SYSTEM. Non-Safety Campaign: Peterbilt has determined that certain RHSU model 520 trucks, built from 7/16/2018 to 3/20/2020, may have been equipped with a Main Cab Harness that enables the Door Alarm to sound when it should be disabled. Model 520 vehicles with this configuration should have the door alarm disabled when the passenger door is open and the vehicle is in drive mode.
11-0012020-06-02. Service bulletin. POWER TRAIN. Information only: Hendrickson Softek front axle maintenance intervals and requirements.
43-0662020-04-07. Service bulletin. STRUCTURE. DEF tank covers may become loose and potentially crack on vehicles built before October 2019 with DEF tank part number M86-6221-003**(TANK-DEF MEDIUM ASSY) and M86-6222-003**(TANK-DEF LARGE, ASSY). Resolution is to resolve the vibration on the tank cover by adding bottom tank washers.
20PBB2020-04-03. Service bulletin. SERVICE BRAKES, AIR:SUPPLY:QUICK RELEASE VALVE. Safety Recall: Peterbilt has decided that certain Model 320 and 520 trucks built between 2/20/2015 and 7/16/2019 may have been built without a quick release valve. The absence of this valve could affect rear brake timing on certain vehicles equipped with a tri-drive or liftable tag axle and Dual Seated or Right Hand Stand-Up steering configurations. Resolutoin is to inspect for a quick release valve installed, and if there is not one, to install a quick release valve.
32-0162020-04-03. Service bulletin. EQUIPMENT. Information Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment damage.
19PBF2020-02-05. Service bulletin. STEERING. Safety Related Campaign - Interim Notification: Peterbilt Motors Company has decided a defect, which relates to motor vehicle safety, may exist in certain Model 520 vehicles with Right Hand Stand Up (RHSU) configuration built between June 15, 2018 and February 14, 2019. Vehicles may have an improperly supported steering gear assist bracket due to the incorrect spring bracket installed. The spring bracket may be missing 3 drilled and tapped holes which will provide additional support for the steering gear assist bracket. An improperly supported steering gear assist bracket may flex or break and cause damage to other components or cause the steering to lock up. This bulletin will be updated as soon as parts become available for the repair.
03-0712020-01-04. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Information Only - Vehicles built with NAMUX software from 2013 to present may experience accuracy issues with the tachometer. The issue can be temporarily resolved using any one of the included procedures.
02-1532019-12-04. Service bulletin. STRUCTURE. Information only: Some model 320 and 520 vehicles built before 3/11/2019 may experience loss or loosening of doghouse insulation. Reference the procedure in the attachment section to properly remove and replace the insulation.
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.
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).
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.
19PBC2019-08-02. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. Safety Recall: Vehicles fail to confirm with FMVSS/CMVSS No 108 Table 1-a requirements which requires 2 red stop lamps. Vehicles were equipped with additional amber stop lamps which may illuminate when the brake is applied, and may confuse other drivers. Resolution is to remove the amber stop lamps and associated wiring.
34-0662019-07-08. Service bulletin. ELECTRICAL SYSTEM. Information Only - Quick Reference Guide for Electric harness damage repairs.
45-0612019-06-11. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS; EQUIPMENT ADAPTIVE/MOBILITY. Non-Safety Campaign: Identified Model 520 vehicles, equipped with natural gas engine, were built with a compressor supply hose with reinforced spring that could break loose and cause internal engine damage.
19PBB2019-06-10. Service bulletin. ELECTRICAL SYSTEM. Safety Recall: INTERIM NOTIFICATION - Peterbilt Motors Company has determined that a defect, which relates to motor vehicle safety, exists in certain model year 2017, 2018, 2019 and 2020 Model 520 vehicles manufactured between October 17, 2016 and March 04, 2019 with left hand or right hand single steer Power Distribution Center (PDC) harnesses. The power wire to the PDC may be inadequate and unable to accommodate the current draw. This can cause the wire to overheat and potentially melt the cab power harness connector. This could cause a loss of power to the cab and engine, which may result in the engine shutting down. A sudden loss of engine power could increase the risk of a crash.
34-0772019-05-13. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT:ELECTRICAL. Information Only: Proper instructions for closure of power distribution box cover to prevent corrosion.
34-0742019-05-13. Service bulletin. ELECTRICAL SYSTEM. Non Safety Campaign: Vehicles were built with a 5 bolt supply wire for the air dryer pressure sensor that is no longer required with current architecture. If left in place, a fault code P1644 may be set.

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