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Service bulletin 37-001

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10179371
Published by NHTSA2020-09-03
Manufacturer's number37-001
Manufacturer's date2020-08-26
NHTSA componentEQUIPMENT; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING

NHTSA's summary

Fix-As-Fail – The Master Switch Module (MSM) may lose dash switch memory and functionality when the battery disconnect switch is cycled. An improved MSM is available to resolve the issue.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Engine, Equipment and accessories

Vehicles listed
KENWORTH T6802017, 2018, 2019, 2020
KENWORTH T8802017, 2018, 2019, 2020
KENWORTH W9902019, 2020
PETERBILT 5672017, 2018
PETERBILT 5792017, 2018

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
21V00N0002021-12-29. ELECTRICAL SYSTEM:WIRING
21V9060002021-11-19. ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, AIR
20200902020-03-05. Electrical
20V1300002020-03-04. ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES
18V6570002018-09-21. ENGINE AND ENGINE COOLING:ENGINE:DIESEL
18V0920002018-02-02. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION (PRNDL)
20173742017-07-27. Electrical
17V4710002017-07-25. ELECTRICAL SYSTEM:WIRING:FUSES AND CIRCUIT BREAKERS; EXTERIOR LIGHTING
16V4260002016-06-10. ELECTRICAL SYSTEM:IGNITION:MODULE
20162892016-06-08. Engine

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
32-0142026-09-29. Service bulletin. This bulletin, the troubleshooting procedure, and the BMS Troubleshooting Checklist have been updated to show that the Autometer tool test results can be used in place of the Midtronics tool test results for fulfilling service and warranty requirements.
P0012026-09-29. Service bulletin. "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."
E3432026-09-23. Service bulletin. An exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
43-0882026-08-20. Service bulletin. The procedure has been updated to include additional steps for verifying the software level on the vehicle electronic control unit (VECU2) and digital display (DD). Steps have also been added to the PACCAR Common Rail Injection 2 (PCI2) software verification.
E3112026-07-30. Service bulletin. 105 chassis have been removed from the chassis list and unflagged in PRWS due to expiration of applicable warranty coverage. Total chassis population is 732.
43-0882026-07-23. Service bulletin. This optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and MX-13 engines. This update provides customers with additional time to service their trucks before a DEF-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance.
41-0292026-07-22. Service bulletin. Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson air filter housings.
E3112026-07-21. Service bulletin. The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to include the latest prognostics bulletin verbiage.
43-0882026-07-21. Service bulletin. "The software is not yet available. The bulletin will be updated when more information is available."
43-0882026-07-02. Service bulletin. "An optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR MX-11 and MX-13 engines. This update provides customers with additional time to service theirtrucks before a DEF-related derate occurs. The software is being offered to customers in alignment withrecently updated regulatory agency guidance."