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Service bulletin R2601

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 id11033387
Published by NHTSA2026-06-04
Manufacturer's numberR2601
Manufacturer's date2026-05-29
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

Updated primary and/or secondary chassis modules for certain pre-production Kenworth chassis are now available for installation.

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

Vehicles listed
KENWORTH T3802023, 2024, 2025, 2026
KENWORTH T6802023, 2024, 2025, 2026
KENWORTH T8802023, 2024, 2025, 2026
KENWORTH W9902023, 2024, 2025, 2026
PETERBILT 5672022, 2023, 2024, 2025, 2026
PETERBILT 5792022, 2023, 2024, 2025, 2026

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

Recalls for the same vehicles and component
25V5690002025-09-02. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
25V1810002025-03-24. ELECTRICAL SYSTEM:PROPULSION SYSTEM
25V0410002025-01-29. EXTERIOR LIGHTING:HAZARD FLASHING WARNING LIGHTS:SWITCH; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE
24V9150002024-12-09. ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
20233432023-06-13. Electrical
23V4230002023-06-13. ELECTRICAL SYSTEM
22V7790002022-10-17. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
21V00N0002021-12-29. ELECTRICAL SYSTEM:WIRING
21V9060002021-11-19. ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, AIR

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.
E3282026-09-23. Service campaign. Certain chassis with CARB 2024 compliant MX-13 engines must have the PEU wiring harnesses updated. The original wiring and fuse are insufficient for electrical system operation and protection.
01-0942026-09-23. Service bulletin. [SmartAir / KIMS] A/C systems may shut down prematurely when voltage levels drop below a certain threshold.
P0032026-08-25. Service bulletin. The PB chassis list has been updated to include 1 chassis. The total chassis count is now 9.
P0032026-08-20. Service bulletin. "For Peterbilt: Chassis list has been updated to include 1 chassis. The total chassis count is now 7. For Kenworth: Chassis list has been updated to include 1 chassis. The total chassis count is now 8."
P0012026-08-20. Service bulletin. Chassis list has been updated to include 10 chassis. The total chassis count is now 101.
46-0292026-08-20. Service bulletin. When DAVIE version 26.21.2 is used to update the VECU3 to software version 3.4.46.0, the VECU3 5071 component group may display as --- after programming.
46-0202026-07-23. Service bulletin. Certain unaffected chassis have been removed from the chassis population.
43-0892026-07-22. Service bulletin. An optional software update is expected to be available on or after 07/31/26 for chassis equipped with EPA 2024 engine model year (EMY) 2024-2026 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.
32-0092026-07-21. Service bulletin. The battery care, maintenance, and charging guidelines have been updated to include Absorbent Glass Mat (AGM) battery information. Dealers are responsible for maintaining inventory trucks and on-shelf batteries.