Service bulletin 34-101
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.
| Type | Service bulletin |
|---|---|
| NHTSA id | 11033375 |
| Published by NHTSA | 2026-06-03 |
| Manufacturer's number | 34-101 |
| Manufacturer's date | 2026-05-19 |
| NHTSA component | EXTERIOR LIGHTING; ELECTRICAL SYSTEM |
NHTSA's summary
Certain Peterbilt Model 589 chassis equipped with LED headlamps may need a relay and fuses for the integrated heaters to be functional.
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, Lighting
| PETERBILT 589 | 2026 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 2025357 | 2025-06-26. Lights And Instruments |
|---|---|
| 25V436000 | 2025-06-26. EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE |
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| E328 | 2026-09-23. 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. |
|---|---|
| 01-094 | 2026-09-23. Service bulletin. [SmartAir / KIMS] A/C systems may shut down prematurely when voltage levels drop below a certain threshold. |
| 43-089 | 2026-07-22. 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. |
| 32-009 | 2026-07-21. 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. |
| 31-002 | 2026-07-21. Service bulletin. An installation guide is now available for temporary solar battery maintainers used on vehicles in dealer inventory. Using solar battery maintainers according to the attached guide can reduce instances of dead or undercharged batteries in stock vehicles at dealerships. Use of solar maintainers is considered a best practice for battery maintenance. |
| 02-177 | 2026-06-03. Service bulletin. Troubleshooting procedures for 2.1m cab power windows are now available. |
| E326 | 2026-05-06. Emissions. EPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX engines. |
| 25PACF | 2026-01-06. Service bulletin. Parts and procedures are now available for all affected chassis equipped with Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013 / Q21-1157-002-002 / Q21-1157-004-004 / Q21-1157-006-006 / Q21-1157-009-009. See attached Parts Matrix for required parts per chassis. |
| 25PACF | 2025-09-03. Service campaign. Procedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013. Parts and procedures for Phase 2 chassis will be available at a later date. This bulletin will be updated at that time. Please refer to the condition section for more details. Certain Ethernet Multiplexed Architecture (EMUX) chassis fail to conform to Federal and Canada Motor Vehicle Safety Standards (FMVSS/CMVSS) No. 108. Delayed or unsteady illumination of the vehicle’s stop lamps, reverse lamps, turn signal lamps and inadvertent change in headlamp illumination or lift axle position may" |