WenmarOpen by Wenmar Pro

Service bulletins for the 2026 Kenworth W990

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.

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

By type

By component

By topic

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
01-0942026-09-23. Service bulletin. ELECTRICAL SYSTEM; UNKNOWN OR OTHER. [SmartAir / KIMS] A/C systems may shut down prematurely when voltage levels drop below a certain threshold.
43-0892026-07-22. Service bulletin. ENGINE; ELECTRICAL SYSTEM. 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. ELECTRICAL SYSTEM. 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.
31-0022026-07-21. Service bulletin. ELECTRICAL SYSTEM. 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.
R26012026-06-04. Service bulletin. ELECTRICAL SYSTEM. Updated primary and/or secondary chassis modules for certain pre-production Kenworth chassis are now available for installation.
02-1772026-06-03. Service bulletin. ELECTRICAL SYSTEM. Troubleshooting procedures for 2.1m cab power windows are now available.
E3262026-05-06. Emissions. ENGINE; ELECTRICAL SYSTEM. EPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX engines.

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