Kenworth service campaign 34-100
What it saysHalogen Headlamp Operation -Activating the Flash to Pass system on certain [Kenworth / Peterbilt] vehicles may cause one headlamp to deactivate. NHTSA’s full summary ↓
Kenworth filed this with NHTSA as a service campaign dated Mar 28, 2026, received Apr 7, 2026, about the exterior lighting. It names 4 model years (2026). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationHalogen Headlamp Operation -Activating the Flash to Pass system on certain [Kenworth / Peterbilt] vehicles may cause one headlamp to deactivate.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 34-100 | Service campaign | Mar 28, 2026 | 11030934 | PDF, 507 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themAlso filed against: 2026 Kenworth T380; 2026 Kenworth T680; 2026 Kenworth T880; 2026 Kenworth W990.
None of these model years has a page on this site (it covers EPA-certified cars, trucks and SUVs from 2016), so the bulletin is listed here on its own.
More bulletins about the exterior lighting
Source: same model, same component group1 other manufacturer communication filed against these Kenworth models under the same component group (exterior lighting), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 25PACF | Service campaign | Dec 23, 2025 | Procedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and Vehicle Electronic Control Unit (VECU)… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Kenworth, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Kenworth 34-100 a recall?
No. A service campaign is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls.
Is the 34-100 repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does 34-100 cover?
The manufacturer filed it against 4 model years: 2026 Kenworth T380, 2026 Kenworth T680, 2026 Kenworth T880, 2026 Kenworth W990. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.