Hino warranty extension AB1Q0
Hino filed this with NHTSA as a warranty extension dated Apr 1, 2025, received Mar 6, 2025, about the engine — 2 documents under this number: 167-W2505-1, 167-W2503-1. It names 2 model years (2022–2023). A warranty extension 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 communicationCONVENTIONAL COOLANT LEVEL SENSOR – AB1Q0 Due to an internal malfunction of the Coolant level sensor, the MIL may be illuminated or the “Low coolant level� warning light may be illuminated intermittently with a “Low coolant� message on the instrument cluster regardless of the amount of coolant.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 167-W2505-1 | Warranty extension | Apr 1, 2025 | 11018102 | not yet checked |
| 167-W2503-1 | Warranty extension | Feb 25, 2025 | 11015168 | not yet checked |
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: 2022 Hino Conventional Models; 2023 Hino Conventional Models.
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.
Common questions
Source: NHTSA, 49 CFR 579.5Is Hino AB1Q0 a recall?
No. A warranty extension 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 AB1Q0 repair free?
A warranty extension 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 AB1Q0 cover?
The manufacturer filed it against 2 model years: 2022 Hino Conventional Models, 2023 Hino Conventional Models. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.