Hino warranty extension AB1Q0
What it saysAB1Q0 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… NHTSA’s full summary ↓
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.
One of the 432 warranty extensions and special-coverage programs on file — every make, with the term each runs to.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 167-W2505-1 | Warranty extension | Apr 1, 2025 | 11018102 | PDF, 94 KB |
| 167-W2503-1 | Warranty extension | Feb 25, 2025 | 11015168 | PDF, 179 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: 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.
More bulletins about the engine
Source: same model, same component group1 other manufacturer communication filed against the Hino Conventional Models under the same component group (engine), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| M0480 | Service campaign | Apr 10, 2025 | Subject vehicles contain a radiator mount vibration isolator that may have been manufactured using a surface coating that may cause the iso… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Hino, by the number printed on the letter.
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.