Allison H 40 Ep Transmission, Allison H 50 Ep Transmission, model year 9999. Filed by Allison Transmission, Inc. and reported to NHTSA on 20 August 2018. 592 vehicles potentially affected.
What the notice says Allison Transmission, Inc. (Allison) is recalling certain H 50 EP, H 40 EP, H 50 Cert, and H 40 Cert Drive Units. The pressure switches on these Drive Units may fail, possibly resulting in a loss of drive.
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
What owners ask about this recall
- Which vehicles does recall 18E085 cover?
- Allison H 40 Ep Transmission, Allison H 50 Ep Transmission.
- What is wrong with them?
- Allison Transmission, Inc. (Allison) is recalling certain H 50 EP, H 40 EP, H 50 Cert, and H 40 Cert Drive Units. The pressure switches on these Drive Units may fail, possibly resulting in a loss of drive.
- What can happen if it is not put right?
- A loss of drive can disable the vehicle unexpectedly, increasing the risk of a crash.
- Is there a fix yet?
- Yes, and it is free. Allison will notify the vehicle manufacturers that purchased the affected transmissions, and dealers will replace the C1 and C2 pressure switches, free of charge. The recall began September 14, 2018. Owners may contact Allison customer service at 1-800-252-5283.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “A loss of drive can disable the vehicle unexpectedly, increasing the risk of a crash.”
affected
in the notice
caught
| Campaign | 18E085 |
|---|---|
| Filed by | Allison Transmission, Inc. |
| System at fault | Power Train:Automatic Transmission |
| Reported to NHTSA | 20 August 2018 |
| Model years | 9999-9999 |
| Vehicles named | ALLISON H 40 EP TRANSMISSION, ALLISON H 50 EP TRANSMISSION |
What the notice says today
The consequence
A loss of drive can disable the vehicle unexpectedly, increasing the risk of a crash.
The remedy
Allison will notify the vehicle manufacturers that purchased the affected transmissions, and dealers will replace the C1 and C2 pressure switches, free of charge. The recall began September 14, 2018. Owners may contact Allison customer service at 1-800-252-5283.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 816 notices in the record whose component field names power train. Across that group the median wait before owners were written to was 42 days.
Last checked . No change has been recorded in the wording.
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 18E085, wording as read on 16 September 2026. https://carsmultiverse.com/recall/18e085/
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 18E085 on 23 August 2026, they were:
- Defect summary
e1f28fd2 - Consequence
5c091545 - Remedy
c22a7de7
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 18E085 · how the whole register is watched
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