Allison Transmission 6th Gen Tcm, model year 9999. Filed by Allison Transmission, Inc. and reported to NHTSA on 24 July 2023. 584 vehicles potentially affected.
What the notice says Allison Transmission, Inc. (ATI) is recalling certain Emergency Vehicle Series 6th Generation Transmission Control Modules (TCM). The transmission control module (TCM) may fail to achieve the 4th gear transmission lockup needed to initiate the water pump.
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 23E056 cover?
- Allison Transmission 6Th Gen TCM.
- What is wrong with them?
- Allison Transmission, Inc. (ATI) is recalling certain Emergency Vehicle Series 6th Generation Transmission Control Modules (TCM). The transmission control module (TCM) may fail to achieve the 4th gear transmission lockup needed to initiate the water pump.
- What can happen if it is not put right?
- Failure to achieve 4th gear lock up may prevent the vehicle from achieving the full sequence needed to pump water, which can increase the risk of injury in an emergency.
- Is there a fix yet?
- Yes, and it is free. Vehicle manufacturers will update the TCM software, free of charge. ATI notified the affected vehicle manufacturers on July 31, 2023. Owners may contact ATI customer service at 1-317-242-5000.
- 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: “Failure to achieve 4th gear lock up may prevent the vehicle from achieving the full sequence needed to pump water, which can increase the risk of injury in an emergency.”
affected
in the notice
caught
| Campaign | 23E056 |
|---|---|
| Filed by | Allison Transmission, Inc. |
| System at fault | Power Train:Automatic Transmission:Control Module (TCM/PCM/Tecm) |
| Reported to NHTSA | 24 July 2023 |
| Model years | 9999-9999 |
| Vehicles named | ALLISON TRANSMISSION 6TH GEN TCM |
What the notice says today
The consequence
Failure to achieve 4th gear lock up may prevent the vehicle from achieving the full sequence needed to pump water, which can increase the risk of injury in an emergency.
The remedy
Vehicle manufacturers will update the TCM software, free of charge. ATI notified the affected vehicle manufacturers on July 31, 2023. Owners may contact ATI customer service at 1-317-242-5000.
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 23E056, wording as read on 16 September 2026. https://carsmultiverse.com/recall/23e056/
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.
Other Ati notices we hold
- 23E079: models B3400xFE_R and B400R, with part numbers B3400xFE_R and B400R
- 17E061: ProCharger Superchargers, model numbers AB037A-100, AB037A-100P, and A037A-100B, sold for installation on 2012-2017 Jeep Grand Cherokee SRT8 and SRT
All 3 Ati campaigns we hold · Every manufacturer in the record
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 23E056 on 23 August 2026, they were:
- Defect summary
1c71cd19 - Consequence
8589d8d9 - Remedy
cc934498
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 23E056 · how the whole register is watched
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