Allison: equipment recalls

NHTSA lists 6 equipment recall campaigns for Allison. NHTSA received the reports from 1991 to 2020. The campaigns have 5,437 units in total. The newest campaign is 20E049000. NHTSA received the report on 17 Jul 2020.

NHTSA recall lookup

The defect, the consequence and the remedy on this page are the summaries in the NHTSA recall file. The file names the manufacturer that filed each recall report.

NHTSA recall file through 29 Sep 2026.

Recall campaigns

6 campaigns, newest first. 5,437 units in total.

20E049000Received 17 Jul 2020. 262 units.
Power Train / Automatic Transmission
Defect, in the NHTSA record
Allison Transmission, Inc. (ATI) is recalling certain Drive Units: H 50 EP (part numbers 29540673 and 29540900), H 40 EP (part numbers 29540697 and 29549708), H 50 EP Cert (part numbers 29556925 and 29556926), and H 40 EP Cert Drive (part numbers 29557038 and 29557036). The pressure switches on these Drive Units may fail, possibly resulting in a loss of drive.
Consequence, in the NHTSA record
A loss of drive can disable the vehicle unexpectedly, increasing the risk of a crash.
Remedy, in the NHTSA record
ATI will notify the manufacturers that purchased the affected equipment, and ATI dealers will replace the C1 and C2 pressure switches in the affected drive units free of charge. The recall began August 10, 2020. Owners may contact ATI customer service at 1-317-242-5000.
Products named: Allison H 40 EP Transmission; Allison H 50 EP Transmission.
Report filed by Allison Transmission, Inc.. Owner notification date in the NHTSA record: 10 Aug 2020.
18E085000Received 20 Aug 2018. 592 units.
Power Train / Automatic Transmission
Defect, in the NHTSA record
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.
Consequence, in the NHTSA record
A loss of drive can disable the vehicle unexpectedly, increasing the risk of a crash.
Remedy, in the NHTSA record
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.
Products named: Allison H 50 EP Transmission; Allison H 40 EP Transmission.
Report filed by Allison Transmission, Inc.. Owner notification date in the NHTSA record: 14 Sep 2018.
02E018000Received 18 Mar 2002. 28 units.
Power Train / Manual Transmission / Shift Pattern Indicator
Defect, in the NHTSA record
Equipment description: the "check transmission" light in certain allison md world transmissions, a division of the general motors corporation, was incorrectly calibrated into the electronic control unit (ECU). These transmission were installed on certain international ngv 4000 / 7000 series trucks. The "check transmission" light indicates to the driver that the transmission is not fully operational, and that it should be repaired immediately. In those instances that the "check transmission" light would normally be illuminated as a result of a problem that prevents direction changes (such as shift selector malfunction) the driver may not be adequately aware of the problem.
Consequence, in the NHTSA record
The driver may inadvertently have the vehicle move in a director opposite to his intention which could result in a vehicle crash, possibly resulting in serious injury.
Remedy, in the NHTSA record
Allison will notify its customers and recalibrate the transmission ECU free of charge. Owner notification began march 15, 2002. Owners who take their vehicles to an authorized dealer on an agreed upon service date and do not receive the free remedy within a reasonable time should contact allison customer assistance center at 800-524-2303.
Products named: Allison Transmission.
Report filed by ALLISON DIV., GM CORP..
00E043000Received 28 Jul 2000. 640 units.
Power Train / Automatic Transmission
Defect, in the NHTSA record
Equipment description: allison transmission 1000 and 2400 series manufactured between march 1 and april 30, 2000. These automatic transmissions can experience park pawl to rear cover interference due to an out of flatness condition.
Consequence, in the NHTSA record
This could cause non-engagement of the park pawl when the transmission shift selector is moved to the park position. This could result in unintended vehicle movement and a vehicle crash without prior warning.
Remedy, in the NHTSA record
Dealers will remove the transmission from the vehicle, replace the park pawl, and reinstall the transmission in the vehicle.
Products named: Allison Transmission.
Report filed by GENERAL MOTORS CORP.. Owner notification date in the NHTSA record: 14 Aug 2000.
95E033000Received 8 Aug 1995. 665 units.
Power Train / Automatic Transmission
Defect, in the NHTSA record
The transmission reverse switches can cause the backup lights to be inoperative. This does not conform to the requirements of FMVSS no. 108, "lamps, reflective devices, and associated equipment."
Remedy, in the NHTSA record
Dealers will inspect the reverse pressure switch to determine the type of switch installed in the vehicle and replace those switches identified as being suspect.
Products named: Allison Transmission.
Report filed by GENERAL MOTORS CORP..
91E029000Received 12 Aug 1991. 3,250 units.
Power Train / Automatic Transmission / Park/Neutral Start Interlock Switch
Defect, in the NHTSA record
An incorrect neutral start switch was installed on some transmissions which allows the truck to be started in a drive position.
Consequence, in the NHTSA record
If vehicle engine is started with the transmissionselector in a drive position without service or parking brakes applied, thevehicle will move as soon as the engine starts and could result in a vehiclecrash without prior warning.
Remedy, in the NHTSA record
Replace the neutral start switch if determined that the incorrect type of switch was installed.
Products named: Allison Transmission.
Report filed by GENERAL MOTORS CORP.. Owner notification date in the NHTSA record: 1 Sep 1991.

The campaign number opens the NHTSA record.

Recall campaign: One recall in the NHTSA recall file, with one campaign number. A campaign can name many makes, models and model years.

Units: The number of vehicles or products that a recall can include. The manufacturer or the firm reports the number to the agency.

Counts

Allison equipment campaigns, by the year NHTSA received the report. The largest year is 1991, with 1 campaign.

Products in the campaigns

The product names in the NHTSA file.

Transmission4
H 40 EP Transmission2
H 50 EP Transmission2

Official channels

NHTSA recall lookupNHTSA shows the recalls of a child seat, a tire or equipment by brand and model.
NHTSA: report a safety problemThe NHTSA form for a complaint about a vehicle, a tire, a child seat or equipment.

Cite this page

Recall Register. Allison: equipment recalls. https://recallregister.com/equipment/other/allison/. Source: NHTSA Office of Defects Investigation, recall files. Data through 29 Sep 2026.

Sources

Source: NHTSA Office of Defects Investigation
Licence: US government work, public domain
Recall file through: 29 Sep 2026

Manufacturers in the recall file: GENERAL MOTORS CORP.; Allison Transmission, Inc.; ALLISON DIV., GM CORP..

The brand is the make that NHTSA records for the campaign. A campaign that names 2 brands is on the page of each brand. How the register is made. Report an error.

Questions

Which Allison products do the campaigns name?: The NHTSA records have 3 product names for these campaigns. The name in the most campaigns is: Transmission
How many units does a Allison equipment campaign have?: The median Allison campaign has 640 units. The median of all 2,866 equipment campaigns is 1,677 units.
Which component do the Allison campaigns name most often?: Power Train, in 6 campaigns. The component is the first component in the NHTSA record of a campaign.