ALLISON ALLISON H 50 EP TRANSMISSION Recall
Check Your Product
According to the National Highway Traffic Safety Administration (NHTSA)
Product
ALLISON H 50 EP TRANSMISSION
Brand
ALLISON
Lot Codes / Batch Numbers
Not specified in NHTSA notice. Check official source for details.
Allison Transmission, Inc. is recalling certain ALLISON H 50 EP TRANSMISSION equipment due to power train:automatic transmission issues. A loss of drive can disable the vehicle unexpectedly, increasing the risk of a crash..
Summary derived from NHTSA notice
Reason for Recall
As stated by NHTSA
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.
Reported concern (NHTSA)
A loss of drive can disable the vehicle unexpectedly, increasing the risk of a crash.
Recommended Action
Per NHTSA guidance
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.
Verify this information on the official source
For complete details and official instructions, check the National Highway Traffic Safety Administration (NHTSA) directly.
View official NHTSA recall noticePage updated: Jan 10, 2026