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Transmission won't shift
Posted to HD/Fleet Forum on 7/30/2025

Group, This truck is here for unrelated work but now in our shop it won't shift . Allison 2000 series trans We have a flashing service light on the shift control but no active codes. I am using TEXA to scan Any advice appreciated Login to read more.

 

car Vehicle Data

2021 Peterbilt 337 6.7L

VIN 2NP2HM6X1N
Engine6.7 L

car Vehicle Data

2021 Peterbilt 337 6.7L

VIN 2NP2HM6X1N
Engine6.7 L