10L1000 transmission valve body failure
POWER TRAIN
14 NHTSA complaints · 2024-06-01 → 2026-07-27
“While driving, the 10l1000 transmission in the truck attempted to shift from 6th gear to 7th gear. The transmission locked up causing a violent "buck" from the rear end of the truck. The road was icy and could have caused the truck to lose control due to the lock up of the rear wheels…”
“The Allison 10‑speed (10L1000) transmission valve body catastrophically failed on [XXX], while driving Sunday afternoon down Galveston Seawall Blvd. The truck abruptly dropped from 45 mph into limp mode in heavy traffic, forcing me to pull into the bike lane to avoid being rear‑ended…”
“Truck has less than. 30k miles on it. Went into limp mode, was less than a mile from home. Parked it had it towed to nearest dealer. They then informed me they have 4 other truck sitting and waiting for Gm to fix parts with allison 10 speed transmission valve body…”