GM Transmission Problems
Chevrolet, GMC and Cadillac vehicle owners have reported transmission problems and defects.
Hard Shift – Vibration – Hesitation – Shaking are common problems with these vehicles.
August 2019 – GM Vehicle owners report the eight-speed automatic transmission found in several rear-wheel-drive Chevrolet, Cadillac and GMC models between the 2015 and 2022 model years has a defect that causes the vehicles to hesitate and jerk when accelerating or slowing down.
Problems with GM’s Hydra-Matic 8L90 and 8L45 transmissions have been well-documented on Internet forums and via complaints filed with the National Highway Traffic Safety Administration, with many reporting damage to their vehicles.
“These transmissions have a common defect,” a complaint reads. “Drivers attempting to accelerate or decelerate their cars feel a hesitation, followed by a significant shake, shudder, jerk, clunk, or ‘hard shift’ when the vehicle’s automatic transmission changes gears.” The problem also occurs when the vehicles accelerate in a single gear, without shifting, the plaintiffs allege. “Drivers have reported that the shift is sometimes so violent, they feel as though they have been hit by another vehicle.”
The problem is believed to center on the transmission, torque converter or both. The complaint says it causes undue friction, causing hydraulic systems and gears to function improperly and sometimes leaves metal shavings throughout the transmission, leading to costly repairs and replacement of parts or the entire transmission. It says GM has known about the problems since shortly after it introduced the transmissions, and has issued 13 technical service bulletins, none of which have resolved the problem.
The affected vehicles and model years are as follows:
- 2014-2022 — Chevrolet Silverado
- 2014-2022 — Chevrolet Colorado
- 2014-2022 — Chevrolet Corvette
- 2014-2022 — Chevrolet Camaro
- 2014-2022 — GMC Sierra
- 2014-2022 — GMC Yukon and XL
- 2014-2022 — GMC Yukon Denali and XL
- 2014-2022 — GMC Canyon
- 2014-2022 — Cadillac Escalade and ESV
- 2014-2019 — Cadillac ATS and ATS-V
- 2014-2019 — Cadillac CTS and CTS-V
- 2016-2020 — Cadillac CT6
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