GM Transmission Problems 825

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Vehicle Owners report transmission problems with GM vehicles; Hard Shift-Vibration.

Hesitation – Shaking – Chevy Shake – Chevy Shudder

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 2019 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:
2015-2019 Chevrolet Silverado
2017-2019 Chevrolet Colorado
2015-2019 Chevrolet Corvette
2016-2019 Chevrolet Camaro
2015-2019 Cadillac Escalade and Escalade ESV
2016-2019 Cadillac ATS and ATS-V
2016-2019 Cadillac CTS and CTS-V
2016-2018 Cadillac CT6
2015-2019 GMC Sierra
2015-2019 GMC Yukon and Yukon XL
2015-2017 GMC Yukon Denali and Denali XL
2017-2019 GMC Canyon


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