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What Are the Common Problems with GM Transmissions?

2 Answers

McKiara

07/24/25 7:16am

Common problems with GM transmissions include: transmission fluid leaks, unusual noises from the transmission, and jerking sensations during acceleration. The transmission mainly refers to the vehicle's gearbox, which is divided into manual and automatic types. A manual transmission primarily consists of gears and shafts, achieving speed and torque changes through different gear combinations. An automatic transmission (AT) is composed of a torque converter, planetary gears, a hydraulic torque variation system, and a hydraulic control system. The main functions of the transmission are: 1. Changing the gear ratio to expand the range of torque and speed variations of the driving wheels to adapt to frequently changing driving conditions, while allowing the engine to operate under favorable conditions; 2. Enabling the vehicle to reverse while keeping the engine's rotation direction unchanged; 3. Using neutral to interrupt power transmission, allowing the engine to start, shift gears, and facilitating gear changes or power output.

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MacNadia

08/11/25 3:01am

I've heard that GM transmissions have quite a few common issues. Having driven over a dozen GM vehicles, I found most problems occur with the 6-speed automatic transmission. Shuddering is the most frequent symptom, especially during low-speed gear shifts where it jerks noticeably, making driving quite uncomfortable. The root cause often lies in faulty solenoid valves, leading to delayed or erratic shifting. Aging control modules are another pitfall, sometimes causing sudden downshifts and acceleration, which can be dangerous. CVT models frequently experience belt issues – when the belt breaks, the transmission locks up, resulting in costly repairs. Models like the Malibu or Equinox are particularly prone to these problems, with overheating being the main culprit, so regular fluid changes and cooling system maintenance are crucial. My advice: always check maintenance records when buying used, and opt for models with robust cooling systems to avoid major headaches.

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