What are the faults of the automatic transmission control module?
2 Answers
Automatic transmission control module faults are as follows: 1. Delayed upshift of automatic transmission: When the car is running, the upshift speed is significantly higher than the standard value, and the engine speed before upshift is too high. The accelerator pedal must be used to advance the upshift (i.e., release the accelerator pedal for a few seconds and then press it again) to make the automatic transmission shift into a higher or high-speed gear. 2. Automatic transmission cannot upshift: The automatic transmission cannot shift into 2nd gear or high-speed gear while driving; the automatic transmission can shift into 2nd gear while driving, but cannot shift into 3rd gear or overdrive. 3. The car cannot move: Whether the shift control handle is in reverse gear or forward gear, the car cannot move; the car can move a short distance after starting, but cannot move after a slight warm-up.
I've been driving for over a decade, and automatic transmission control module failures are quite common with varied symptoms. The most frequent issue is rough shifting - like suddenly getting stuck in a certain gear during acceleration or experiencing jerky gear changes that make the car feel sluggish. The dashboard often lights up with warning indicators, such as the transmission light, signaling a problem. Potential causes include power surges, voltage instability, or module aging. Over time, wiring degradation or short circuits can also trigger failures. Sensor malfunctions, like a faulty speed sensor, prevent the module from correctly reading data to control gear shifts. Moisture or water infiltration can corrode wiring too. For prevention, I recommend regular maintenance to check battery and wiring seals, and avoid extreme driving. If a failure occurs, it's best to stop and inspect - forcing the car to drive could be dangerous, especially if the transmission locks up on the highway. Professional shops typically use diagnostic tools to read trouble codes and determine whether it's a module issue or something else. Repair costs vary - severe cases may require replacing the entire module.
