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What are the symptoms of a faulty automatic transmission computer?

1 Answers

LouisLee

07/25/25 9:08am

When the automatic transmission computer malfunctions, in addition to difficulties in gear shifting, gear slipping, and gear locking, it may also cause the mixture to become too lean or too rich. A lean mixture can lead to ignition difficulties, weak driving, engine backfiring, etc., while a rich mixture can increase fuel consumption, incomplete combustion, and severe carbon buildup in cylinders and spark plugs. Below are specific symptoms of a faulty automatic transmission computer: 1. Difficulty in shifting gears: This mainly applies to manual transmission vehicles. When the driver finds it hard to shift gears after engaging first gear, whether upshifting or downshifting, it indicates a transmission problem, including insufficient or low-viscosity transmission fluid, clutch linkage issues, etc. 2. Gear slipping: In a normally functioning transmission, when the car is stationary, the gear should stay in the designated position or the computer-specified gear within a certain RPM range until the computer initiates a gear change. However, if the transmission gears slip automatically, the car may spontaneously shift from the drive gear to neutral. 3. Gear locking: This means entering protection mode. The transmission computer can detect faults after they occur. The more advanced the car, the stronger the computer's detection capability. In such cases, the computer locks the transmission in third or fourth gear to alert the owner to seek immediate repair. 4. Transmission damage: The secondary oxygen sensor fails to provide accurate data to the car's computer, leading to a mixture that is too lean or too rich. A lean mixture can cause ignition difficulties, weak driving, and engine backfiring, while a rich mixture can increase fuel consumption, incomplete combustion, and severe carbon buildup in cylinders and spark plugs. When this fault occurs, the engine warning light should illuminate. Once detected, it is recommended that the owner promptly visit a 4S shop for inspection and repair.

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