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What are the symptoms of a faulty automatic transmission computer?

1 Answers

DeIsaac

07/30/25 9:53am

Here are specific manifestations of a malfunctioning automatic transmission computer: Difficulty in shifting gears: After engaging first gear, pressing the clutch fails to shift gears properly, whether upshifting or downshifting. Gear slipping: In a normally functioning transmission, when the vehicle is stationary, the gear should remain in the designated position or the computer-specified gear within a certain RPM range until the computer initiates a gear change. However, with gear slipping, the vehicle can spontaneously jump out of the drive gear into neutral. Gear lock: The transmission enters protection mode. The computer can detect faults in the transmission. The more advanced the vehicle, 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 repairs. Transmission damage: The secondary oxygen sensor will fail to provide accurate data to the vehicle's computer, leading to either excessively lean or rich fuel mixture. A lean mixture can cause ignition difficulties, weak driving performance, engine backfiring, etc., while a rich mixture increases fuel consumption, incomplete combustion, and severe carbon deposits in cylinders and spark plugs. When this fault occurs, the engine warning light should illuminate, and immediate inspection and repair are necessary once detected.

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