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Why does an automatic transmission car suddenly stop shifting up?

1 Answers

SanMadelyn

07/30/25 7:28am

Here are several reasons why an automatic transmission car may not shift up: 1. Improper adjustment of the throttle cable or throttle position sensor: Inspect and adjust the throttle cable and throttle position sensor to resolve the issue. 2. Faulty vehicle speed sensor: Check the vehicle speed sensor and replace it if necessary. 3. Sticking shift valve or faulty gear position switch: Inspect the gear position switch signal. If there are no faults in the control system, the automatic transmission should be disassembled for inspection. Additional information: Below is an introduction to automatic transmissions: 1. The automatic transmission must use the manufacturer-specified automatic transmission fluid. Do not mistakenly add manual transmission gear oil, differential-specific oil, or engine oil, as this can cause severe burning of all clutches and brakes after some time of driving. 2. The automatic transmission fluid should be replaced promptly. When changing the fluid, ensure the old fluid is completely drained. The fluid level must be strictly controlled. If the clutches or brakes are burned, the torque converter hydraulic system should be cleaned immediately. The hydraulic system has two oil inlet ports, one located at the bottom of the control valve body.

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