What are the reasons for an automatic transmission not shifting up?

1 Answers
OKiara
07/30/25 1:07am
Automatic transmission not shifting up is due to sensor failure or circuit failure. The following are the related contents of the fault: Sensor failure or circuit failure: Poor or improperly adjusted throttle position sensor or accelerator pedal position sensor. Faulty output shaft speed sensor or poor speed signal. Shift solenoid valve failure. Faulty gear position switch or overdrive switch. Faulty automatic transmission oil temperature sensor. Consequences of long-term lack of maintenance for automatic transmission: If the transmission oil is not replaced, the vehicle may experience weak starting when cold. The vehicle is prone to slight slipping and other phenomena during driving. Long-term failure to replace the transmission oil will cause the oil to thicken, which can easily block the transmission radiator, leading to excessively high transmission oil temperature and increased wear.
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