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Why Doesn't the Car Move When in Gear?

1 Answers

SanMila

07/29/25 11:02pm

Reasons for an automatic transmission not moving when in gear include: leakage in the automatic transmission oil pan; loosened linkage or cable between the control lever and the manual valve rocker arm, keeping the manual valve in neutral or park position; clogged oil pump intake filter screen; severe leakage in the main oil circuit; or damage to the oil pump. Fault diagnosis and solutions: If a large amount of hydraulic oil sprays out from the pressure test hole, it indicates normal main oil circuit pressure, and the fault lies in the input shaft, planetary gear set, or output shaft of the automatic transmission, which should be disassembled for inspection. Check the linkage or cable between the automatic transmission control lever and the manual valve rocker arm for looseness. If loose, it should be reinstalled and the control lever position readjusted. If only a small amount of hydraulic oil flows out from the main oil circuit pressure test hole, with low or almost no oil pressure, open the oil pan to check if the oil pump intake filter screen is clogged. If not clogged, it indicates damage to the oil pump or severe leakage in the main oil circuit, requiring disassembly and inspection of the automatic transmission. Remove the plug from the main oil circuit pressure test hole, start the engine, shift the control lever to drive or reverse, and check for hydraulic oil flow from the test hole. If there is some oil pressure during a cold start but a significant drop when the engine is warm, it indicates excessive wear of the oil pump, which should be replaced.

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