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What are the reasons for an automatic transmission not moving when engaged?

1 Answers

CalebFitz

07/30/25 2:22am

Automatic transmission not moving when engaged is caused by leakage in the automatic transmission oil pan, looseness in the linkage or cable between the manual valve operating handle and the rocker arm, or blockage in the oil pump inlet filter screen. Leakage in the automatic transmission oil pan: If only a small amount of hydraulic oil flows out from the pressure measuring hole of the main oil circuit, and the oil pressure is very low or almost nonexistent, it indicates leakage in the automatic transmission oil pan, causing the vehicle not to move. Open the oil pan and check if the oil pump inlet filter screen is blocked. If there is no blockage, it means the oil pump is damaged or there is severe leakage in the main oil circuit, and the automatic transmission should be disassembled. Looseness in the linkage or cable between the manual valve operating handle and the rocker arm: If the linkage or cable between the manual valve operating handle and the rocker arm is loose, the manual valve remains in the neutral or parking position. If it is loose, reassemble it and readjust the position of the operating lever. Blockage in the oil pump inlet filter screen: If there is some oil pressure in the main oil circuit when starting the cold engine, but the oil pressure drops significantly after the engine warms up, it indicates excessive wear in the oil pump, and the oil pump should be replaced.

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