What Causes the Car Not to Move When in Gear?

[MacRosalie]

Car not moving when in gear could be due to several reasons, such as leakage in the automatic transmission oil pan leading to loss of hydraulic fluid, loosening or detachment of the linkage or cable between the control lever and the manual valve rocker arm, the manual valve remaining in neutral or park position, clogging of the oil pump inlet filter screen, severe leakage in the main oil circuit, or damage to the oil pump. The following are the solutions: 1. Check for hydraulic fluid in the automatic transmission: Inspect the oil pan, hydraulic oil cooler, and oil pipes for any damage causing leakage. If severe leakage is found, repair and refill the hydraulic fluid. 2. Inspect the automatic transmission: Check the linkage or cable between the control lever and the manual valve rocker arm for any looseness or detachment. Tighten immediately if found loose. 3. Remove the plug from the main oil circuit pressure test port: Start the engine, shift the control lever to drive or reverse, and check if hydraulic fluid flows out from the test port. If fluid is observed, replace the engine promptly.