Possible reasons for the automatic transmission locking:
*Low transmission fluid level: Check the transmission fluid level and add fluid if necessary.
* Malfunctioning Solenoids: Solenoids control the flow of transmission fluid and can cause shifting problems.
* Worn Clutches: Clutches transfer torque from the engine to the transmission and can wear over time, causing slippage and lockup.
* Contaminated Transmission Fluid: Dirty or old transmission fluid can cause deposits to form that interfere with the performance of transmission parts.
* Faulty valve body: The valve body controls the flow of transmission fluid, and a faulty valve body can cause shifting problems.
* Sensor problems: Sensors monitor the transmission and can send incorrect data to the transmission control module (TCM), causing a lockup.
*Transmission Control Module Failure: The TCM controls the operation of the transmission and can fail, causing problems with shifting.
What to do if the automatic transmission is blocked:
*Check the transmission fluid level: Make sure it is within manufacturer specifications.
* Disconnect and reconnect the battery terminals: This may reset the vehicle’s electronic systems, including the TCM.
* Restart the engine: Sometimes restarting the engine can solve the locking problem.
*Have your car towed to a mechanic: If none of the above steps resolve the problem, seek professional help.
Cautions:
*Do not attempt to operate the vehicle if the automatic transmission is locked. Driving in this condition can cause further damage to the transmission.
* Do not tow a vehicle with a locked automatic transmission. This may damage the transmission.