Possible causes of engine jerking when shifting automatic transmission gears:
Mechanical problems:
*Low transmission fluid: Insufficient fluid levels can cause slipping and hesitation.
* Contaminated or old transmission fluid: Contamination and old fluid can cause shifting problems.
* Worn friction linings: Worn clutches can slip, causing jerking.
* Faulty solenoids: Electronic solenoids control the flow of fluid in the transmission. A faulty solenoid can result in incorrect gear shifting.
*Worn bearings: Worn bearings can create noise and vibration when shifting gears.
Electrical problems:
* Faulty Speed Sensor: A faulty sensor cannot correctly detect the vehicle’s speed, resulting in incorrect gear shifting.
*Wiring problems: Damaged wires or connectors can interrupt signals between the transmission ECU and other components.
* Faulty Transmission Control Module (TCM): The TCM controls the operation of the transmission. A faulty TCM can cause shifting problems.
Other possible reasons:
* Worn spark plugs or ignition wires: A poor spark can cause jerking and slipping.
* Clogged Fuel Filter: A dirty filter can restrict fuel flow, leading to shifting problems.
* Engine Problems: Engine problems such as low compression or a faulty crankshaft position sensor can also affect automatic transmission performance.
What to do:
* Check the level and condition of the transmission fluid.
* Send the car to a car service center for diagnostics.
* Be alert for any other symptoms such as noise, vibration or delay when shifting gears. This information can help a mechanic diagnose the problem.