Shocks when shifting gears in an automatic transmission can occur for several reasons:
Mechanical problems:
* Worn clutches: When worn, the clutches in the transmission can slip, causing vibrations.
* Faulty torque converter: The torque converter converts engine power into the torque needed to propel the vehicle. If it is faulty, it can cause jerks when shifting gears.
* Contaminated or poor quality transmission fluid: Transmission fluid lubricates and cools the transmission mechanisms. Contaminated or poor quality fluid can cause friction and shock.
* Faulty sensors: Sensors in the transmission provide information about gear shift speed and position. Faulty sensors can cause gears to shift incorrectly, causing jerks.
Electrical problems:
* Faulty Shift Solenoid: Shift solenoids control gear shifting. A faulty solenoid can cause incorrect or delayed shifting, causing jerking.
* Open or short circuit in the wiring: The transmission electrical system is responsible for controlling its components. An open or short circuit can cause components to malfunction, causing shocks.
Software problems:
* Faulty Transmission Control Module (TCM): The TCM monitors transmission operation. A faulty TCM can cause gears to shift incorrectly, causing jerking.
* Reprogramming needed: Sometimes transmission software updates can resolve shifting and jerking issues.
Other reasons:
* Cold Engine: Transmission fluid thickens when cold, which can result in more noticeable shifting noise.
* Excessive load: Towing heavy loads or driving off-road can cause the transmission to overheat and cause vibrations.
* Improper Maintenance: Regular maintenance, including transmission fluid and filter changes, is critical to keeping your transmission healthy.