Possible causes of shocks when turning on the automatic transmission:
*Low Transmission Fluid: Leaks or low fluid levels can result in insufficient pressure to shift smoothly.
* Contaminated or degraded fluid: Over time, fluid can become contaminated or lose its lubricating properties, resulting in friction and impact.
* Worn or damaged transmission parts: Worn or damaged gears, bearings or other components can make it difficult to shift smoothly.
* Problems with the solenoids or hydraulic control unit: The solenoids and hydraulic control unit are responsible for transmitting pressure to the clutches, and their failure can lead to harsh shifts.
* Faulty Vehicle Speed Sensor: A faulty sensor can provide incorrect signals to the transmission control unit, resulting in incorrect gear shift timing.
* Clogged Transmission Filter: A clogged transmission filter can restrict fluid flow, resulting in reduced pressure and rougher shifting.
* Electrical Problems: Faulty electrical equipment or wiring may interfere with the operation of the solenoids or hydraulic control unit.
Solution:
* Check the fluid level and condition: Add fluid if the level is low and replace the fluid if it is dirty or degraded.
* Run a diagnostic: Use a diagnostic scan tool to identify possible trouble codes that may indicate a problem with specific components.
* Repair or replace damaged parts: Depending on diagnostic results, it may be necessary to repair or replace worn or damaged parts inside the transmission.
*Rebuild the hydraulic control unit: In some cases, rebuilding the hydraulic control unit may correct shifting problems.
* Replace solenoids: Faulty solenoids can be replaced.
* Clean the transmission filter: Remove and clean or replace the transmission filter if it is clogged.
* Inspect and repair electrical: Inspect electrical equipment and wiring for faults and repair as necessary.
If you experience shock when shifting gears in an automatic transmission, it is recommended that you take it to a qualified mechanic for proper diagnosis and repair. Failure to perform timely maintenance can result in further damage and costly repairs.