Possible causes of strong shocks when engaging a gear in an automatic transmission:
Mechanical problems:
* Faulty Clutch Friction Discs: Worn, damaged or oily clutch discs can cause slipping or sudden engagement, causing severe impacts.
* Damaged torque converter clutch: This device that links the engine and transmission can fail, causing vibrations and shocks.
* Worn Band Brakes: The bands or belts that stop the transmission shaft can become worn or weakened, causing shock.
* Dirty transmission fluid: Dirty or old fluid can cause components to slip or seize, causing knocks.
* Clogged Transmission Filter: A clogged transmission filter will restrict fluid flow, preventing the transmission from shifting smoothly.
Electrical problems:
* Faulty Solenoid: Solenoids control the flow of fluid through the automatic transmission, and a malfunctioning one can cause misshifting and knocking.
* Faulty Transmission Control Module (TCM): The TCM is responsible for the electronic control of the automatic transmission, and a malfunction can lead to problems with shifting gears.
* Faulty Speed Sensor: Inaccurate speed readings can prevent the TCM from shifting gears correctly, causing knocks.
Solutions:
To eliminate strong shocks when engaging a gear in an automatic transmission, you must contact a qualified mechanic for diagnosis and repair. Common solutions include:
* Replacement of faulty components such as friction discs, band brakes or torque converter clutch.
* Clean or replace dirty transmission fluid and filter.
* Replacement of faulty solenoids, TCM or speed sensors.
* TCM reprogramming or calibration to resolve shifting issues.