Causes of impacts when changing gears in an automatic transmission:
Mechanical problems:
* Worn or damaged friction discs
* Worn or broken teeth in gears
*Low or contaminated transmission fluid
* Damaged torque converter
Electrical problems:
* Faulty shift solenoids
* Gear selector position sensor
*Transmission Control Module (TCM)
Software problems:
* Incorrect software update
* Calibration problems
Other possible reasons:
* Worn engine or transmission mounts
*Low engine oil level
* Clogged fuel filter
* Faulty fuel injection system
Diagnosis and elimination:
To diagnose and eliminate shift shocks in an automatic transmission, follow these steps:
1. Checking the transmission fluid level and condition: Check the fluid level and inspect it for signs of contamination or a burning smell.
2. Scan for Trouble Codes: Use a dedicated scanner to read any trouble codes stored in the transmission control module.
3. Diagnose mechanical problems: Remove the transmission pan and inspect internal components such as friction plates, gear teeth and torque converter.
4. Electrical Inspection: Check the shift solenoids, shift position sensor, and transmission control module using a multimeter or oscilloscope.
5. Software Update: If necessary, update the powertrain control module software to the latest version.
6. Reset Adaptations: Reset the transmission adaptations to allow the system to relearn and compensate for component wear.
Prevention:
To prevent gear shift shock in an automatic transmission, follow these guidelines:
* Check and change transmission fluid regularly.
* Keep the engine and transmission in good condition.
* Avoid sudden acceleration and braking.
* Perform routine vehicle maintenance in accordance with the manufacturer’s recommendations.