Possible reasons for the automatic transmission crackling when shifting:
1. Low transmission fluid level
* Check the transmission fluid level and add it to the recommended level.
2. Dirty or degraded transmission fluid
* Fresh transmission fluid keeps the internal components of the transmission lubricated and cool.
* Replace transmission fluid and filter according to maintenance intervals.
3. Worn or damaged friction discs
* Friction discs transfer power from the engine to the transmission.
* Wear or damage to these discs may result in slipping or popping noises.
4. Problem with the torque converter
* The torque converter connects the engine to the transmission.
* Problems with the torque converter can cause rattling noises when shifting gears.
5. Faulty solenoid
* Solenoids control the flow of transmission fluid in the transmission.
*A faulty solenoid can cause irregular shifting and rattling noises.
6. Problem with the electronic control unit (ECU)
* The ECU controls the operation of the gearbox.
* A faulty ECU may result in incorrect gear shifting and rattling noises.
7. Worn engine or transmission mounts
* Worn mounts can allow the engine or transmission to move excessively, which can result in a clattering noise when shifting.
Troubleshooting steps:
* Check the level, condition and color of the transmission fluid.
* Replace transmission fluid and filter if necessary.
* Take the vehicle to a qualified mechanic for further diagnosis and repair.
Warning:
* Do not ignore automatic transmission chattering noises as this can lead to further damage and costly repairs.
* Drive your vehicle as carefully as possible to minimize damage.