Possible causes of noise when engaging reverse gear on an automatic transmission:
*Low transmission fluid level: Check the fluid level and add fluid if necessary.
*Old or dirty transmission fluid: Replace fluid according to manufacturer’s recommendations.
* Worn clutches: Slipping clutches can create noise. They can become worn due to excessive stress or improper maintenance.
*Damaged Reverse Drum: The drum may be damaged due to excessive pressure or manufacturing defects.
* Wear bands: The bands used to engage reverse gear may become worn and noisy.
* Shift position sensor problem: The sensor may not detect the shift position correctly, resulting in noise.
* Faulty Transmission Control Module (TCM): The TCM may not control shifting correctly, causing noise.
* Transmission Mechanical Damage: Internal components such as gears and bearings may become damaged and create noise.
Diagnosis and solution:
* Check the transmission fluid level.
* Replace transmission fluid if it is old or dirty.
* Scan for trouble codes that may indicate a specific problem.
*Consult a qualified mechanic for inspection and diagnosis.
* Repair or replace damaged components as needed.
*Update the transmission control module software (if necessary).