Possible causes of vibration when turning on the automatic transmission in a Volvo:
* Torque converter malfunction:
* Worn or damaged turbine or pump blades
* Transmission fluid contamination or leakage
* Faulty bearings or o-rings
* Transmission fluid problems:
*Low fluid level
* Contaminated or degraded fluid
* Wrong fluid type
*Transmission control module (TCM) malfunction:
* Electrical problems or software glitches
* Faulty sensors
* Wear or damage to rubber fastenings:
* Loose or broken engine or transmission mounts
* Worn bushings or pads
* Problems with the driveshaft:
* Incorrect alignment
* Damaged hinges
*Differential problems:
* Worn or damaged gears
* Faulty bearings
* Other mechanical problems:
* Worn bearings or gears in the transmission itself
* Faulty clutches
* Flywheel wear
Diagnosis and elimination:
* Check the level and condition of the transmission fluid.
*Connect a diagnostic scan tool to identify trouble codes.
* Check engine and transmission mounts.
* Inspect the driveshaft.
* Have the transmission internally diagnosed by a specialist.
Precautions:
*Do not ignore vibration as it may cause further damage to the transmission.
* Take your vehicle to a mechanic at the first sign of vibration.
*Change transmission fluid and filters regularly according to manufacturer’s recommendations.