BMW, Mercedes-Benz Warning Message
“Transmission Malfunction”
The transmission control module has detected a serious fault. The vehicle may lock into a single gear (limp mode) to prevent further damage. This warning demands immediate attention.
critical severity
Common Causes
- Mechatronic unit failure (BMW)
- Valve body solenoid failure
- Torque converter shudder or lockup fault
- Transmission fluid degradation or low level
- Speed sensor malfunction
Immediate Action
Stop driving if possible. If you must drive, stay under 30 mph in limp mode. Tow to shop if transmission slips or vehicle cannot move. Continuing to drive can cause catastrophic internal damage.
Typical Repair Cost
$3,000–$8,000+