What does fault code TCM-05A1 mean?

Diagnostic fault code details for TCM-05A1 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-05A1 - Hydraulic pressure solenoid driver, clutch odd gears. Voltage too high

System

Transmission Control Module (TCM)

Volvo models this fault code applies to

Applies to the following models:

4 models

C30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)

Show models by year and engine (10)

What does this fault code mean?

The output stage for solenoid CSPS1, which controls the hydraulic pressure over the clutch for the odd gears, is shorted to supply voltage. The fault means the mechatronic unit in the transmission must be replaced. The cause may also be a damaged solenoid, a damaged or dirty connector or circuit board, or a damaged transmission control module.

Possible causes

Damaged solenoid
Connector or circuit board damaged or dirty
Damaged transmission control module (TCM)

What you can do

1Read the fault codes, clear TCM-05A1 and drive the car to see whether it returns
2Have a workshop read the fault with diagnostic equipment. The fault requires the mechatronic unit to be replaced
3Have a workshop replace the mechatronic unit and confirm the fault code does not come back

Symptoms you may notice5

Yellow warning symbol and text message in the display
Shifts hard or jerky
No forward or reverse movement with a gear selected
Gear changes take too long to complete
Shifts too early, too late or too often

General guidance for car owners. Diagnosis on the car can point to a different cause.