What does fault code TCM-0551 mean?

Diagnostic fault code details for TCM-0551 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-0551 - System pressure solenoid driver. 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 solenoid LPS, which governs the system pressure in the transmission, is shorted to supply voltage. The solenoid sits in the transmission's mechatronic unit, and this fault means that unit must be replaced. The fault may also be caused by a damaged solenoid, a damaged 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-0551 and drive the car to see whether it comes back
2Have a workshop read the fault with diagnostic equipment. This fault normally means the mechatronic unit has to be replaced
3Have a workshop replace the mechatronic unit and confirm that the fault code does not return

Symptoms you may notice5

Malfunction Indicator Light (check engine) lit or behaving abnormally
Yellow warning symbol and text message in the display
The car may feel weak or lack power when pulling away from a standstill
Shifts hard or jerky
High idle speed

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