What does fault code TCM-0550 mean?

Diagnostic fault code details for TCM-0550 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-0550 - System pressure solenoid driver. Open circut

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 system pressure solenoid LPS, which regulates the transmission's system pressure, has an open circuit. The solenoids sit in the transmission's mechatronic unit and control the hydraulics, including cooling of components and clutch pressure. The fault is caused by a damaged or dirty connector or circuit board, a damaged solenoid, or a damaged transmission control module.

Possible causes

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

What you can do

1Read the fault codes, clear TCM-0550 and drive the car to see whether it comes back
2Have a workshop open the transmission control system and inspect the solenoid and its contacts for corrosion, poor contact, dirt or metal build-up
3Have a workshop check the transmission oil level
4If the fault cannot be fixed, the mechatronic unit must be replaced. This is a job for a workshop

Symptoms you may notice4

Malfunction Indicator Light (check engine) lit or behaving abnormally
Shifts hard or jerky
Unusual noise from the transmission
High idle speed

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