What does fault code TCM-05A3 mean?

Diagnostic fault code details for TCM-05A3 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-05A3 - Hydraulic pressure solenoid, clutch odd gears. Hydraulic pressure to low

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?

Hydraulic pressure on clutch 1 (odd gears) reads lower than requested. The transmission builds hydraulic pressure for both clutches using a hydraulic pump and solenoids. The cause may be a low oil level or one of several damaged parts, such as a pressure sensor, a temperature sensor or a valve.

Possible causes

Low oil level
Damaged pressure sensor
Damaged output stage, solenoid CSPS1
Solenoid CSMS1, for clutch pressure, is damaged
Damaged valve CSM1, which routes the pressure between clutch and gear shifting
Damaged temperature sensor

What you can do

1Read the fault codes, clear TCM-05A3 and drive the car to see whether the code returns
2Have a workshop check the transmission oil level, since a low level can cause this fault
3Have a workshop open the transmission control system and check the solenoid and the oil level
4If the fault cannot be found or fixed, a workshop must replace the mechatronic unit

Symptoms you may notice5

Malfunction Indicator Light (check engine) lit or behaving abnormally
Yellow warning symbol and text message in the display
Gear changes take too long to complete
Shifts too early, too late or too often
No automatic gear changes

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