What does fault code TCM-0488 mean?

Diagnostic fault code details for TCM-0488 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-0488 - Pressure sensor, clutch even gears. Signal 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 pressure sensor for the clutch for even gears gives too high a signal to the transmission control module (TCM). The sensor shows the pressure on the clutch, so a wrong value means the control module does not get the right information to control it. The cause may be a sensor wire short-circuited to supply voltage or a damaged sensor.

Possible causes

Pressure sensor short-circuited to supply voltage
Pressure sensor for the clutch for even gears is damaged

What you can do

1Read out the fault codes from the transmission control module and deal first with any codes that may share the same cause
2Use a multimeter to check that the wire to the pressure sensor for even gears has no contact with the battery's positive supply
3The fault points to a damaged pressure sensor or a fault at its connection; the mechatronic unit must then be replaced, which a workshop should do
4If the fault is inside the control module, it must be replaced, and a new module is delivered without software and must be programmed by a workshop

Symptoms you may notice5

Text window with yellow warning symbol and message
Gears shift hard or jerky, sometimes or all the time
No automatic gear changes
Gear changes take too long to complete, sometimes or all the time
Shifts occur too early, too late or too often, sometimes or all the time

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