What does fault code TCM-046A mean?

Diagnostic fault code details for TCM-046A (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-046A - Clutch pressure correlation. Adapted engine torque to clutch torque outside allowed range

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 transmission control module (TCM) has found that the clutch torque it has calculated for the clutches does not match the engine torque. The transmission has two clutches, clutch 1 for odd gears and clutch 2 for even gears. The fault may come from an incorrect torque signal from the engine, but it may also be in the transmission.

Possible causes

Damaged clutch unit
Incorrect engine torque

What you can do

1Read out the fault codes from both the transmission and engine control modules and check whether fault code TCM-04A2 is set; trace it if so
2Check the engine control module first, since an engine fault that affects torque or the torque signal can cause this code
3Check whether the transmission control module has other fault codes that may have the same cause, for example for pressure sensors, speed sensors or the solenoids, and trace those first
4If the fault-tracing shows a fault in the transmission, it must be replaced; otherwise the clutch unit may be damaged and a workshop should replace it

Symptoms you may notice2

Gear changes take too long to complete, sometimes or all the time
Gears shift hard or jerky, sometimes or all the time

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