What does fault code TCM-047A mean?

Diagnostic fault code details for TCM-047A (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-047A - Tranmission speed sensors even gears. Plausible signal

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 input shaft speed sensor for even gears, which is part of the mechatronic unit, gives a signal outside the permitted range for the selected gear. The sensor value is used for shifting, to work out vehicle speed and to check the transmission's hydraulic and mechanical function.

Possible causes

Damaged sensor

What you can do

1Read out the fault codes from the transmission control module. If several speed sensors show faults, the cause may instead lie in the control module
2If you have diagnostic equipment, compare the input shaft speed for even gears with that for odd gears in live data while the car is rolling and see whether it deviates
3The sensor is part of the mechatronic unit, so if the sensor is at fault the mechatronic unit must be replaced, which a workshop should do
4If the fault is inside the control module, it must be replaced; 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
No automatic gear changes
Gear changes take too long to complete, sometimes or all the time
Gears shift hard or jerky, 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.