What does fault code TCM-0471 mean?

Diagnostic fault code details for TCM-0471 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-0471 - Inputshaft speed odd gears. Electronic sensor fault.

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 odd gears, which measures speed for gears 1, 3, 5 and reverse, is damaged. The transmission control module (TCM) therefore gets no usable speed signal from it. The sensor's signal is also used to check the other two speed sensors.

Possible causes

Damaged sensor
Damaged connector or dirty circuit board at the 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
2Check the connector at the sensor for the odd gears: see whether it is secure, clean and free from damage
3Use a multimeter to check that the wire to the sensor has no contact with ground (the car body)
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
5Clear the fault code and road test to see whether it returns

Symptoms you may notice5

Yellow warning symbol and message in the display
No forward or reverse movement with a gear selected
Gears shift hard or jerky, sometimes or all the time
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.