What does fault code TCM-P060668 mean?

Diagnostic fault code details for TCM-P060668 (Volvo S60 (2011–), Volvo S80 (2007–), Volvo V40 (2013–)). Repair service at OBD Tuning.

VOLVO

TCM-P060668 - Control module processor. Algorithm Based Failures. Event information

System

Transmission Control Module (TCM)

Volvo models this fault code applies to

Applies to the following models:

9 models

S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)

Show models by year and engine (9)

What does this fault code mean?

This is an event-driven information code, and it does not point to a fault in the module where it is active. The transmission control module keeps checking the speed signals and the gearbox output speed, and during braking it checks that they agree. If a fault is found, the gearbox is disconnected into neutral, so that a wrong or locked gear cannot occur.

Possible causes

Break or short on the CAN wire running between the BCM and the transmission module, which may come and go
Damaged output speed sensor
Damaged wheel sensor
Internal fault in the transmission control module

What you can do

1Read the fault codes in the brake control module (BCM) and fix them first; then clear the fault code
2With the ignition off, check the CAN wire between the brake control module and the transmission control module for breaks, chafing and loose connectors
3Use a multimeter to check that the CAN wire is not shorted to ground or supply voltage
4Have a workshop check the output speed sensor and wheel sensors with diagnostic equipment, as they are part of the fault check
5Do not work on the brake system or the wheel sensors yourself; have a workshop carry out the troubleshooting there

Symptoms you may notice1

The automatic gearbox shifts harshly or jerkily

What the fault can affect1

The gearbox is disconnected into neutral

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