What does fault code ECM-P138E29 mean?

Diagnostic fault code details for ECM-P138E29 (Volvo C30 (2007–2013), Volvo S40 (2004–2013), Volvo S60 (2011–)). Repair service at OBD Tuning.

VOLVO

ECM-P138E29 - Turbocharger Boost Control Position Sensor A Minimum/Maximum Stop Performance. General Signal Failures. Signal signal invalid

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

9 models

C30 (2007–2013), S40 (2004–2013), S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V70 (2008–)

Show models by year and engine (9)

What does this fault code mean?

The code concerns the position sensor that senses the turbo guide vanes. It is the learned limit for the closed position that is outside what is permitted, and the engine control module (ECM) checks the limits with the engine running. The code can be a knock-on fault from another turbo fault, in which case that other code is worked on first. The cause can also be a damaged turbocharger.

Possible causes

Knock-on fault from a fault detected by another trouble code test for the turbo and/or turbo control
Troubleshoot according to another trouble code
Damaged turbocharger

What you can do

1Read all the codes and deal with the other turbo faults first, because this code may be a knock-on fault.
2Check that the connectors to the position sensor are secure and clean.
3If you have a diagnostic tool, read the position sensor value in live data while the turbo is controlled, and see whether the value changes smoothly.
4If the fault remains, have a workshop with diagnostic equipment check the turbocharger.

Symptoms you may notice1

Poor performance, the car lacks power

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