VOLVO
ECM-P029C68 - Cylinder 1 Balance - Injector Restricted. Algorithm Based Failures. Event information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsS80 (2007–), V70 (2008–), XC70 (2008–), XC90 (2003–)
What does this fault code mean?
This code is event-based and linked to an algorithm. The engine control module (ECM) compares the lambda values of the cylinders in bank 1, cylinders 1 to 3, and cannot even out the difference with individual cylinder lambda control, since the deviation is too large. The cause is mechanical and lies in the engine.
Possible causes
- Mechanical causes in the engine
What you can do
- 1There is no fault-tracing for this code; it is an event code that shows the control range has been used up
- 2Read and note the fault code, and clear it if needed
- 3Have a workshop with diagnostic equipment examine the mechanics of the engine for cylinders 1 to 3, for example the compression
Symptoms you may notice1
- No noticeable symptoms for the driver
What the fault can affect1
- Individual cylinder lambda control is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.