VOLVO
ECM-P120400 - Cylinder #4 Injector Circuit Open/Shorted. General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS80 (2007–), V70 (2008–)
Show models by year and engine (2)
What does this fault code mean?
According to the engine control module (ECM), the injection timing for cylinder 4 is wrong. The fourth digit of the code shows which of cylinders 1 to 4 is meant, and the code is set when the injection timing does not match what is expected.
Possible causes
- Contact resistance or oxidation in the connections
- Open circuit in the wiring
- Short circuit to supply voltage
- Damaged injector
What you can do
- 1Read the code and note that it applies to cylinder 4
- 2Check the connector to injector cylinder 4 for contact resistance and oxidation
- 3Use a multimeter to check that the wire to injector cylinder 4 is not broken and is not shorted to battery positive
- 4If you have a diagnostic tool: read the fault status for the code once the diagnosis is finished
- 5If you find no fault: have a workshop check the injector
Symptoms you may notice2
- Poor performance and lack of power while driving
- Text message and warning symbol in the display
What the fault can affect2
- Engine speed is limited
- The car goes into limp-home mode
General guidance for car owners. Diagnosis on the car can point to a different cause.