VOLVO
ECM-P120329 - Cylinder #3 Injector Circuit Open/Shorted. General Signal Failures. Signal signal invalid
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?
The code for cylinder 3 is set when the engine control module (ECM) sees that the signal to the injector does not match what is expected, for example when it is too high or too low.
Possible causes
- Contact resistance or oxidation in the connections
- Short circuit or open circuit on the wires to the injector
What you can do
- 1Read and note the code, clear it and road test to see whether it returns
- 2Check the connectors at injector cylinder 3 for contact resistance and oxidation
- 3Inspect the wires to cylinder 3 for chafing, breaks and pinching
- 4If you have a diagnostic tool: activate injector cylinder 3 and check that it operates
- 5If you find no fault: have a workshop check the injector
Symptoms you may notice2
- The engine does not start, either occasionally or all the time
- Poor performance and lack of power while driving
What the fault can affect1
- Injection stops
General guidance for car owners. Diagnosis on the car can point to a different cause.