VOLVO
ECM-P120412 - Cylinder #4 Injector Circuit Open/Shorted. General Electrical Failures. Circuit short to battery
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (8)
- Volvo S80 (2007–)2007–2009Engine D5244T4, D5244T5 only
- Volvo S80 (2007–)2010–2011Engine D4164T only
- Volvo V70 (2008–)2008–2009Engine D5244T4, D5244T5 only
- Volvo V70 (2008–)2010–2011Engine D4164T only
- Volvo XC60 (2009–)2009All engines except: B6304T2
- Volvo XC70 (2008–)2008All engines except: B6324S
- Volvo XC70 (2008–)2009Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2013–2014Engine D5244T18, D5244T5 only
What does this fault code mean?
The code for cylinder 4 is set when the signal to the injector is incorrect. The cause is a signal wire shorted to supply voltage, although a damaged injector can also be the reason.
Possible causes
- Signal wire shorted to supply voltage
- Damaged injector
What you can do
- 1Read and note the code, clear it and road test to see whether it returns
- 2With the engine control module connector disconnected, use a multimeter to check that the signal wire to cylinder 4 has no contact with battery positive
- 3Check the wire to cylinder 4 for chafing and pinching
- 4Look at the injector for cylinder 4 for damage
- 5If you find no fault: have a workshop check the injector
Symptoms you may notice2
- The engine does not start, or only gives a clicking sound when starting is attempted
- 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.