VOLVO
ECM-2C3D - Injector cyl 4. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS80 (1999–2006), XC90 (2003–)
Show models by year and engine (2)
What does this fault code mean?
The injector for cylinder 4 has a signal that is too low, which can be caused by the signal wire being shorted to ground or by a damaged injector.
Possible causes
- Signal wire to cylinder 4 shorted to ground
- The injector is damaged
What you can do
- 1Read and note the code, clear it and road test
- 2Inspect the cylinder 4 wire for chafing where it may have touched the body
- 3Use a multimeter to check that the signal wire to cylinder 4 has no contact with ground
- 4If you have a diagnostic tool: read the cylinder 4 signal in live data with the engine running and compare it with the other cylinders
- 5If the wire is intact but the fault remains, have a workshop check the cylinder 4 injector
Symptoms you may notice2
- The malfunction indicator lamp (MIL) is on
- The engine is not running on all cylinders
General guidance for car owners. Diagnosis on the car can point to a different cause.