VOLVO
ECM-P035800 - Ignition coil H, primary/secondary circuit. General fault information. Type of fault not specified.
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS80 (2007–), XC90 (2003–)
Show models by year and engine (2)
What does this fault code mean?
The code applies to ignition coil H, which is the coil for cylinder 8. It does not say which type of fault it is. The engine control module checks the coil's signal through a separate diagnostic line.
Possible causes
- Contact resistance and oxidation at the coil connector
- Signal wire short circuit to ground or supply voltage
- Open circuit in the signal wire
- Open circuit in the supply wire
- Diagnostic line short circuit or open circuit
- Damaged ignition coil
What you can do
- 1If you have a diagnostic tool, start the engine and read the fault status. 'No fault found' means the fault is not active right now.
- 2Check that the fuses are intact.
- 3With the ignition off, check the connector at the ignition coil for cylinder 8 for contact resistance and oxidation.
- 4Use a multimeter to check that the wires to the ignition coil for cylinder 8 have no open circuit and are not shorted to ground or supply voltage.
- 5Check that the ignition coil is secure and not damaged.
- 6If the fault returns, have a workshop examine the ignition coil for cylinder 8 and its diagnostic line.
Symptoms you may notice1
- Engine misfires
What the fault can affect1
- Closed loop control of lambda is blocked
General guidance for car owners. Diagnosis on the car can point to a different cause.