VOLVO
ECM-0670 - Glow Plug Module Control Circuit
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (5)
- Volvo C30 (2007–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo C70 (2006–2013)2008Engine D4204T only
- Volvo C70 (2006–2013)2009–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo S40 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo V50 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
What does this fault code mean?
The ECM switches the glow plugs on through a relay that sits in the engine bay relay and fuse box. The relay is fed through a fuse and earthed via the control module. The code is set when the signal in the control circuit is too high, missing or too low. A fault can make a diesel engine harder to start, especially when cold.
Possible causes
- Contact resistance or oxidation in the connections
- Signal wire open, or shorted to earth or to voltage
- Supply wire to the relay open, or shorted to earth
- Cables to the glow plugs shorted to earth or voltage
- Damaged glow plug relay
What you can do
- 1Check that the glow plug fuse is intact in the engine bay relay and fuse box
- 2If you have a diagnostic tool, activate the glow plugs and listen for the relay to click in
- 3Check the connectors at the glow plug relay and the control module for contact resistance and oxidation
- 4With the ignition off, use a multimeter to check the relay and glow plug wiring for contact with earth or supply voltage
- 5If the wiring is intact and the fault remains, have a workshop read the system with diagnostic equipment and decide whether the relay needs replacing
Symptoms you may notice2
- The engine starts poorly or not at all
- The engine does not turn over at start attempts
General guidance for car owners. Diagnosis on the car can point to a different cause.