VOLVO
ECM-0625 - Generator. Signal too low
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 (10)
- Volvo C30 (2007–2013)2007Engine D4204T only
- 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)2004–2006Engine D4204T, D4204T2 only
- Volvo S40 (2004–2013)2007Engine D4204T only
- Volvo S40 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo V50 (2004–2013)2004–2006Engine D4204T, D4204T2 only
- Volvo V50 (2004–2013)2007Engine D4204T only
- Volvo V50 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
What does this fault code mean?
The engine control module (ECM) keeps track of the charging voltage and generator function. If the signal from the generator is too low, the code is set. The cause may be poor connections, a break in the signal wire or a damaged charge regulator, and the fault can appear as power supply problems in the car.
Possible causes
- Contact resistance in the generator terminals
- Open circuit in the signal wire
- Signal wire shorted to earth
- Damaged charge regulator
What you can do
- 1With the ignition off, unplug the generator connector and check that its terminals are tight and free from oxidation
- 2Use a multimeter to check the signal wire for an open circuit and for a short to earth
- 3Check that the drive belt is correctly fitted and that the generator is not mechanically damaged
- 4If the fault remains after these checks, the charge regulator is a likely cause; a workshop should assess it and replace it if needed
Symptoms you may notice1
- Power supply problems in the car
General guidance for car owners. Diagnosis on the car can point to a different cause.