VOLVO
ECM-0626 - Generator. Signal too high
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 ECM supervises the charging voltage and how the generator works. When the generator signal is too high, the fault is treated as an error and the code is set. The cause may be a signal wire shorted to supply voltage or a damaged charge regulator, which can show up as power supply problems.
Possible causes
- Signal wire short-circuited to supply voltage
- Damaged charge regulator
What you can do
- 1Check that the generator works mechanically and is not damaged, and that the drive belt is correctly fitted
- 2Check the signal wire to the generator for chafing that could let it touch a live supply wire
- 3Use a multimeter to check that the signal wire has no contact with supply voltage
- 4If the fault remains after these checks, the charge regulator is a likely cause; a workshop should assess it and replace it
Symptoms you may notice1
- Charging or power supply problems
General guidance for car owners. Diagnosis on the car can point to a different cause.