VOLVO
ECM-F003 - Battery voltage
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsC30 (2007–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2008–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo C30 (2007–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo C30 (2007–2013)2011–2013Engine B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2008–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo S40 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2008–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo V50 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
What does this fault code mean?
The engine control module keeps watch on the system voltage and holds it against a reference value that the CEM sends over CAN. The fault code is set when the module measures a lower voltage than the one sent. The cause is contact resistance or poor contact in the connections.
Possible causes
- Contact resistance, oxidation or loose contact in the connections
What you can do
- 1Check that the battery is charged and that the battery terminals are tight and not corroded
- 2Check that the fuses are intact. Their locations are in the owner's manual
- 3Check the connectors at the engine control module and the CEM for play, oxidation and contact resistance
- 4If you have a diagnostic tool: compare the voltage the engine control module shows in live data with the battery voltage at the terminals
- 5Erase the fault code and road test the car to see whether it comes back
- 6If the fault remains, have a workshop check the earth and the wiring to the engine control module
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.