VOLVO
ECM-810C - 5 volt power supply. Signal too high
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (14)
- Volvo S60 (2001–2009)2005–2006Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2008–2009Engine B5204T5, B5244T5, B5254T2 only
- Volvo S80 (1999–2006)2005–2006Engine B5204T5, B5244T4, B5254T2, B6294S2, B6294T only
- Volvo V70 (2000–2008)2005Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2006–2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2008Engine B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2005All engines except: D5244T
- Volvo V70 XC / XC70 (2001–2007)2006Engine B5244T4, B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2007Engine B5254T2 only
- Volvo XC90 (2003–)2005–2006Engine B5254T2, B6294T only
- Volvo XC90 (2003–)2007–2012Engine B5254T2 only
- Volvo XC90 (2003–)2013–2014Engine B5254T9 only
- Volvo XC90 (2003–)2015
What does this fault code mean?
The engine control module checks the 5 volt wire that supplies power to sensors and other components. If the voltage on that wire becomes too high, the module treats it as a fault and sets the code. The cause may be a wire shorted to battery voltage or a damaged sensor on the wire. The engine may perform worse than normal.
Possible causes
- The 5 volt supply wire is shorted to battery voltage
- A sensor on the 5 volt wire has failed
What you can do
- 1Read and note the code, clear it and road test to see whether it returns
- 2Inspect the wiring to the sensors on the 5 volt wire for chafing or pinching that may have let it touch a live wire
- 3If you have a diagnostic tool: read the sensor values in live data and check whether any is unreasonably high
- 4Check that the sensor connectors are secure and free from corrosion
- 5If the fault remains, have a workshop with diagnostic equipment check the sensors and the 5 volt wire
Symptoms you may notice1
- Engine performance is worse than normal
General guidance for car owners. Diagnosis on the car can point to a different cause.