VOLVO
ECM-8800 - 15 supply to the control module. Faulty signal
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 (10)
- Volvo S60 (2001–2009)2001Engine D5244T only
- Volvo S60 (2001–2009)2002–2003, 2006Engine D5244T, D5244T2 only
- Volvo S60 (2001–2009)2004–2005Engine D5244T, D5244T2, D5244T3 only
- Volvo S80 (1999–2006)2001Engine D5244T only
- Volvo S80 (1999–2006)2002–2006Engine D5244T, D5244T2 only
- Volvo V70 (2000–2008)2001Engine D5244T only
- Volvo V70 (2000–2008)2002–2003, 2006Engine D5244T, D5244T2 only
- Volvo V70 (2000–2008)2004–2005Engine D5244T, D5244T2, D5244T3 only
- Volvo V70 XC / XC70 (2001–2007)2003–2006Engine D5244T only
- Volvo XC90 (2003–)2003–2006Engine D5244T only
What does this fault code mean?
The engine control module (ECM) monitors the signal to the main relay, which powers the control module through the 15 supply. The code is set when that signal is faulty. Some functions then cannot be checked or do not work normally, such as post-diagnosis and cruise control. The cause may be a short to ground in the signal wire or a defective main relay.
Possible causes
- Signal wire to the main relay shorted to ground
- Defective main relay
What you can do
- 1Read the code, clear it and road test the car to see whether it comes back
- 2Check the signal wire to the main relay for a short to ground; use a multimeter to confirm it has no contact with the body
- 3Check that the main relay is firmly seated and that its connections are free from oxidation
- 4If the fault remains after these checks, have a workshop replace the main relay if needed and confirm the 15 supply works
Symptoms you may notice2
- The engine cuts out
- The engine does not start
What the fault can affect3
- No post-diagnosis is carried out, and boost pressure is limited to the basic level
- Valves, relays and lamps fed from the 15 supply are not diagnosed
- Cruise control cannot be activated
General guidance for car owners. Diagnosis on the car can point to a different cause.