VOLVO
ECM-8500 - 5 volt power supply. Faulty signal
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 (9)
- Volvo C30 (2007–2013)2007Engine B5254T3 only
- Volvo C30 (2007–2013)2008–2013Engine B5254T7 only
- Volvo C70 (2006–2013)2006–2007Engine B5254T3 only
- Volvo C70 (2006–2013)2008–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2005–2007Engine B5254T3 only
- Volvo S40 (2004–2013)2008Engine B5254T3, B5254T7 only
- Volvo S40 (2004–2013)2009–2012Engine B5254T7 only
- Volvo V50 (2004–2013)2005–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 only
What does this fault code mean?
The ECM supervises the internal voltage circuits feeding the components. The code is set if voltage in any one of these circuits goes high, low or disappears, and the check runs with the ignition on. The code covers all three cases.
Possible causes
- Voltage cable to a sensor shorted to ground
- Voltage cable to a sensor shorted to voltage
- Damaged sensor
- Damaged engine control module (ECM)
What you can do
- 1Read the code, clear it and check that it is not active after the road test
- 2Check the sensor voltage cables for chafing and for contact with ground or voltage; use a multimeter against ground (the body)
- 3Check that the sensor connectors are fully engaged and free from oxidation
- 4If you have diagnostic equipment, read the sensor values in live data with the ignition on and see whether any one gives an implausible reading
- 5If the code remains after these checks, have a workshop decide whether the control module needs replacing
Symptoms you may notice5
- Poor performance
- The starter motor does not turn
- The starter cranks but the engine will not start
- The engine misfires
- The engine is hard to start
General guidance for car owners. Diagnosis on the car can point to a different cause.