VOLVO
ECM-P065221 - Sensor Reference Voltage B Circuit Low. General Signal Failures. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (8)
- Volvo S80 (2007–)2007–2009Engine D5244T4, D5244T5 only
- Volvo S80 (2007–)2010–2011Engine D4164T only
- Volvo V70 (2008–)2008–2009Engine D5244T4, D5244T5 only
- Volvo V70 (2008–)2010–2011Engine D4164T only
- Volvo XC60 (2009–)2009All engines except: B6304T2
- Volvo XC70 (2008–)2008All engines except: B6324S
- Volvo XC70 (2008–)2009Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2013–2014Engine D5244T18, D5244T5 only
What does this fault code mean?
The code concerns a signal that is too low from some of the engine's sensors, where the supply from the ECM is the part being monitored. It is set when the supply voltage is too low or too high. Tracing is done through the other fuel system codes.
Possible causes
- Supply cable to the sensors shorted to battery voltage
- Fault in the fuel system, to be traced through the other fuel system codes
What you can do
- 1Check that the relevant fuses are intact and that the battery is in good condition
- 2Where possible, check the relevant functions of the car with the buttons, controls or a test drive
- 3With the ignition off, use a multimeter to check that the supply wire to the sensors is not shorted to battery voltage
- 4Trace the other fuel system fault codes first
Symptoms you may notice3
- The car performs poorly and lacks power, especially at take-off
- The engine hesitates or surges during acceleration, during deceleration or at steady speed
- Warning symbol and text message in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.