VOLVO
ECM-P064221 - Sensor Reference Voltage A 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?
Reference voltage A to some of the engine's sensors is too low, which shows up as a signal that is too low. The engine control module (ECM) monitors the supply circuit and sets the code when the voltage is too low or too high. Tracing goes through the other fuel system codes.
Possible causes
- Fault in the fuel system, to be traced through the other fuel system codes
What you can do
- 1Read the fault code and check whether the fault is still active with the ignition on
- 2Trace the other fuel system fault codes first, since tracing this code is done through them
- 3Where possible, check the relevant functions of the car with the buttons, controls or a test drive to see whether the fault affects them
- 4Check the connectors and wiring to the sensors; with a multimeter, look for open circuits and shorts to ground or supply voltage
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.