VOLVO
ECM-P064322 - Sensor Reference Voltage A Circuit High. General Signal Failures. Signal too high
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 high, which shows up as a signal that is too high. The engine control module (ECM) monitors the supply circuit and sets the code when the voltage is too low or too high. It is most often a knock-on fault from another code, so that code should be traced first.
Possible causes
- Fault in the fuel system, to be traced using the other fuel system fault codes
What you can do
- 1Read the fault code and check whether it is still active with the ignition on
- 2Check other stored codes for a short to battery voltage in a sensor supply; several of them can point to a shorted ground point
- 3Check the wiring to the oil quality sensor, the fuel pressure sensor and the swirl damper, which may be affected, for chafing and loose connectors
- 4Use a multimeter to check that the wires to the sensors are not short-circuited to supply voltage or ground, and check that the relevant fuses are intact
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.