VOLVO
ECM-P146321 - A/C Pressure Sensor Insufficient Pressure Change. 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 (6)
- Volvo S80 (2007–)2007–2009Engine D5244T4, D5244T5 only
- Volvo V70 (2008–)2008–2009Engine D5244T4, D5244T5 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?
Pressure in the A/C system is watched by the engine control module (ECM). The code is set when the pressure does not rise as expected on the high-pressure side when the compressor starts, and the signal from the sensor is too low. The fault can be checked when the A/C is switched on.
Possible causes
- Leak in the A/C system
- Damaged pressure sensor
- Damaged A/C compressor
What you can do
- 1Check that the fuses are intact. Their location is in the owner's manual or on the fuse box cover.
- 2Switch on the air conditioning at maximum cooling and check that the compressor engages. Listen for a click when it starts.
- 3With the ignition off, check the connector at the A/C pressure sensor for looseness, contact resistance and corrosion.
- 4If you have a diagnostic tool, read the pressure from the A/C pressure sensor with the A/C on, and check that it rises when the compressor runs.
- 5If the compressor engages but the cooling is absent, or if the fault remains, have a workshop check the A/C system for leaks and the compressor.
Symptoms you may notice1
- The air conditioning does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.