VOLVO
ECM-P053164 - A/C Refrigerant Pressure Sensor "A" Circuit Range/Performance. Algorithm Based Failures. Signal plausibility failure
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
1 modelXC90 (2003–)
Show models by year and engine (1)
What does this fault code mean?
The ECM monitors the pressure in the A/C system using the signal from the A/C pressure sensor. The code is set when the signal wire is shorted to ground or supply voltage, or when it has a break. The cause lies in the sensor or in the wiring to it.
Possible causes
- Signal wire shorted to supply voltage, giving too high a signal
- Supply wire to the sensor shorted to battery voltage
- Signal wire shorted to ground, giving too low a signal
- Break or short to ground in the supply wire
- Break in the signal wire or the ground wire
- Damaged A/C pressure sensor
What you can do
- 1Check that the fuses are intact
- 2Check the A/C pressure sensor connector for oxidation and loose contacts
- 3Use a multimeter to check that the signal wire to the sensor has no contact with ground or supply voltage and no break
- 4Use a multimeter to check that the supply wire to the sensor has no break and is not shorted to ground
- 5If you have a diagnostic tool, read the A/C pressure in live data with the engine running and check whether the value is plausible and changes
- 6If the fault returns, have a workshop with diagnostic equipment check the sensor and its wiring
Symptoms you may notice3
- The air conditioning does not work
- The air conditioning cools slowly in the rear area
- The air conditioning does not cool enough in the front area
What the fault can affect1
- The A/C pressure sensor is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.