VOLVO
ECM-P252000 - A/C Request A Circuit Low. General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsS60 (2011–), S80 (2007–), V70 (2008–)
Show models by year and engine (9)
- Volvo S60 (2011–)2011–2012Engine B5254T5 only
- Volvo S80 (2007–)2007–2008Engine B5254T6 only
- Volvo S80 (2007–)2009Engine B5254T6, B5254T8 only
- Volvo S80 (2007–)2010–2011Engine B5254T10, B5254T11, B5254T8 only
- Volvo S80 (2007–)2012Engine B5254T10 only
- Volvo V70 (2008–)2008Engine B5254T6 only
- Volvo V70 (2008–)2009Engine B5254T6, B5254T8 only
- Volvo V70 (2008–)2010–2011Engine B5254T10, B5254T11 only
- Volvo V70 (2008–)2012Engine B5254T10 only
What does this fault code mean?
The code concerns the control valve in the A/C compressor, which the engine control module drives with PWM. The control module compares the valve signal with predefined limits and stores the code when the signal is outside them. Possible causes are a short in the signal wire, an open circuit in the supply wire or a damaged valve.
Possible causes
- Signal wire short-circuited to supply voltage
- Signal wire short-circuited to ground
- Open circuit in the voltage supply cable
- Damaged control valve (solenoid)
What you can do
- 1If you have a diagnostic tool, read the fault status with A/C switched on and see whether the fault is still active
- 2Check that the relevant fuses are intact
- 3Check the connector to the control valve in the A/C compressor for contact resistance and oxidation
- 4Use a multimeter to check that the supply cable to the control valve has no open circuit and is not short-circuited to ground (body)
- 5If the fault remains, have a workshop with diagnostic equipment check the control valve in the A/C compressor
Symptoms you may notice1
- Uneven cooling from the A/C system
General guidance for car owners. Diagnosis on the car can point to a different cause.