VOLVO
ECM-P023521 - Turbo/Super Charger Boost Sensor A Circuit. General Signal Failures. Signal too low
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 ECM tracks the reading from the boost pressure sensor. The fault is set when the signal stays below a certain value for a set time, which points to a signal fault in the sensor or its wiring.
Possible causes
- Contact resistance or oxidation in the connections
- Signal wire shorted to ground
- Damaged boost pressure sensor
What you can do
- 1Read the code, clear it and road test to see whether it returns
- 2If you have a diagnostic tool: read the boost pressure sensor signal in live data at idle and when the engine runs at higher revs, and see whether the value rises
- 3Look at the boost pressure sensor connector for oxidation and loose connections
- 4Use a multimeter to check that the signal wire to the boost pressure sensor is not shorted to ground
- 5Check that the fuses are intact. Fuse locations are shown in the owner's manual
- 6If the fault remains, have a workshop check the boost pressure sensor with diagnostic equipment
Symptoms you may notice2
- The malfunction indicator lamp comes on
- The car performs worse than usual
What the fault can affect1
- Boost pressure is limited
General guidance for car owners. Diagnosis on the car can point to a different cause.