VOLVO
ECM-P033211 - Knock Sensor 2 Circuit Low (Bank 2). General Electrical Failures. Circuit short to ground
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–)
Show models by year and engine (20)
- Volvo S60 (2011–)2011Engine B4164T, B4164T3, B4204T6, B4204T7 only
- Volvo S60 (2011–)2012–2014Engine B4164T, B4164T2, B4164T3, B4204T7 only
- Volvo S60 (2011–)2015Engine B4164T, B4164T2, B4164T3 only
- Volvo S80 (2007–)2010Engine B4204T6 only
- Volvo S80 (2007–)2011Engine B4164T, B4204T6, B4204T7 only
- Volvo S80 (2007–)2012–2014Engine B4164T, B4164T2, B4204T6, B4204T7 only
- Volvo S80 (2007–)2015Engine B4164T only
- Volvo V40 (2013–)2013Engine B4164T, B4164T3 only
- Volvo V40 (2013–)2014–2015Engine B4164T, B4164T3, B4164T4 only
- Volvo V40 Cross Country (2013–)2013–2015Engine B4164T only
- Volvo V60 (2011–)2011Engine B4164T, B4164T3, B4204T6, B4204T7 only
- Volvo V60 (2011–)2012–2014Engine B4164T, B4164T2, B4164T3, B4204T7 only
- Volvo V60 (2011–)2015Engine B4164T, B4164T2, B4164T3 only
- Volvo V70 (2008–)2010Engine B4204T6 only
- Volvo V70 (2008–)2011Engine B4164T, B4204T6, B4204T7 only
- Volvo V70 (2008–)2012–2014Engine B4164T, B4164T2, B4204T7 only
- Volvo V70 (2008–)2015Engine B4164T, B4164T2 only
- Volvo XC60 (2009–)2010Engine B4204T6 only
- Volvo XC60 (2009–)2011–2012Engine B4204T6, B4204T7 only
- Volvo XC60 (2009–)2013–2015Engine B4204T7 only
What does this fault code mean?
The signal from the right knock sensor is too low. The engine control module (ECM) compares the signal with limits and sets the fault code when it deviates. A signal cable that has been short-circuited to ground is one possible cause. Poor contact, a break or a damaged sensor can produce the same fault code.
Possible causes
- Signal cable short-circuited to ground
- Contact resistance in the knock sensor connections
- Break in the signal cable
- Short circuit between the knock sensors' signal cables
- Damaged knock sensor
What you can do
- 1Read the fault code, clear it and test drive the car
- 2Check the signal cable from the right knock sensor for a short to ground; with a multimeter, confirm that the cable has no contact with the body
- 3Check the connections to the right knock sensor for contact resistance and oxidation
- 4If you have a diagnostic tool: read the knock signal from the right sensor in live data with the engine running and see whether it is too low
- 5Have a workshop with diagnostic equipment check the wiring and replace the knock sensor if needed
Symptoms you may notice1
- Poor performance and lack of power while driving
What the fault can affect2
- Ignition timing is retarded as a safety measure
- Boost pressure is reduced
General guidance for car owners. Diagnosis on the car can point to a different cause.