VOLVO
ECM-P233800 - Cylinder #3 Above Knock Threshold. General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS80 (2007–), V70 (2008–)
Show models by year and engine (2)
What does this fault code mean?
The knock sensor on the engine block is used by the engine control module (ECM) to monitor combustion knock, and the ignition is adjusted when needed. The code is set once knocking from cylinder 3 rises above a certain level, and
Possible causes
- The engine runs on a fuel/air mixture that is too lean
- Poor fuel quality, for example summer fuel in winter
- The engine is overheated
- The intake air temperature is too high
- The knock sensor is loosely fitted
- The knock sensor is damaged
What you can do
- 1Check that the relevant fuses are intact; their locations are shown in the car's owner's manual
- 2Read and note the code, clear it and test drive to see whether it returns
- 3Check that the knock sensor is firmly fitted and that its connector is free from corrosion
- 4Check that the fuel in use is right for the season
- 5If you have a diagnostic tool, see whether the intake air temperature in live data follows the outside temperature
- 6If the fault returns, have a workshop with diagnostic equipment check the knock sensor and the engine's fuel/air mixture
Symptoms you may notice1
- The engine performs poorly
General guidance for car owners. Diagnosis on the car can point to a different cause.