P2338
Cylinder 3 Above Knock/Combustion Vibration Sensor Threshold
P2338 is an OBD-II diagnostic trouble code meaning: Cylinder 3 Above Knock/Combustion Vibration Sensor Threshold. Common causes: poor fuel quality (low octane number), knock sensor malfunction. Estimated repair cost: $17–89.
Symptoms
- Knocking or ringing noise from the engine
- Loss of engine power
- Increased fuel consumption
- Unstable engine idling
- Check engine light comes on
Causes
- Poor fuel quality (low octane number)
- Knock sensor malfunction
- Problems with the ignition system (plugs, coils)
- Carbon accumulation in the combustion chamber
- Malfunction of fuel injectors
How to Fix
- Check fuel quality and replace if necessary
- Check the condition of the spark plugs and coils
- Diagnose the knock sensor and its wiring
- Clean the combustion chamber from carbon deposits
- Check the operation of the fuel injectors
Related codes
Error P2338 by Vehicle Brand
FAQ
What does the P2338 code mean?
P2338 is an OBD-II diagnostic trouble code that indicates: Cylinder 3 Above Knock/Combustion Vibration Sensor Threshold
What causes a P2338 error code?
The most common causes of P2338 include: Poor fuel quality (low octane number); Knock sensor malfunction; Problems with the ignition system (plugs, coils); Carbon accumulation in the combustion chamber.
How do I fix a P2338 diagnostic trouble code?
To fix P2338: Check fuel quality and replace if necessary. Check the condition of the spark plugs and coils. Diagnose the knock sensor and its wiring. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2338?
Limited driving only, diagnose soon
How much does it cost to fix P2338?
The estimated repair cost for P2338 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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