What Does P0331 Mean?
Knock sensor 2 on Bank 2 is providing a signal that falls outside the expected range or exhibits erratic performance. The sensor is generating output, but the PCM determines it is unreliable for accurate knock detection. This may be caused by the sensor itself, its mounting, or engine mechanical conditions creating abnormal vibration patterns on Bank 2.
Common Causes
30%
Incorrect mounting torque on knock sensor 2 altering sensitivity
25%
Engine mechanical noise on Bank 2 causing false knock detection patterns
20%
Aging knock sensor 2 with degraded piezoelectric response
15%
Contaminated sensor mounting surface on Bank 2 from oil or coolant leak
10%
Wiring or shielding issue causing signal interference or attenuation
Diagnostic Steps
1
Compare knock sensor 2 PID data to knock sensor 1 at matching RPM and load points — they should show comparable baseline levels and response curves.
2
If the sensor is accessible, remove it and inspect the engine block mounting boss for flatness, oil residue, or corrosion. Clean thoroughly and reinstall with a new washer at correct torque.
3
Use a stethoscope to check for Bank 2 specific mechanical noises — listen at each cylinder rod bearing area and at the timing chain/belt tensioner on that side.
4
Verify the knock sensor 2 wiring shielding is intact along its entire length and properly grounded at the PCM end only.
5
If mounting and wiring are confirmed good, replace the knock sensor 2 and verify proper operation through a complete drive cycle.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
Knock sensor 2 on Bank 2 is providing a signal that falls outside the expected range or exhibits erratic performance. The sensor is generating output, but the PCM determines it is unreliable for accurate knock detection. This may be caused by the sensor itself, its mounting, or engine mechanical con...
The most common cause of P0331 (Knock Sensor 2 Circuit Range/Performance (Bank 2)) is: Incorrect mounting torque on knock sensor 2 altering sensitivity
Typical repair costs for P0331 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe for normal driving. Bank 2 timing may be inconsistent, causing some power fluctuation. Avoid heavy load and towing. Schedule diagnosis within a few weeks to verify no mechanical issue is causing the out-of-range signal.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0331 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Ignition / Knock Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
