OBD-II code · Powertrain (generic)
P0334 Knock/Combustion Vibration Sensor B Circuit Intermittent
Knock sensor B signal jumps or drops out intermittently — usually a corroded connector or chafed wire near the cylinder head.
Is it safe to drive with P0334?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent connector
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Knock Sensor
Related codes
- P0329Knock/Combustion Vibration Sensor A Circuit Intermittent
- P032EKnock/Combustion Vibration Sensor C Circuit Intermittent
- P033EKnock/Combustion Vibration Sensor D Circuit Intermittent
- P0331Knock/Combustion Vibration Sensor B Circuit Range/Performance
- P0332Knock Sensor 2 Circuit Low Input (Bank 2)
- P0333Knock Sensor 2 Circuit High Input (Bank 2)
- P0335Crankshaft Position Sensor "A" Circuit Malfunction
- P0336Crankshaft Position Sensor "A" Circuit Range/Performance
- P0337Crankshaft Position Sensor "A" Circuit Low Input
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.