OBD-II code · Powertrain (generic)
P033D Knock/Combustion Vibration Sensor D Circuit High
Knock sensor D signal above upper plausibility — open signal or short to B+. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P033D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen signal line
- 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
- P032DKnock/Combustion Vibration Sensor C Circuit High
- P033AKnock/Combustion Vibration Sensor D Circuit
- P033BKnock/Combustion Vibration Sensor D Circuit Range/Performance
- P033CKnock/Combustion Vibration Sensor D Circuit Low
- P033EKnock/Combustion Vibration Sensor D Circuit Intermittent
- P033FCrankshaft/Camshaft Loss Of Synchronization
- P0340Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.