P0329
Knock/Combustion Vibration Sensor A Circuit Intermittent
Knock sensor A signal jumps or drops out intermittently — usually a corroded connector or chafed wire near the cylinder head.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Intermittent connectorCommon
- Gateway module routing CAN messages incorrectlyLess likely
- CAN terminating resistor (120 Ω) drifted out of specLess likely
Parts involved
- Knock Sensor
P0329 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.