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.
Affected components
- Knock sensor
Common causes
- High likelihood: Intermittent connector
- Low likelihood: Gateway module routing CAN messages incorrectly
- Low likelihood: CAN terminating resistor (120 Ω) drifted out of spec
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.