Knock/Combustion Vibration Sensor B Circuit Intermittent

Where it lives

For P0334, the circuit described runs through the sensor. The description of P0334 reports a fault at the sensor.

Check these first

• An intermittent knock sensor B fault
• A loose or corroded sensor B connector
• Wiring chafing on the sensor B circuit
• An ignition fault causing engine knock
• A faulty ECM input

What to do next

1. Monitor knock sensor B on a scan tool for dropouts
2. Inspect the sensor B connector and wiring for looseness
3. Wiggle test the harness while watching the signal
4. Check the ignition system for misfires
5. Replace knock sensor B if it drops out
6. Clear the code and retest

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