Knock/Combustion Vibration Sensor D Circuit Intermittent

Where it lives

For P033E, the sensor sits on the circuit this code reports. The description of P033E reports a fault at the sensor.

Check these first

• An intermittent knock sensor D fault on bank 2
• A loose or corroded sensor D connector
• Wiring chafing on the sensor D circuit
• Wrong engine oil or fuel grade
• A faulty ECM input

What to do next

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

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