Knock/Combustion Vibration Sensor D Circuit Low

Where it lives

For P033C, the sensor sits on the circuit this code reports. The description of P033C reports a fault at the sensor.

Check these first

• A faulty knock sensor D
• A short to ground on the sensor D circuit
• Corrosion at the sensor D connector
• Low battery voltage
• A faulty ECM input

What to do next

1. Read knock sensor D on a scan tool
2. Inspect the sensor D connector and wiring
3. Check the sensor D circuit for a short to ground
4. Measure battery voltage and the charging system
5. Replace knock sensor D if the signal stays low
6. Clear the code and retest

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