Sensor Reference Voltage D Circuit Low

Where it lives

For P06A4, the sensor sits on the circuit this code reports. The description of P06A4 reports a fault at the sensor.

Check these first

• A short to ground on the D reference circuit
• A failed sensor pulling the D reference down
• Corroded D circuit wiring
• Low battery voltage
• A faulty ECM

What to do next

1. Read the D reference voltage on a scan tool
2. Check the circuit for a short to ground
3. Disconnect sensors to isolate the fault
4. Verify battery and charging
5. Repair the wiring or replace the ECM
6. Clear the code and retest

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