Sensor Reference Voltage F Circuit High

Where it lives

For P06D8, the circuit described runs through the sensor. The description of P06D8 reports a fault at the sensor.

Check these first

• A short to voltage on the reference F circuit
• A sensor on the reference F circuit with an internal short
• Corrosion or water in a connector on the reference F circuit
• A failed PCM reference F output
• A charging system overvoltage feeding the reference

What to do next

1. Measure reference F voltage at the PCM with the key on
2. Unplug sensors on the circuit one at a time and watch the voltage drop
3. Test the reference F wire for a short to voltage
4. Check charging voltage for overvoltage
5. Replace the PCM if reference F stays high with sensors unplugged
6. Clear the code and retest

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