Reductant Metering Unit Temperature Sensor Circuit

Where it lives

For P20AC, the circuit described runs through the sensor. The description of P20AC reports a fault at the sensor.

Check these first

• An open or short in the reductant metering unit temperature sensor circuit
• A failed reductant metering unit temperature sensor
• A backed out pin at the metering unit connector
• Chafed wiring along the metering unit harness

What to do next

1. Read reductant metering unit temperature on a scan tool
2. Test the sensor circuit for open and short faults
3. Check the metering unit connector pins
4. Verify reference voltage at the sensor
5. Replace the reductant metering unit temperature sensor if faulty
6. Clear the code and retest

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