Reductant Metering Unit Temperature Sensor Circuit Low

Where it lives

For P20AE, the circuit described runs through the sensor. The description of P20AE reports a fault at the sensor.

Check these first

• A short to ground on the reductant metering unit temperature sensor signal wire
• A failed reductant metering unit temperature sensor
• A corroded metering unit connector pulling the signal low
• A low DEF level at the metering unit

What to do next

1. Read reductant metering unit temperature on a scan tool
2. Test the sensor signal wire for a short to ground
3. Inspect the metering unit connector for corrosion
4. Check the DEF level at the metering unit
5. Replace the reductant metering unit temperature sensor if the circuit tests good
6. Clear the code and retest

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