Reductant Temperature Sensor B Circuit High

Where it lives

For P2ACF, the circuit described runs through the sensor. The description of P2ACF reports a fault at the sensor.

Check these first

• An open circuit in the reductant temperature sensor B signal path
• A failed reductant temperature sensor B reading high
• A corroded sensor B connector in the DEF tank harness
• A sensor B signal wire broken by chafing at the tank

What to do next

1. Scan all modules and read reductant temperature sensor B
2. Inspect the reductant sensor B connector for corrosion or a broken wire
3. Test the sensor B signal circuit for an open from the tank to the module
4. Measure reductant temperature sensor B resistance against the DEF temperature range
5. Replace reductant temperature sensor B if the harness tests good
6. Clear the code and retest

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