Reductant Control Module Temperature Sensor Performance

The reductant control module has a sensor that measures its temperature. If the sensor readings don’t match expected levels, it triggers this code.

The vehicle's computer sees that the temperature readings from the reductant control module are outside of the normal range during operation, affecting proper emissions control via SCR.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Inspect the wiring and connectors at the reductant control module and sensor for visible damage or corrosion. Decision: If any damage is found, repair or replace wiring/connectors. If not, proceed to step 2.
2. 22. Use a multimeter to test the resistance of the temperature sensor. Expected resistance at 25°C should be around 2.5k ohms. Decision: If the resistance is within range, go to step 3. If out of range, replace the sensor.
3. 33. Check the performance of the reductant control module itself using manufacturer-specific diagnostic tools. Decision: If errors are present indicating the module is faulty, replace the reductant control module. If no errors are found, further investigation into the ECU or SCR system may be necessary.

• Faulty reductant control module temperature sensor
• Wiring issues (frayed, open, or shorted wires)
• Faulty reductant control module
• Poor connection at the sensor or module

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