Reductant Control Module Internal Temperature Sensor Circuit High

Common symptoms

What you'll notice

• Check the reductant control module connections and wiring for any loose or damaged components.
• Test the internal temperature sensor using a multimeter to ensure it is functioning correctly.
• Replace the reductant control module internal temperature sensor if it is determined to be faulty.
• If all else fails, consider replacing the entire reductant control module, as it may be experiencing internal malfunctions that cannot be repaired.

Common causes

Most likely first

1. Faulty reductant control module temperature sensor
2. Loose or damaged wiring in the reductant control module temperature sensor circuit
3. Corrosion or contamination in the reductant control module temperature sensor circuit
4. Faulty reductant control module
5. Engine overheating

How to diagnose & fix

Work through it in order

1. Engine performance issues such as reduced power or hesitation
2. Check Engine Light (CEL) illuminating on the dashboard
3. Poor fuel efficiency
4. Difficulty starting the vehicle
5. Increased emissions or failed emissions test