Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Reductant Temperature Sensor
The reductant temperature sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical voltage signals to the PCM corresponding to temperature.
The reductant temperature sensor provides feedback to the PCM, which controls the reductant heaters to keep the reductant in a liquid state during low ambient temperatures. The reductant temperature sensor is integral to the reductant heater and sender assembly (Transit) or the reductant pump assembly (all others). For additional information on the reductant temperature sensor, refer to the reductant heater and sender assembly (Transit) or the reductant pump assembly (all others) description.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.