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 Heaters - Transit
The reductant heaters maintain the diesel exhaust fluid (DEF) in a liquid state during cold ambient temperatures. There are three heating elements in the system, each receiving voltage from the reductant dosage control module. The reductant pressure line heater is integral to the reductant pressure line. The reductant tank heater is integral to the reductant heater and sender assembly. For additional information on the reductant tank heater, refer to the REDUCTANT HEATER AND SENDER ASSEMBLY description. The reductant pump heater is integral to the reductant pump assembly. For additional information on the reductant pump heater, refer to the REDUCTANT PUMP ASSEMBLY 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.