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.
Glow Plug Control Module
The glow plug control module receives fused power directly from the batteries. The ECM communicates with the glow plug control module over the CAN. The glow plugs are grounded through the cylinder head. The ECM calculates an average temperature based on inputs from the engine coolant temperature sensor, the air intake manifold temperature sensor, and an internal temperature sensor in the glow plug control module. After the required conditions are met, the glow plug control module sends an output to each of the eight glow plugs individually. The glow plug control module monitors the operation of individual glow plugs and reports malfunctions back to the ECM. The glow plugs begin activating with the ignition switch on during the wait-to-start sequence and will continue to operate after cranking if the ECM determines the glow plugs are needed.
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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.