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.
Circuit Description
The starter/generator control module (SGCM) coolant pump/fan relay supplies battery voltage to the SGCM coolant pump relay and the SGCM coolant fan relay. The SGCM monitors the temperature of the low side driver for the SGCM coolant pump/fan relay. The temperature sensor of the driver is not serviceable and the data for this sensor is not available on the scan tool. This internal driver temperature sensor aids in detecting a control circuit shorted to ground or a shorted relay coil.
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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.