Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
The cost of diagnosing the P102D GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
The Glow Plug Control Module has the ability to perform internal temperature diagnostics for the microprocessor and the glow plug drivers. If the Glow Plug Control Module temperature sensor 2 is not within 12°C (54°F) of Glow Plug Control Module temperature sensor 1 and Glow Plug Control Module Temperature Sensor 3; and the difference between Glow Plug Control Module Temperature Sensor 1 and Glow plug control module Temperature Sensor 3 is less than 12°C (54°F) for greater than 2 s, a Diagnostic Trouble Code (DTC) will be set. The Glow Plug Control Module will send a message to the Engine Control Module (ECM) to set this DTC.
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