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.
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HOMESERVICE MANUALSCHEVROLET2012SILVERADO 2500 4WD V8-6.6L DSL TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTGLOW PLUG SYSTEMRELAYS AND MODULES - GLOW PLUG SYSTEMGLOW PLUG CONTROL MODULETESTING AND INSPECTION
2012 Chevrolet Silverado 2500 4WD V8-6.6L DSL Turbo
Glow Plug Control Module: Testing and Inspection
2012 Chevrolet Silverado 2500 4WD V8-6.6L DSL TurboSECTION Testing and Inspection
Glow Plug Control Module Programming and Setup (LGH or LML)
Note: The glow plug control module (GPCM) does not allow programming if its temperature is above 60°C (140°F).
The following service procedures require either a programming or a setup event performed for a complete repair.
GPCM Replacement
If the GPCM is replaced, the following procedures must be performed.
Fuel Injector Flow Rate Programming Programming and Relearning for fuel injector flow rate programming
Setup for Component Replacement
The replacement of some components will require a setup procedure for complete repair.
If any of the following components are replaced, the Fuel Injector Flow Rate Programming must be performed. Refer to Fuel Injector Flow Rate Programming Programming and Relearning.
* Fuel injector
* Engine control module (ECM)
* GPCM
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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.