Glow Plug Control Module Software Update

A Glow Plug Control Module (GPCM) DTC or individual glow plug DTCs may be set, along with an illuminated Check Engine MIL, on some 2017 Silverado and Sierra models equipped with the 6.6L Duramax diesel engine (RPO L5P). (Fig. 12) Follow the appropriate diagnostic information in the Service Information for any glow plug-related DTCs.


Fig 12


Anytime a glow plug is replaced, check the GPCM software level and determine if a newer version is available. Update the GPCM using the Service Programming System (SPS) if needed.


– Thanks to John Stempnik

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