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Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Denali 🢒 Bulletins 🢒 No Start / No rank - Loss Of High speed GMLAN Communication - keywords ABS BCM brake data ECM FPCM inoperative intermittent MIL no PIINSI resistor SES short start TCCM TCM U0100 U0101 U0102 U0106

No Start / No rank - Loss Of High speed GMLAN Communication - keywords ABS BCM brake data ECM FPCM inoperative intermittent MIL no PIINSI resistor SES short start TCCM TCM U0100 U0101 U0102 U0106

Subject:No Start/No Crank - Loss Of High Speed GMLAN Communication

Models:2007-2008 Chevrolet Silverado
2007-2008 GMC Sierra


This PI was superseded to update model years. Please discard PIT4444.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:

Some owners may comment of a no crank and/or no start concern, which may be an intermittent or hard fault. If intermittent, when viewing DTCs there will be communication codes for the High Speed GMLAN modules. If the concern is current, the Tech 2 will not be able to communicate with any High Speed GMLAN modules.

Recommendation/Instructions:

This concern could be caused by the High Speed GMLAN circuits (2500 and 2501) shorted to ground or together. Reports have been received of these circuits being pinched between the truck box and frame near the terminating resistor as shown in the picture below, see SI document 1858913 for location. To repair this concern remove the harness from between the box and frame and repair any damaged circuits.


Object Number: 1991762 Size: SH

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.