Question about 2003 GMC Sierra 1500
Has the instrument cluster been replaced, i have seen incorrect software programmed into it causing concern
Posted on Jun 19, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
The power 5-volts reference is shorted to ground or battery positive.
Action Taken When the DTC Sets
The red BRAKE Warning indicator turns ON.
DTC C1100 will set as result of power brake booster vacuum sensor or circuit failure, test for power and ground circuits to the EBCM.
Repair the power or ground circuits.
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