GM Service Manual Online
For 1990-2009 cars only
Makes
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GMC_Truck
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2003
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Sonoma Pickup - 4WD
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Body and Accessories
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Data Link Communications
🢒 Diagnostic Trouble Code (DTC) List
DTC
Diagnostic Procedure
Module
B1477
DTC B1477 or B1478
BCM
B1478
DTC B1477 or B1478
BCM