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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 31 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0402-P2636)) >> DTC P0642 or P0643 >> DTC Descriptors

DTC Descriptors

WARNING: This page is about a different variant/trim than selected.
DTC P0642

5-Volt Reference 1 Circuit Low Voltage

DTC P0643

5-Volt Reference 1 Circuit High Voltage

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