Mike's Workshop Manuals
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GMC
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2000
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C3500 HD 6.5 F, Standard
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Repair and Diagnosis
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Engine Control System Self-Diagnostics - Diesel
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Diagnostic Tests
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DTC P1643: Wait To Start Light Control Circuit
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Diagnostic Aids
Diagnostic Aids
A faulty bulb or short to ground in WAIT TO START control circuit will cause DTC P1643 to set.