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C3500 HD 6.5 F, Standard
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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
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Diagnostic Aids
A faulty bulb or short to ground in WAIT TO START control circuit will cause DTC P1643 to set.