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1999
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C3500 HD 6.5 F, Automatic
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Repair and Diagnosis
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Engine Controls Tests W/Codes - Diesel
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Diagnostic Tests
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DTC P1641: Malfunction Indicator Light (Mil) Control Circuit ("C", "G", "K" & "P" Series)
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Diagnostic Aids
Diagnostic Aids
A faulty bulb, or short to ground or voltage in MIL control circuit will cause DTC P1641 to set.