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Home >> Chevrolet >> 1997 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - Tests W/Codes - 6.5L) >> Diagnostic Trouble Codes >> DTC P1641 - Malfunction Indicator Light (Mil) Control Circuit >> Circuit Description

Circuit Description

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MIL is illuminated by PCM if diagnostics have detected certain errors related to engine performance or engine sensor status. Illumination is accomplished by PCM providing a ground path for light circuit.

DTC will set when the following conditions are present:

Or