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Home >> Chevrolet >> 2000 >> Lumina >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L >> Diagnostic Tests >> DTC P1637: Charging System Light Control Circuit >> Code Enable Criteria

Code Enable Criteria

PCM will run diagnostic for this DTC when ignition is on. DTC will set when an improper voltage level has been detected on the alternator light driver circuit. Conditions must be present for at least 20 seconds.