P0620 OBD Trouble Code

1 result found

P0620 - GM
Type Powertrain - Computer and Auxiliary Outputs - ISO/SAE Controlled

Generator Performance Conditions


Engine speed below 1000 rpm (low duty cycle test) or over 1300 rpm (high duty cycle test), Voltage Telltale lamp "on", then the PCM detected the 'L' terminal voltage was in a low state after commanding the generator on (condition met for 10 seconds) or that the 'F1 terminal PWM was less than 10% for 30 seconds, or the 'F' terminal was more than 95% for 60 seconds

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