Chevrolet P0621 Generator Lamp L Control Circuit Malfunction Diagnostic Trouble Code, Definition, explanations, And fixing Guide


What does this mean?

Definition of OBD2 Code P0621 Chevrolet:
Engine Control Module (ECM) or Powertrain Control Module (PCM) uses a signal area generator to control the load of the generator on the engine. The main controller in ECM / PCM controls the power supply on the control panel. This prompts the power supervisor to open the starting and ending phase. ECM / PCM controls how the generator operates in the control area. ECM / PCM should detect a slight decrease in the generator of the ignition circuit when the ignition is ON and the engine is OFF, or the operating system is interrupted. With the use of an engine, ECM / PCM should be aware of the significant impact on the change in generator circuit. ECM / PCM tests the Ignition ON and RUN tests to determine the generator’s movement in the signal area.


Possible indicators of OBD code P0621 Chevrolet
– Light Light ON (or Light Engine Light Light)


Which could trigger the OBD P0621 Chevrolet code
– Generator Area – Generator Shortcut – Extensive Generator / Extreme Generator – Short Generator Area to Electricity – Bad Generator / Switch Generator – ECM / PCM Error is usually detected by detecting the following items: – During Testing, ECM / PCM detects multiple volumes on signal signal generator for 5 seconds. – During the RUN test, ECM / PCM detects low volumes on signal signal generator for 15 seconds.

Possible Answers

– replacement of alternator / generator

Details of Code OBD2 should be used on Chevrolet

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