P0620 Code - Generator Control Circuit Malfunction

What Does P0620 Mean?

This code indicates that a fault has been detected in the generator control circuit. The PCM or one of the other supporting control modules has detected this fault. These control modules may include (but are not limited to) the alternative fuel control module, the body control module, the antilock brake control module, the instrument panel control module, the fuel injection control module, the turbo control module, the anti-theft module, the cruise control module, the traction control module, proximity alert module, and the climate control module.

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What are the common causes of P0620 ?

• Battery charge
• Faulty Voltage Regulator
• Faulty Generator
• Generator harness is open or shorted
• Generator circuit poor electrical connection
• Engine Control Module (ECM) controlled generator
• Faulty ECM

How do you troubleshoot P0620 ?

Your mechanic will probably have to do one of the following:

• Replace any wires or other electronic components that are not working correctly
• Replace or repair the generator
• Replace or repair the PCM

Again, this last option is almost never necessary.

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