Having a Ford P0620 Code can be frustrating and worrisome when it comes to figuring out the cause and solution. This code is specifically related to the Generator Control Circuit. The Powertrain Control Module (PCM) reads the GENLI and sends a DTC through the network when the GENLI indicates a concern. To help troubleshoot the issue, it is important to verify the battery voltage, as well as check the generator/regulator for the correct part number. The PCM sets this DTC if the GENCOM circuit, A sense circuit, or B+ circuit is open or shorted to ground.
Causes and Solutions for the Ford P0620 Code
| Cause | Solution |
|---|---|
| Battery voltage is not at 145 volts. | Check the battery voltage and recharge if necessary. |
| Generator/regulator has incorrect part number. | Replace the generator/regulator with the correct part number. |
| GENCOM circuit, A sense circuit, or B+ circuit is open or shorted to ground. | Check the circuit for any open or shorted connections. |
| Related Service Bulletins: 21-2219 and SSM44396. | Refer to the service bulletins for more information. |
Battery Voltage not at 145 Volts
When a Ford P0620 code is received, the first step is to check the battery voltage. This should be done with a digital voltmeter to ensure the correct reading. If the voltage is not at 145 volts, the battery should be recharged or replaced. This is a simple and straightforward solution that can be done quickly.
Generator/Regulator with Incorrect Part Number
If the battery voltage is correct, the next step is to check the generator/regulator for the correct part number. If it is not the right part number, the generator/regulator should be replaced with the correct one. This can be done quickly and with minimal effort.
GENCOM Circuit, A Sense Circuit, or B+ Circuit is Open or Shorted to Ground
If the battery voltage and generator/regulator are correct, the next step is to check the GENCOM circuit, A sense circuit, and B+ circuit for any open or shorted connections. If any of these circuits are open or shorted to ground, the connections should be checked and repaired.
Refer to Service Bulletins for More Information
In addition to the steps outlined above, it is also important to refer to the service bulletins 21-2219 and SSM44396 for more information on the Ford P0620 code. This can provide additional insight into the cause and solution of this code.
Conclusion
Having a Ford P0620 code can be a frustrating and worrisome experience. However, by verifying the battery voltage, checking the generator/regulator for the correct part number, and checking the GENCOM circuit, A sense circuit, and B+ circuit for any open or shorted connections, the issue can be resolved quickly and easily. In addition, referring to the service bulletins 21-2219 and SSM44396 can provide additional insight into the cause and solution of this Ford P0620 Code.
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