P0620 OBD Error Code: Problem & Solutions

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Error code P0620? Too complicated to crack? Not anymore! Here’s Parts Avatar’ easy guide that’s going to help you smoothly crack the code P0620. This generic powertrain code signals at fault detected in the generator control circuit. The PCM or one of the other supporting control modules are in charge of detecting the fault and so they consequently detect the fault. These control modules widely range from the alternative fuel control module, the body control module, the anti-lock 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 etc. (but are not limited to these).

The PCM plays the role of monitoring the vehicle’s generator through a generator turn-on signal circuit, permitting it to turn the generator off and on. When the generator needs to be turned on, the PCM directs a five-volt signal with the help of the generator turn-on signal circuit to the voltage regulator. As it does so, it allows the voltage regulator to start monitor the generator field circuit. When the generator is turned on and it starts functioning, the voltage regulator can start controlling the generator output independent of the PCM. During some of the operating conditions, the PCM can turn off the five-volt signal therefore turning off the generator too.

The PCM is also equipped with fault-detection circuitry to control these operations. If any unusual voltage or any other problem is detected, it cuts or reduces the power. And, it is only then it stores the code P0620.

What causes this problem with the Generator Control Circuit Malfunction?

• A possible fault in the PCM
• A PCM programming error
• The generator control circuit open or shorted
• A failure in the general assembly
• Inadequate control module ground

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It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0620 here:

Common Symptoms

Sometimes, the symptoms may contain a discharged battery, issues with the drivability, harsh shifting, decreased fuel economy, the engine may not work or run rough at idle, declining or bad acceleration, a stored trouble code, and probably an illuminated service engine soon lamp. If this code sets up, and you don’t see a service engine soon lamp illuminated, the code appears as pending.

• Complications with the engine drivability
• Engine halting while idling
• At times, delayed engine cranking (particularly when cold)
• Other various codes stored

Here are some ways with the help of which you will be able to correct the OBD Code P0620

• All the wires or other electronic parts functioning out of order should be replaced
• The technician is required to investigate the vehicle, including testing the unsound and stalled electronic parts. It is essential for the technician to perform a voltage test on an number of parts, along with testing both the battery and alternator. The technician is required to narrow down the range of viable issues, and then advice you on your next step while treating and performing the diagnosis
• The generator should be restored or mended
• Change or repair the PCM

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Here are some steps which you should follow in order to diagnose this P0620 fault code:

Using an OBD-II scanner the technician should check the trouble codes the vehicle has stored. Next, the generator needs to be checked for any signs of any poor connection or defect that may have led to a misread of the voltage. All the multiple circuits linked with the generator should be inspected too. All the wires associated with this component along with the connectors should also be inspected and tested. If everything else is checked out and tested, next the technician needs to check the PCM to ensure it didn’t store the code incorrectly.

Common Mistakes When Diagnosing the P0620 Code

To accurately diagnose this problem can often be a tedious task, which is why it is imperative that the technician should not directly conclude assuming the PCM to be at fault. So, in order to ensure an exact diagnosis and to check whether if the fault lies in the PCM or not, the vehicle should be test driven and all the codes should be cleared to see if returns back.