How to repair the P0620 trouble code?

[Edith]

p0620 trouble code repair method is as follows: 1. First, it is necessary to use a dedicated diagnostic computer to read the engine trouble code, clarify the specific meaning of the trouble code, and analyze the relevant data stream to determine the corresponding fault point and then make an accurate judgment and elimination. 2. Therefore, it is recommended that the owner go to a specialized repair shop for a computer inspection of the engine control system and take corresponding repair measures based on the actual inspection results. Here is some introduction about the P0620 trouble code: 1. The electronic control unit (ECU) controls the generator through the generator activation signal circuit. 2. If the electronic control unit (ECU) detects that the generator activation circuit voltage is incorrect, the P0620 trouble code will appear.

[OwenDella]

I just dealt with the P0620 trouble code, which indicates an issue with the generator control circuit. The most common causes are a faulty alternator or wiring problems. From my experience, first check if the belt is loose, worn, or broken—just start the engine and listen for unusual sounds. If the belt is fine, test the battery voltage: when the engine is running, it should be between 13.5 and 14.5 volts. If it's below 13 volts, the alternator isn't generating power. Next, inspect the fuses, especially the large ones in the engine compartment fuse box, like the 50-amp fuse—replacing a blown one costs less than 20 bucks. If everything checks out, the issue might be a failed control module inside the alternator or corroded wiring. Alternators typically last around 80,000 km. Replacing a faulty one costs about 800 to 1,000 yuan including labor—don't wait until it drains the battery and leaves you stranded. For maintenance, regularly clean battery terminals to prevent rust and extend component life. Safety tip: Avoid touching hot engine parts during testing, as unstable voltage can cause injury. In short, tackle simple issues yourself, but for complex problems, visit a repair shop for a quick fix.

[McAaliyah]

My car once threw a P0620 code, causing the headlights to flicker, and it turned out to be an alternator issue. I recommend starting simple: pop the hood and check if the wiring and connectors near the alternator are loose or corroded—clean them with a damp cloth. If that doesn’t help, inspect the fuse box, usually near the driver’s footwell, for a 20-amp fuse labeled "Alternator." If blown, just spend a few bucks on a replacement. I’ve done it myself—easy. But if the alternator is truly faulty, it won’t charge the battery, which will drain completely, leaving you stranded with hefty tow fees. So don’t panic—try these steps first, and if they fail, get to a shop for a voltage test ASAP. Also, listen for belt squealing while driving; it signals tension adjustment. For prevention, avoid short trips to keep the battery charged and healthy.

[MarcusLynn]

When dealing with the P0620 trouble code, I usually start with the electrical circuit. If this code appears, it indicates a failure in the generator control circuit, which may cause flickering lights or difficulty starting. My approach is straightforward: I use a multimeter to check the battery voltage—if it's below 13V after starting, the issue is likely with the generator or wiring. Next, I inspect whether the generator's L or IG terminal circuits are properly connected to the ECU interface, using a voltmeter to check for any short circuits. Blown fuses are the most common culprit, and replacing them as per the manual usually fixes the problem. Aging relays can also be the cause, and replacing them is a cost-effective solution. If the generator is faulty, unstable voltage can damage electronic components, so always disconnect power during testing to prevent risks. Regularly cleaning the terminal connections helps reduce corrosion-related failures.