How to repair the P0620 trouble code?
2 Answers
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.
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.
