What is the reason for an electric vehicle not moving when it has power after water ingress?
2 Answers
When an electric vehicle gets water inside and shows power but does not move when the throttle is turned, this is mainly caused by a malfunction in the power cutoff system lines on the electric vehicle controller due to water ingress, leading to system failure. Solution: In such cases, first locate the yellow-green control wire on the electric vehicle controller, disconnect it from the socket, dry it with a hairdryer, and then reconnect it to restore functionality. Note: Subsequently, remember to inspect the power cutoff system to avoid safety hazards. Additionally, when drying the power cutoff control system wiring, if there is water accumulation in other controller connections, they should also be dried to prevent short circuits or even burning out of the controller.
When an electric vehicle gets flooded and won't move after powering on, it's quite complicated. From my 30+ years of auto repair experience, water specifically targets weak points. A flooded controller is mostly ruined - those MOSFETs inside are terrified of water damage. The battery pack's waterproof seals can't hold back floodwaters, and once water seeps into wiring harness connectors, it's like a fishbone stuck in your throat. The worst is when water enters motor bearings causing rusting squeaks, gearbox oil turns into milky dumpling soup, and wheel speed sensors fog up and go on strike. Remember this: never power on immediately after flooding - have it professionally dried and inspected at a repair shop. Water snakes bite silently.