What does GCU-R fault mean?
2 Answers
GCU-R fault means relay sticking/short circuit or overload, just replace it with a new one. The following is a detailed introduction to automotive relays: 1. Function: The basic function of an automotive relay is to use small current to control large current operation as an "automatic switch". It plays roles in automatic regulation, safety protection, circuit conversion, switching, etc. in circuits. 2. Selection by usage environment: The usage environment conditions mainly refer to temperature (maximum and minimum), humidity (generally refers to the maximum relative humidity at 40 degrees Celsius), low air pressure (can be ignored below 1000 meters altitude), vibration and impact. In addition, there are requirements for packaging methods, installation methods, dimensions and insulation. Due to different materials and structures, relays can withstand different environmental mechanical conditions. Using beyond the product standard's specified environmental mechanical conditions may damage the relay. Select according to the equipment's environmental mechanical conditions or higher conditions.
My old car had a GCU-R fault issue half a year ago, which gave me a big scare! It turned out to be a faulty transmission control unit, causing the car to shift roughly or even fail to move. While driving, I suddenly felt the car shake violently a few times, and the dashboard warning lights flashed. I quickly pulled over to avoid a major transmission overhaul, which would cost at least several thousand yuan. This issue might occur due to circuit aging or software bugs, commonly seen in automatic transmission cars. During regular maintenance, it's important to check the transmission fluid and electronic systems frequently—prevention is better than cure. If you encounter such a fault, don’t hesitate; go to a professional shop immediately for a computer diagnosis—safety first.
