What does BCU failure mean?
2 Answers
BCU refers to the mainboard failure in the battery management system of a vehicle. BCU is Baidu's dedicated computing platform for autonomous driving, featuring two fundamental capabilities—information security and cloud updates—along with three core AI modules: high-precision positioning, environmental perception, and planning decision-making. BCU failure diagnosis: Based on the symptoms, if the engine fails to start after stalling, it is generally due to a fuel system or ignition system malfunction. Turn the ignition switch to the ON (II) position and check the fuel pressure, which should be 370 kPa under normal conditions. Solutions for BCU failure: Replace the CKP sensor, use HDS to clear the fault code, and then reset the ECM/PCM. The engine should start normally, and the issue will be resolved.
I've encountered this issue before. The BCU, or Body Control Unit, is essentially the brain of the car that controls components like windows, door locks, and lights. If it malfunctions, you might experience random window failures, sudden headlight outages, or even a blacked-out central display. From my repair experience, common causes include wiring shorts or software glitches, sometimes triggered by water intrusion during rain. For solutions, first use an OBD scanner to read error codes and confirm BCU issues—this saves time on unnecessary troubleshooting. Safety first: driving with malfunctioning windows is extremely dangerous, so pull over immediately to check fuses. If that doesn't work, visit a dealership for module replacement. These electronic components can be costly to repair (at least a few hundred dollars), so maintain interior dryness for prevention. Remember: addressing minor issues early prevents major headaches.
