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What does BCU failure mean?

1 Answers

MacIris

07/29/25 5:15pm

BCU refers to a motherboard failure in the vehicle's battery management system. 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. The solution steps are: 1. Fault diagnosis: Based on symptom analysis, if the engine fails to start after stalling, it usually indicates a fuel system or ignition system malfunction. Turn the ignition switch to ON (II) position and check fuel pressure at 370kPa – normal reading confirms proper pressure. 2. Inspect ignition system: Examination reveals no high-voltage spark, confirming ignition system failure. 3. Activate ignition switch: First turn on the ignition switch, use a test lamp to check terminal #1 of the ignition coil connector. Unlit lamp indicates power supply circuit fault in ignition system. 4. Test ignition coil: Verify integrity of fuse #2 (15A) under instrument fuse box. After removing and testing the ignition coil, a faulty ignition coil relay is identified. 5. Replace sensor: Install new CKP sensor, clear DTCs using HDS, then reset ECM/PCM. Engine starts normally, indicating successful troubleshooting.

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