What Causes Abnormal Charging System in BMW 5 Series?
2 Answers
Abnormal charging may be caused by issues such as battery leakage, unreliable charging circuit connections, or charger damage. Below are related fault descriptions: 1. Battery leakage fault symptoms: Common leakage phenomena include poor sealing between the upper cover and base tank, or cracks in sealing adhesive due to collisions leading to leakage. Other manifestations include acid seepage from valve caps, leakage at terminal connections, and acid seepage from other parts. 2. Symptoms of battery charging failure: Check whether the charging circuit connections are secure, whether wires and plugs have proper contact, whether sockets and plugs show arc burn marks from sparking, and whether there are any damaged or broken wires in the circuit.
I've been driving a BMW 5 Series for many years and once encountered a charging system alarm. That time, the vehicle display showed a warning light, which really worried me. Common possible causes include a loose charging port, debris blocking the slot, internal faults in the onboard charger, or short circuits in the high-voltage wiring. I checked the external charging gun connection and found no issues. Later, at the 4S shop, a diagnostic tool revealed that a software update was needed. Never force charging to continue when such issues arise, as it may damage the battery or cause more severe wiring problems—safety first. Luxury cars like BMW have highly sensitive systems, so it's advisable to regularly clean the charging port during maintenance, avoid exposure to humid environments, and schedule professional battery health checks periodically.
