How to Repair the Low Coolant Level Fault in BYD Tang DM?
2 Answers
Repair Process: 1. Upon arrival at the shop, there were no fault symptoms present. The VDS diagnostic tool was connected, and no fault codes were detected during the vehicle scan. According to the circuit diagram, the coolant level signal is transmitted to the instrument panel via the GJB05 connector. To minimize vehicle disassembly steps, a segmented measurement approach was adopted. The B26 connector showed no pin retraction and was properly connected. Measurements confirmed good grounding for B26-1, and continuity was verified between B26-3 and BJG05-10. 2. During the inspection of the BJG05 connector, water stains were found at the connector beneath the right A-pillar, and the GJB05 connector pins were corroded. After treating the connector and drying the water stains, a test drive confirmed the fault was resolved. Repair Summary: 1. For intermittent faults, it is essential to combine the circuit diagram and control principles to aim for a one-time fault resolution. 2. For new energy vehicles, when encountering low coolant levels, it is also necessary to consider issues related to the coolant sensor signals involving the battery pack and motor controller.
I noticed the coolant level in my BYD Tang DM was low. Generally, I first park and let the engine cool down to avoid burning myself. Then, I open the hood and locate the MIN and MAX marks near the coolant reservoir to check the actual fluid level. If it's low, I inspect the bottom for any obvious leaks, such as wet spots around the radiator or pipe connections, as these are common issues. I've tried topping it up with the same brand of coolant—remember, BYD recommends using the specified type, as other types might corrode the system. After adding, I start the car and let it idle for a few minutes to allow the system to vent, then check if the level stabilizes. If it keeps dropping repeatedly, it's time to visit the shop for a professional inspection of the water pump or internal issues. After all, the thermal management in hybrid systems is complex, and neglecting it could lead to serious overheating. I always make it a habit to check the coolant level during regular maintenance to prevent problems before they arise.
