What does the Great Wall Haval H6 hill descent control failure mean?
2 Answers
h6 hill descent control failure may be caused by a fault in the PT-CAN related wiring or a certain node, or a virtual connection in the internal circuit of the gateway leading to low network voltage. The engine control module (ECM) has stored 2 historical fault codes: "U01018 communication with TCU" and "U012687 communication lost with SAS"; no fault codes are stored in other modules. Analyzing the fault codes, it is inferred that there is a fault in the PT-CAN related wiring or a certain node. Relevant information: When the slope of the steep hill is too large and engine braking is insufficient to maintain the speed limit, HDC can use the ABS system to initiate intermittent braking when necessary, reducing the increasing speed to maintain a stable and safe downhill speed. If the driver needs to steer to avoid obstacles during the downhill process, the HDC system will also detect it and further reduce the speed limit to 64km/h to ensure full control of the vehicle. It is worth noting that whether the ABS system operates here depends on whether the speed exceeds the speed limit, which is different from the traditional ABS anti-lock braking function that activates when the driver brakes to slow down and the tires are about to lock.
Last time I was driving a Great Wall Haval H6, the hill descent control suddenly reported a malfunction. Essentially, the car wouldn't automatically slow down when going downhill, making it feel like it was coasting too fast and prone to losing control. When the warning light came on, I panicked. After checking, possible causes included the sensor being covered by mud, poor electrical contact, or the software needing an update. Not addressing such issues promptly can be dangerous, especially when driving in mountainous areas or during rainy weather. It's best not to tamper with it yourself; instead, head straight to a 4S dealership for a computer diagnosis. Usually, clearing the fault code or replacing a sensor can resolve the problem. Remember, regular maintenance can help reduce the occurrence of such issues.
