Haval H6 Hill Descent Control Malfunction and Failure to Start?
3 Answers
1.5-liter turbocharged engine has a maximum power of 110 kW, a maximum torque of 210 Nm, a maximum power speed of 5600 rpm, and a maximum torque speed ranging from 1800 to 4400 rpm. This engine is equipped with VVT technology and uses an aluminum alloy cylinder head and block. The 1.5-liter turbocharged engine has a maximum power of 110 kW, a maximum torque of 210 Nm, a maximum power speed of 5600 rpm, and a maximum torque speed ranging from 1800 to 4400 rpm. This engine is equipped with VVT technology and uses an aluminum alloy cylinder head and block. This engine is paired with either a 6-speed manual transmission or a 7-speed dual-clutch transmission. The 2.0-liter turbocharged engine has a maximum power of 145 kW, a maximum torque of 345 Nm, a maximum power speed of 5500 rpm, and a maximum torque speed ranging from 2000 to 3000 rpm. This engine is equipped with direct fuel injection technology and uses an aluminum alloy cylinder head and a cast iron block. This engine is paired with a 7-speed dual-clutch transmission. Dual-clutch transmissions offer fast gear shifts and high transmission efficiency, making them well-suited for use with small-displacement turbocharged engines. The production cost of dual-clutch transmissions is also relatively low, which is why many automakers prefer to use this type of transmission.
Encountered a similar case in the repair shop a few days ago. When a Haval H6 simultaneously exhibits hill descent control failure and failure to start, it's most likely an electrical system linkage issue. If there's a problem with the sensors in the vehicle stability system, the car will forcibly enter protection mode and refuse ignition. I've personally seen an H6 trigger both faults simultaneously due to water intrusion in the wheel speed sensor. Another possibility is a blown main fuse in the fuse box, as hill descent control requires considerable current. First, check the main fuse box located below the steering wheel's lower left corner - there's a 40-amp brown fuse specifically for the vehicle stability system. Additionally, poor contact at battery terminals can falsely trigger fault codes preventing startup. Last week, a customer had this exact situation caused by rodents chewing through the chassis wiring harness. If all else fails, the most reliable solution is visiting a 4S dealership to connect diagnostic equipment - reading the ESP module data stream will provide clear answers.
I've repaired three Haval H6s with this issue, and the symptoms generally fall into three categories: First, poor contact in the Body Control Module (BCM) after water ingress, which is particularly prone to acting up on rainy days. Second, interruption of the brake light switch signal—when the dashboard shows a hill descent control fault, the vehicle's computer may interpret it as a brake system failure and directly lock the starting circuit. Third, the wiring harness of the control module under the steering wheel gets caught and loosened by the floor mat. A temporary fix is to repeatedly disconnect the power for over five minutes and try again, by removing and reattaching the negative terminal of the battery, essentially forcing a hard reboot of the car. If there's a buzzing noise when releasing the electronic parking brake, it's likely that the rear wheel EPB parking module is stuck, affecting the start-up. Remember to have the mechanic check the power connector of the ABS pump—someone in the car owners' group shared an experience where corrosion in this connector caused the car to fail to start.
