What is the reason for the Hill Descent Control malfunction indicator light illuminating in the Haval H6?

[Simon]

Haval H6 Hill Descent Control malfunction indicator light illumination causes and solutions are as follows: PT-CAN related circuit malfunction: Using a fault diagnostic tool to detect, the Electronic Parking Brake control module (EPB) stored 1 current fault code: "U111281-ESP-CAN signal failure"; the Electronic Stability Program control module (ESP) also stored 1 current fault code: "U100104 CAN passive error"; the Engine Control Module (ECM) stored 2 historical fault codes: "U01018 Lost communication with TCU" and "U012687 Lost communication with SAS"; no fault codes were stored in other modules. Low network voltage: Measuring battery voltage: 12.6V when ignition switch is off, 10.9V during engine start, and 14.3V charging voltage, indicating normal battery condition. Based on repair experience, decided to first check SAS (Supplemental Restraint System module) network voltage. After disconnecting SAS wiring connector, measured voltage at terminal 2 (CAN-H) as 2.73V and terminal 3 (CAN-L) as 2.31V, both normal. Subsequently replaced SAS, ESP and yaw rate sensor in sequence, but fault persisted. Inspected Electronic Parking Brake motor wiring connector, showing no water ingress or poor contact. After resecuring CAN junction connectors No.1 and No.2, test drive showed fault still not eliminated.