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What are the reasons for the automatic parking failure and hill descent control failure in Haval H6?

1 Answers

OJosephine

07/29/25 3:09pm

Automatic parking and hill descent control failure reasons are as follows: 1. Fault in PT-CAN related wiring or a certain node: Using a fault detector, it was found that the electronic parking control module (EPB) stored one current fault code, which is "U111281ESPCAN signal failure"; the body stability control module (ESP) also stored one current fault code, which is "U100104CAN passive error"; the engine control module (ECM) stored two historical fault codes, which are "U01018 Loss of communication with TCU" and "U012687 Loss of communication with SAS"; no fault codes were 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. 2. Poor internal circuit connection in the gateway causing low network voltage: Measuring the battery voltage, the voltage when the ignition switch was not turned on was 12.6V, the voltage when starting the engine was 10.9V, and the charging voltage was 14.3V, indicating that the battery is normal. Based on maintenance experience, it was decided to first check the network voltage of the SAS (airbag module). Disconnecting the SAS wire connector, the voltage on its terminal 2 (CAN-H) was measured to be 2.73V, and the voltage on terminal 3 (CAN-L) was 2.31V, which is normal. Subsequently, the SAS, ESP, and yaw rate sensor were replaced in sequence, but the fault persisted. Checking the electronic parking motor wire connector, there was no water ingress or poor contact. After re-securing CAN connector No. 1 and CAN connector No. 2, the fault was still not resolved. Measuring the voltage on CAN-H and CAN-L from CAN connector No. 1 (located inside the left rear C-pillar, connected to the ESP) was found to be 1.5V, which is low. Since the related wiring showed no abnormalities and the network voltage is provided by the gateway, it is suspected that poor internal circuit connection in the gateway is causing the low network voltage.

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