Why Can't the Trunk of Changan CS55 Be Opened?

[MaggieLee]

After parking without turning off the engine, you need to manually unlock it inside the car for someone outside to open the trunk. Here are some relevant details about the Changan CS55: 1. The body dimensions are 4500x1855x1690mm with a wheelbase of 2650mm. 2. The wheel and tire style features dual-color rims with specifications of 225/55-R18. 3. In addition to the traditional 1.5T engine, a 48V motor is installed at the front of the engine, paired with a 48V battery pack. The engine delivers a maximum power of 115kW (156 horsepower) at 5500rpm and a maximum torque of 225 N·m at 2000-4000rpm. The 48V motor provides a maximum power of 11.5kW and a maximum torque of 50 N·m. The 48V battery pack is located under the trunk floor with a capacity of 0.8kWh.

[MacJade]

I've had this headache too—suddenly not being able to open the trunk is really frustrating. First, try the simplest solution: check if the remote key fob battery is dead; sometimes a weak signal prevents it from opening. Then, make sure all car doors are unlocked—some vehicles require all four doors to be unlocked before the trunk can open. If there’s a mechanical keyhole nearby, try turning it forcefully with the key. Another possibility is that the lock mechanism is stuck—press down hard on the rear of the car a few times and try again, or have someone sit inside and pull the trunk release. If none of these work, it’s likely an issue with the lock motor or wiring, with a faulty motor being the most common culprit. Last time my car had this problem, I opened it up and found the linkage rod had come loose—just reattaching it fixed it. If you’re handy, you can remove the interior trim panel to inspect it yourself; otherwise, heading straight to the dealership is the easiest solution.

[JonathanAnn]

From a repair perspective, trunk failures to open often stem from mechanical component issues. The motor in the lock assembly is prone to burning out, and gear teeth disengagement is also common. Remove the interior trim panel and first spray some WD-40 on the lock mechanism to test lubrication effectiveness. Then check if the release cable is being pressed or torn by large items in the trunk. For power trunks, verify the circuit continuity between the control module and motor. Fuses require special attention - inspect them in the fuse box located on the driver's side. If the body control module isn't receiving unlock signals, it will fail; use a diagnostic tool to read trouble codes. In winter, watch for frozen latches - pouring warm water can thaw them. Finally, be warned that forceful pulling may bend support rods, creating more problems than it solves.

[DelJoanna]

Technical analysis requires understanding structural principles. The electronic lock core consists of an actuator motor + unlock signal chain. Use a multimeter to check if the motor connector voltage reaches 12V - interrupted wiring or controller failure can cause power loss. For signal sources, inspect the central control switch and BCM module - gateway transmission errors preventing trunk opening commands are common issues. For mechanical locks, check if the pawl spring is broken; apply grease if guide rails are sticky. Older vehicles may need cable tension readjustment due to slackness. Poor aftermarket part compatibility often causes interference, a frequently overlooked factor. Start diagnosis with a door module system reset.