What are the reasons why the Roewe 550 plastic key cannot open the car door?
3 Answers
There are several reasons why the Roewe 550 key cannot open the car door: Remote key battery is dead: The car's remote key battery is dead. When the key is running low on power, the key indicator light is dimmer than usual, the remote control distance becomes shorter, and you need to press it multiple times to successfully unlock, resulting in a decrease in the remote control's signal transmission capability, and the car cannot sense the signal. You can purchase a button battery to replace it yourself, or go to a 4S store for replacement. You can also use the mechanical key to open the car door. Develop the habit of regularly replacing the battery and keeping spare batteries in the car. Insufficient battery voltage: The car's battery voltage is insufficient or the battery is dead. When the car battery is dead, the electronic control system fails, and the car remote key cannot open the door. Charge the battery. Problem with the key chip: There is a problem with the car key chip. Damage to the car key's circuit board causes data loss, or static electricity on your hands when replacing the battery can burn out the circuit board. Although the remote control's red light is still on, during testing, there is no signal or data inside. It is recommended to directly replace the key.
I have encountered the issue of the plastic key for the Roewe 550 failing to unlock the door multiple times, with the most common cause being a depleted remote key battery. When the car key's battery is used for a long time, the voltage drops, weakening the signal transmission, and the door stops responding. Try replacing it with a new CR2032 battery, which can usually be bought at a supermarket for just a few dollars. Additionally, environmental interference should not be underestimated—for example, parking near a Wi-Fi router or high-voltage power lines can block the signal, causing the key to fail. If the key has been dropped in water or damaged from a fall, the chip might be broken and require replacement. Also, check the mechanical parts of the door lock, as insufficient lubrication or rust can cause it to jam. For a temporary solution, you can use the physical key to open the trunk, but make sure to visit a 4S shop promptly to diagnose the entire system. For regular maintenance, remember to periodically check the key’s battery level to avoid being caught off guard at critical moments.
When driving my Roewe 550, occasional key failures often stem from signal issues, particularly malfunctions in the keyless entry system. A depleted battery is the primary cause, but strong nearby interference sources like subway stations or charging piles' magnetic fields can disrupt transmission—stepping back and trying again may restore functionality. Aging internal circuit boards in the key are also common, with cracked plastic casings causing loose contacts that affect operation. Sometimes, the vehicle's anti-theft module may mismatch, requiring reprogramming to resolve. I recommend first testing with other doors: if multiple doors won't open, the issue may lie with the car's system. While replacing the battery is a DIY option, complex cases require professional diagnostics. Taking time to check these can save on tow truck costs.
