Why can't the Tiguan's trunk be opened with the key?
3 Answers
Reasons why the Tiguan's trunk cannot be opened with the key: the car key battery is dead, the car key is malfunctioning, or the opening method is different. Replacing a dead battery can be done by yourself: When the key becomes unresponsive during use, the owner can purchase a battery from a store and replace the old one. Solution for key malfunction: If the indicator light on the key is functioning normally but the vehicle does not respond, the owner can use the mechanical key to open the door manually and then drive the vehicle to a 4S shop for inspection. Different opening methods: Apart from the trunk switch malfunctioning or having a special opening method, different car models actually have various ways to open the trunk.
I'm a car tech enthusiast and often research similar issues. If the Tiguan's trunk won't open with the key, there could be several reasons: the key fob battery is low on power, resulting in weak signal that prevents the trunk from receiving the unlock command; the trunk lock mechanism itself might be jammed or corroded, requiring manual inspection; or there could be an electronic system malfunction, such as a blown fuse controlling the trunk. I've encountered this before - first try replacing the key fob battery. If that doesn't work, check if the interior trunk button functions, or test the signal with a spare key. Additionally, the Tiguan features a smart key system that can occasionally be interfered with by nearby electronic devices, like areas with strong mobile signals. For safety, avoid forcing the lock open to prevent structural damage. It's recommended to visit a professional workshop for circuit diagnostics using specialized equipment, as they can quickly pinpoint the issue.
As a frequent driver of the Tayron, I find this issue quite common. Last time my key also malfunctioned, and it turned out the trunk latch was slightly stuck, possibly due to dust accumulation affecting the mechanical action. You can first try pressing the trunk unlock button inside the car—if it opens manually, it indicates a key issue. The key battery might be running low, so try replacing it with a new CR2032 battery and test again. Also, check the trunk-related fuse in the fuse box to see if it’s blown. In humid weather, the latch is prone to rust, so applying some lubricant might help. Don’t forget interference sources—nearby electronic devices can block the signal. If none of these steps work, consult a mechanic promptly to avoid potential hazards while driving.
