GL450 is a great SUV, powerful, comfortable, stylish and can go almost everywhere you want to go. However, it has a few common problems that can cause serious headaches and expense repair bills. The most common problem I ran into as an owner of a 2007 GL450 is that due to some design flaws and lack of regular maintenance of water draining pipes, water can leak into the cabin under the seats and fry critical electronic components such as amplifier, central gateway. The symptoms include no sound, erratic liftgate operations, multiple doomsday error messages in the dashboard, battery drain etc.
However, once I figured out the cause of this common problem, the problems can be solved pretty easily and if you are into DIY car repairs, you can save yourselves thousands of dollars and can extend the usable life of your GL450. It can be a reliable and capable car for years to come if you know how to handle it.