2017 Mercedes-Benz GLS 450 Engine Problems

“I drove up and down the western united states on highways and city streets. I drove 16 hours a day for about 1 week. I received a check engine light with a warning that there was a small evap leak. After being serviced this warning did not appear again. I believe the thresholds were updated to ignore small evap leaks. Around october 28, 2019, I noticed the floor board of my vehicle overheating. I also detected more exhaust fumes entering the cabin. I believe the catalytic converters are less effective and a blockage is causing more exhaust to leak from the emissions system. …”

“Vehicle is only 3 weeks old. A faulty engine wire harness caused the vehicle to cease operating in traffic and put my family in a potentially life threatening situation. Mercedes did not replace but only repaired the wire, which we were told was not assembled correctly and was pinched in a bracket and subsequently chafed, which can potentially still cause a life threatening engine malfunction during normal operation. Mercedes is not willing to replace the engine harness wire, nor replace the vehicle. I fear for the safety of my family.”

“On 8/20/2026 I had a vacuum leak from the intake manifold and crankcase hoses repaired at a Vic's Bimmer Shop in the city of Lancaster California. This included the replacement of the oil separator breather on the engine. I drove my Mercedes Benz 2017 GLS450 less than 100 miles and the engine lost power and suddenly turned off. I was able to pull off onto the side of the freeway and then I saw smoke coming from under the hood and my wife and I exited the vehicle, called the fire department and the car burned completed on the side of the freeway and is a total loss. …”

“On July 23, 2025, I drove my Mercedes-Benz GLS 450 to a medical appointment. After arriving, I parked near the valet station, turned off the car, and went inside to check in at LabCorp. Within two minutes, witnesses reported black smoke from the hood — followed by a violent explosion that shook the office building and triggered a multi-unit response from local fire and police departments. When I came downstairs, my vehicle was engulfed in flames. The front end was completely destroyed. Mercedes-Benz USA sent an investigator on September 8, 2025 to examine the wreck. …”

“Our car, Mercedes GLS 450, caught on fire after pulled into the garage from a short drive on local streets, which resulted a total loss on our house. After pulling into the garage, the home link didn't work when tried to use it to close the garage door. Upon coming out of the car, smoke came out from under the hood and soon after it became flame. We attempted to extinguish the fire with a fire extinguisher as it appeared with hood still closed and fire immediately came back. By the time the firefighters came, there was a full fledged fire. …”