2016 Mercedes-Benz GLC 300: engine failure

Filed Aug 3, 2024 · Engine · CA

When driving the car, the engine began to violently shake and fail. The engine ended up having a piston failure due to a small wrist pin and needed the entire engine block replaced. I was lucky that I was not on the freeway or in a more dangerous spot when the engine failed while driving.

Filed Oct 7, 2022 · Engine · MD

During normal highway driving, the check engine light energized in the display. At the same time, engine power was lost, and the vehicle could no longer accelerate. The Mercedes Benz dealership was less than a mile away, so I went directly there at a slow speed without damaging the engine. Upon inspection, the dealership found that the engine wiring harness was completely engine oil soaked and the oil drained down into the engine control unit (computer), causing loss of one of two turbochargers and loss of engine control and power. It is suspected that the oil originated from one or multiple of the camshaft sensors that are connected to the engine wiring harness. The engine oil traveled through the wiring harness and then completely soaked to engine control unit, which malfunctioned. If this happened while overtaking another vehicle or trying to avoid another, then I would have had a serious accident. I had insufficient engine power to avoid other cars and luckily was in the far-right lane to be able to exit the highway without an accident or damaging my engine due to the higher-than-normal rpms. The vehicle is currently at the dealership and requires a new engine wiring harness which may require removal of the engine to access and replace, a new engine control unit due to being engine oil soaked, and possibly a new turbocharger. This repair could cost well over $10,000 for parts and labor. The vehicle just had its annual maintenance service in September and no oil leak from the engine wiring harness was noted by technicians during the maintenance. The dealership continues to search and localize exactly where the oil originated but believes that either one or multiple camshaft sensors is the cause. The dealership does not know how long it will take to repair the vehicle due to the parts needed and the extent of labor that is required.

Filed Sep 28, 2022 · Engine, Transmission · IL

Piston 1 cracked while driving on the highway. My sibling was driving on the highway when the engine suddenly started misfiring and losing power because it lost compression on the piston that cracked. I was lucky enough that I have mechanic experience to replace all the damaged components myself and paid out of pocket. I was super fortunate that the cylinder walls did not get damaged when this happened thus not needing an entire engine replacement which would cost around $10,000 from mercedes. I had to go pick up a trailer from UHaul and go pick up the vehicle from where it broke down. Thinking about this from the perspective of a person who does not have access to rent a trailer, a vehicle to pull said trailer with, or the mechanic experience to fix the vehicle themselves, the cost to get this issue resolved would be much much more than it cost me.

Filed May 13, 2021 · Engine · 40,000 miles · NV

At 40,000 miles, one of the wrist pins snapped and the piston broke off. This caused complete engine failure and the whole engine needs to be replaced. This is the same problem that caused a recall with the 2015 model. The dealership is making me pay for the labor, but mercedes donated the engine (probably because they know it's their fault). So I'm wondering if there should be a recall on this model as well.

Filed Jul 4, 2016 · Engine, Steering · 14,000 miles · TX

I purchased my new vehicle dec 2015. I have had it in the shop 2 times for an estimated time of 3 to 4 weeks. 1st my steering mechanism locked up and wouldn't allow me to move my steerging wheel up or down. In or out. Then, at the same time, my car was shifting erratically. It would feel like it was in 5th gear, and then immediately drop to 1st gear. They couldn't find anything when they had this vehicle and they had it for about 5 days. Now, my engine blew. They stated via text message that the cam shaft broke and put a large hole in my engine block. Thank god it didn't come thru the front of the car and strike me. **I was driving my car, when I suddenly hear a loud bang, and my car immediately started smoking from the engine, and I could see I was loosing oil from my rear view mirror. I was about a block from my house. I couldn't excel very fast, but made it. It felt like the engine was on fire, so I pulled into my house by my hose, to hose the fire down. I didn't see a fire, just a lot of black smoke, so I pulled vehicle out in street so it wouldn't leak oil in my driveway. I contacted mercedes to report the problem. I requested a new vehicle, which they are refusing.

Filed Apr 22, 2016 · Engine, Fuel system · 1,450 miles · NY

Three weeks after buying the glc300 4matic the engine misfires, got stranded in AC new jersey, the car was at the dealer for 3 weeks, they replaced all fuel injector/coils and it kept happening, then the fuel module got replaced and it ran fine for 4 weeks and the problem came back, got stranded in boston, the car was at the dealer for 2 weeks, this time they replaced the engine control unit (today 4-22-16), I'm picking it up tomorrow. I own the car for 12 weeks and only been able to drive it 7 weeks, so disappointed in mercedes benz.