What 56 owners told NHTSA about the 2020 Mercedes-benz GLB

I have a passenger malfunction with airbags warning coming. I also just experienced getting gas. My milage counted down to zero which it never has before and my engine light came on. I went and got gas 3 times spending around $70 and my gas mileage still says 0 and my engine light is on.

NHTSA ODI 11735064

Diagnostics performed and found electrical/component fault and possible wire damage to fuel pump. NECC to drain tank and inspect replace fule pump if necc. Oringally took one week prior and diagnostics led to the possiblility that the cylinder head was malfunctioning, which was a manufacturing defect and covered under an extended warranty, but now advised otherwise. Quote $2200.00. Mileage on vehicle 23,660.

NHTSA ODI 11726066

The vehicle was operating normally the previous night. We drove it and parked it in the driveway that evening, and it was not used again after that. The following morning, we started the vehicle to allow it to warm up and then returned inside the house. Approximately 10 minutes later, we discovered the vehicle was on fire, with flames coming from under the hood. We immediately called 911. The fire department responded and was able to extinguish the fire; however, the vehicle was completely destroyed, and part of our home sustained fire damage. There were no prior issues with the vehicle. We had purchased it in September 2025, and it was in excellent condition. This incident could have resulted in far more serious consequences had it occurred while the vehicle was in motion or if emergency responders had not arrived as quickly as they did.

NHTSA ODI 11717145

Car constantly cuts out and loses power as well as occasionally shuts off for no reason. Causing very hazardous driving conditions. I have noticed that this is a common issue stated in online forums with this particular car as well. It is more times than not an issue with the engine head and valves.

NHTSA ODI 11617187

The engine made a knocking sound and i pulled over on the side of the road took the car to MB dealership to get the recall fixed but i was told the recall cannot be fixed until the engine is fixed. MBUSA refuses to replace the engine even though it is fully covered under warranty. Thus because i cannot get a recall done for my safety unless i get an engine replaced. This is absolutely horrible. MB knows they produced a bad engine and are forcing us to pay out of our pocket then they will fix the recall on the car.

NHTSA ODI 11594846

Engine failure. Engine has no compression which is causing injection fueler to fail. The head engine has gone bad at 50,000 miles. Head engine must be replaced and is on back order per Mercerdes Benz. After research on the issue I’ve noticed the Year/Make/Model this is issue is common at the 40k-50k mile mark. This is a manufactured issue that Mercerdes needs to fix if so common within the car and also unsafe. Not okay for a new car to have engine failure this early

NHTSA ODI 11575249

ON 3/23/2021, MY GLB 250 STARTED EXPERIENCING ELECTRICAL AND ENGINE ISSUES AFTER I HAD BEEN STOPPED AT A RAILROAD CROSSING FOR 15 MINUTES WITH THE ENGINE RUNNING AND THE CAR IN PARK. ONCE THE TRAIN PASSED AND I WAS ABLE TO DRIVE, MY INSTRUMENT PANEL STARTED LIGHTING UP WITH EVERY POSSIBLE WARNING LIGHT AND ADDITIONAL WARNINGS THAT SAID TO NOT SHIFT GEARS AND GO TO DEALER IMMEDIATELY. I DROVE APPROXIMATELY 1 MILE AND STOPPED AT A STOP LIGHT, AT WHICH TIME ALL WARNINGS CONTINUED TO GO OFF. I COULD NOT TURN THE CAR ON OR OFF, COULD NOT SHIFT INTO ANY GEAR, THE STEERING WHEEL WAS LOCKED. THE INSTRUMENT PANEL KEPT FLASHING AND SEEMED LIKE THE CAR WAS TRYING TO REBOOT. AS I WAS ON THE LINE WITH MERCEDES ME TO GET A TOW TRUCK, THE CAR WAS FINALLY ABLE TO SHIFT INTO DRIVE AND I WAS ABLE TO DRIVE TO A NEARBY PARKING LOT. THE CAR SEEMED TO BE OPERATING FINE BUT THE YELLOW CHECK ENGINE LIGHT WAS STILL ON. ON MY 10 MILE DRIVE TO THE DEALERSHIP THE CAR STARTED EXPERIENCING THE SAME ISSUE EVERY TIME I HAD TO STOP AT A STOP LIGHT. ONCE AT THE DEALERSHIP THE CAR CONTINUED TO THROW ERROR MESSAGES ON THE DASH.

NHTSA ODI 11404564

CHECK ENGINE LIGHT AT 1500 MILES

NHTSA ODI 11374667