What 133 owners told NHTSA about the 2015 Mercedes-benz Glk-class

The DEF exhaust system has failed. It was replaced before under a recall. The warranty was previously extended on the system but I am outside of the mileage window but inside of the time window. I have $6000 in repairs so far and am trying to get assistance. I have been dealing with issues since October 2024

NHTSA ODI 11640604

DRIVING 25 MPH AROUND A CURVE WHEN MY CAR LOST CONTROL, DESPITE MY BEST ATTEMPTS MY CAR WOULD NOT ALLOW ME TO TAKE CONTROL OR TO BREAK. MY CAR WENT FROM 25 MPH TO 60 MPH THROUGH A TWO LANE TRAFFIC STREET, FORCING ME TO SWERVE IN AND OUT OF TRAFFIC MERELY MISSING SIX CARS AND A SEMI TRAILER TRUCK, SPINNING MY CAR AROUND TWICE AND FACING THE OPPOSITE DIRECTION OF TRAFFIC.

NHTSA ODI 11376095

WHILE DRIVING ON AN INTERSTATE HIGHWAY DURING RUSH HOUR MY MERCEDES GLK SUDDENLY SLOWED DOWN TO ABOUT 30MPH. THE CAR WAS UNRESPONSIVE AND WOULD NOT ACCELERATE. A .MESSAGE THAT SAID 'INOPERATIVE SEE OWNERS MANUAL' APPEARED. WE TURNED OFF THE CAR AND IT STARTED UP WITHOUT PROBLEM. WE WERE VERY FORTUNATE THAT WE WERE ABLE TO PULL OVER, AS THERE IS REPAIR WORK BEING DONE AND PART OF THE HIGHWAY DIDN'T HAVE A SHOULDER. WE WERE LUCKY THAT WE WERE NOT HIT. THIS IS VERY DANGEROUS AND NEEDS TO BE CORRECTED BEFORE SOMEONE GETS HURT.

NHTSA ODI 11079872

TL* THE CONTACT OWNS A 2015 MERCEDES BENZ GLK250. WHILE DRIVING AT AN UNKNOWN SPEED, THE ENGINE WARNING LIGHT ILLUMINATED. THE FAILURE RECURRED SEVERAL TIMES. THE VEHICLE WAS TAKEN TO THE DEALER THREE TIMES. THE TECHNICIAN WAS UNABLE TO DUPLICATE OR DIAGNOSE THE FAILURE. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 500.

NHTSA ODI 10789656

DRIVING BACK FROM VACATION LAST SATURDAY, ON THE PENNSYLVANIA TURNPIKE, OUR MOTOR SHUT ITSELF OFF. MY HUSBAND WAS DRIVING, USING CRUISE CONTROL, GOING STRAIGHT, WITH THE "ECON" BUTTON TURNED OFF. LUCKILY TRAFFIC WAS LIGHT AND WE WERE ABLE TO COAST TO A STOP OFF THE RIGHT SIDE OF THE FREEWAY WITHOUT MISHAP. MY HUSBAND TURNED THE KEY OFF, WAITED ABOUT A MINUTE, THEN STARTED THE ENGINE AGAIN. THE "CHECK ENGINE" LIGHT CAME ON, BUT OUR MOTOR STAYED ON, AND WE DROVE HOME WITHOUT ANY MORE PROBLEMS. I MADE AN APPOINTMENT WITH OUR M.B. DEALER TO HAVE THE CAR SERVICED ON THIS COMING FRIDAY, OCT. 2ND., EXPLAINING WHAT HAD OCCURRED. THE CHECK ENGINE LIGHT WENT OUT SOMETIME ON MONDAY, SEPT. 28TH. AND HASN'T COME ON AGAIN, BUT IF THE ENGINE DIES AGAIN AT A MORE INOPPORTUNE TIME IT COULD CAUSE SERIOUS, POSSIBLY FATAL, CONSEQUENCES. I AM VERY CONCERNED. BEFORE THIS FAILURE OUR CAR'S MOTOR HAS RUN SMOOTHLY WITH NO PROBLEMS. HOPEFULLY OUR DEALER WILL BE ABLE TO IDENTIFY THE CAUSE WHEN THEY CHECK OUR ONBOARD COMPUTER.

NHTSA ODI 10778870

MESSAGE DASHBOARD INDICATOR (MDI) READ "INOPERATIVE. SEE OPERATOR'S MANUAL" WITH OTHER MALFUNCTION LIGHTS INCLUDING CHECK ENGINE LIGHT (CEL). TURNED CAR OFF AN ON AND ONLY THE CEL REMAINED. ALSO, THERE WAS A RECURRING TICKING NOISE THAT PRECEDED AFOREMENTIONED ISSUES THAT I ALSO REPORTED. DEALERSHIP REPAIRED LOOSE PIN IN ENGINE ECU (P045100) FOR THE CEL AND REPLACED A HIGH PRESSURE FUEL PUMP FOR THE TICKING NOISE. TICKING NOISE CONTINUED AND VEHICLE RETURNED TO DEALERSHIP WHERE THEY DETERMINED THE TICKING NOISE WAS RELATED TO THE DASH/RADIO/AC CONTROL PANEL/DASH TRIMMING MOVING AGAINST EACH OTHER BUT INDICATED THAT THIS WAS NORMAL (3778 MILES) . THE ISSUE RELATED TO THE MDI AND CEL OCCURRED AGAIN ON 01/25/2015. AS WITH THE INITIAL OCCURRENCE, THE CEL REMAINED ON AFTER RESTARTING THE VEHICLE. THE VEHICLE SEEMED TO STALL WHILE I WAS DRIVING 65 MPH ON A MAJOR HIGHWAY WHEN DRIVING A FEW HOURS LATER. FORTUNATELY, I WAS ABLE TO EXIT THE HIGHWAY. I NOTICED THAT THE CAR DROVE VERY SLUGGISHLY. FOR EXAMPLE, THE CAR WOULD HARDLY ACCELERATE REGARDLESS OF HOW FAR DOWN I PRESSED THE ACCELERATOR AFTER ATTEMPTING TO CONTINUE FROM THE RED LIGHT. I RECALLED THIS HAPPENING WITH THE FIRST OCCURRENCE BUT THEN THOUGHT IT WAS SOMETHING I WAS DOING INCORRECTLY. THE ENGINE LIGHT REMAINED ON AFTER RESTARTING THE VEHICLE AND AS I DROVE APPROXIMATELY 10 MINUTES TO MY FINAL DESTINATION. THE ENGINE LIGHT DID NOT COME ON WHEN I STARTED THE CAR AGAIN AT 10:40 AM (4017 MILES). OUT OF CONCERN, AND ADVICE FROM FAMILY MEMBERS GIVEN WHAT HAPPENED WHEN DRIVING AT A HIGH SPEED, I TOOK THE CAR TO A LOCAL AUTO STORE TO SEE IF THEY COULD DETERMINE ANY FAULT CODES. A CODE OF P2138 WAS RETURNED. *TR

NHTSA ODI 10678793