Total Complaints
8 filings
MERCEDES-BENZ GL550 · model year
8 NHTSA complaints for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 2015MERCEDES-BENZGL550 carries 8 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 0 crashes, 3 fires, 0 injuries, and 0 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.
Component-level analysis is where model-year complaints become actionable: the top complaint category for the 2015 GL550 is engine with 4 filings, followed by unknown or other (2) and structure:body (1). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.
NHTSA currently has 15 investigation files overlapping the 2015 GL550. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.
Total Complaints
8 filings
Crashes Reported
0 reports
Source
NHTSA ODI
Federal complaints database
At or below the fleet median complaint volume.
| Component | Count |
|---|---|
| ENGINE | 4 |
| UNKNOWN OR OTHER | 2 |
| STRUCTURE:BODY | 1 |
| SEATS | 1 |
See attached document for complaint
My 2015 GL550 has 90k miles on it and is city driven, on 09/11/2023 when I was trying to pull out onto a main rd my suv hesitated and the check engine light came on, luckily traffic wasnât heavy at the time so I wasnât in any accidents. I called and was able to get my suv into my local Mercedes dealership for an inspection. When the suv was dropped off the check engine light had gone off but when the service center pulled up the codes it showed both turbos were bad and have to be replaced. This isnât something that should happen to a vehicle that is regularly serviced only at Mercedes service centers, isnât 10years old yet, never wrecked, and has less then 100k miles on it. If this had happened with heavy traffic or any other situation it could have caused a serious wreck. My suv is currently at the dealership having both turbochargers replaced at a cost of $12,000 out of pocket. I feel that Mercedes needs to look into the turbochargers used in their vehicles.
Upon receipt of vehicle, when the weather was nice, a rattle in the engine compartment appeared to take place intermittently. Upon diagnosis by a dealership, intermittent was confirmed to take place on a cold start, and not intermittently. Upon further research, it was found the rattle is related to a manufacturer's defect with the timing chain tensioner(s) and their interaction with the valves. My safety was put at risk substantially. I live in the cold upper midwest. Every start of the vehicle is a cold start, and if I risk damaging my engine at any given hour, during the dead of winter, with little to no available funds, I am at risk of hypothermia, starvation, even death. The problem, as noted in paragraph one has been reproduced by a dealer. The vehicle has not been inspected by the manufacturer in full, but the issue is known by Daimler since 2013 for certain. No warning lamps or messages are associated with the issue. The only symptom is the rattle in the engine compartment
There are many models of the gl550 ranging from 2012-2015, where the second row driver side seats get stuck in a downward position. Recently it happened to me and another gl550 was in the shop at Mercedes North Houston for repair for the same issue. These are very common in this make and model and something needs to be addressed concerning the matter.
As I was driving down the freeway the whole vehicle caught on fire and we got out of the car and within 2-3 minutes while car was burned to ashes.
As I was driving down the freeway the whole vehicle caught on fire and we got out of the car and within 2-3 minutes while car was burned to ashes.
As I was driving down the freeway the whole vehicle caught on fire and we got out of the car and within 2-3 minutes while car was burned to ashes.
MY CAR HAS AN ONGOING PROBLEM WITH THE HVAC SYSTEM. IT GENERATES A MOLD AND MILDEW SMELL WHILE USING THE AC AND HEAT. MERCEDES SAYS THEY NO OF THIS ISSUE BUT HAVE NO PERMANENT FIX. THE SMELL IS SO BAD THAT IT IS ALMOST UN-DRIVABLE. MERCEDES DEALERSHIPS HAVE BULLETINS THAT DENOTE THE ISSUE IS KNOWN, BUT THEIR WORK AROUND ONLY TEMPORARILY IMPROVES THE SMELL. THERE IS AN OBVIOUS ENGINEERING ISSUE WITH THE HVAC SYSTEM THAT IS UNHEALTHY. THERE IS APPARENTLY THAT FORMS AROUND THE MOLD AROUND THE AC EVAPORATOR. MERCEDES HAS AN INTERNAL ALERT # TSB LI83-30-P-059119. THIS IS NOT A PERMANENT FIX AND ONLY IMPROVED THE SMELL FOR 3-4 WEEKS AND TOOK OVER TWO DAYS TO IMPLEMENT. THE SMELL OCCURS ALL THE TIME WHEN EITHER THE AC OR HEATER IS ON. THIS STARTED AT 2200 MILES AND CONTINUES TODAY (I HAVE 17K MILES NOW).
Mileage: 2,200
Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.
Read our methodology — how this data is sourced, computed, and verified.