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Mercedes-Benz GL450Model year report

2015 Mercedes-Benz GL450 Problems

Complaints
18filed with NHTSA
Median mileage
38,508miles, 10 complaints with mileage
Recalls
3campaigns on record
Trend
FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
NHTSA crash rating
—no overall rating published
EPA fuel economy
19 mpgcombined, 3.0L 6-cyl 4WD · 17 city / 21 hwy

Sources: NHTSA records for the 2015 Mercedes-Benz GL450 (complaints, recalls, investigations), EPA fuel economy. Report an error

NHTSA recorded 18 consumer complaints for the 2015 Mercedes-Benz GL450. The part named most often is engine, with 7 complaints (39% of the total), followed by other or unknown (3) and seats (3). 10 of the complaints include a mileage, and 50% of those were filed for vehicles with under 50,000 miles; the median is 38,508 miles. Of all complaints, 1 involved a crash, 2 a fire, 1 an injury, according to the filers. NHTSA lists 3 recall campaigns and 85 technical service bulletins for this model year. Engine complaints overlap with 5 technical service bulletins filed under the same part.

This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Example complaints

Engine: “Plastic coolant union on radiator hose going from the coolant expansion tank to the electric auxiliary coolant pump catastrophically failed when I was changing the lh driver side front headlight bulb. I was leaning over the front of the vehicle with my head down to view the back side of the headlamp to remove the bulb, the plastic coolant union broke at this exact time shooting hot engine coolant all over my face. I've suffered 2nd and 3rd degree burns to my face, lips, neck and chest as a result. The vehicle engine was on, at idle speed, vehicle stationary in driveway.”

NHTSA complaint #11390996, filed 2021-02, 86,230 miles

Other or unknown: “My 2015 Mercedes-Benz GLE 450 experienced an unexpected vehicle fire on Feb 13th 2026. The vehicle was just parked when I noticed smoke from the engine. The vehicle caught fire within a short period of time, and 911 was called. There was no known external cause for the fire. The incident appeared to originate from the engine compartment. This created a serious safety hazard and posed a risk of injury and property damage. The fire required immediate response from the fire department, and the vehicle was declared a total loss. The vehicle is currently in the possession of the insurance company. …”

NHTSA complaint #11728375, filed 2026-03

Seats: “Tried to install child safety seats in 2nd row seats. The 2nd row headrests prevent the proper installation of the child safety seats. The headrests cannot be removed, or moved out of the way so that the child safety seats can be installed properly. I have reported to our Mercedes-Benz dealer. They are working on a response.”

NHTSA complaint #10669746, filed 2015-01, 2,000 miles

Suspension: “On 12/30/2017 we purchased a Mercedes-Benz certified pre-owned 'cpo' vehicle from mercedes benz of north palm beach. We arrived at the dealership in the afternoon sent by mercedes benz of west palm beach their affiliated dealership for the specific vehicle we purchased. When we arrived at the dealership to view the vehicle, it was not detailed from the previous owner. On the test drive with our sales person I noted unusual noises and ride conditions in the vehicle. …”

NHTSA complaint #11297931, filed 2020-01

Mileage when problems were reported

50% of the 10 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 5,000 and 86,230 miles.

40%0–100%10–2510%25–5020%50–7510%75–10020%100–1500%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (10 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 38,508 miles.

Complaints by year filed

Trend: falling. Complaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.

20143201820202022320242026
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Fuel economy and running cost

EPA ratings for each 2015 Mercedes-Benz GL450 version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).

VersionEngineTransmissionCityHwyComb.Fuel / yr
GL450 4matic 4WD3.0L 6-cyl7-speed automatic172119$4,350

Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.

Recalls and investigations

Recall details for the 2015 Mercedes-Benz GL450 → · Check a VIN at nhtsa.gov/recalls

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 85 on record; the latest 10 are shown.

See all 85 bulletins →

Other model years of the Mercedes-Benz GL450

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
2016135,0005—19—Not enough data
20151838,5083—19—Falling
20142156,0003—16—Rising
20133724,0003—1650 · TypicalStable
20124757,5003—150 · FewerFalling
20115573,0003—1550 · TypicalRising
20104292,1383—140 · FewerStable
200915121,0003—15—Falling
20085569,0002—1552 · TypicalStable
200711580,0002—15Not compared (before 2008)Falling

All Mercedes-Benz GL450 model years · Best and worst years by complaints

Frequently asked questions

How many NHTSA complaints does the 2015 Mercedes-Benz GL450 have?

NHTSA recorded 18 consumer complaints for the 2015 Mercedes-Benz GL450 as of Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2015 Mercedes-Benz GL450 is reported most often?

Engine is named most often, in 7 complaints (39% of the total), followed by other or unknown with 3.

Has the 2015 Mercedes-Benz GL450 been recalled?

NHTSA lists 3 recall campaigns for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

What gas mileage does the 2015 Mercedes-Benz GL450 get?

The EPA rates the 2015 Mercedes-Benz GL450 (GL450 4matic, 3.0L 6-cyl) at 19 mpg combined, 17 city and 21 highway, with an estimated annual fuel cost of $4,350 at 15,000 miles a year. Other engine and drive versions are rated differently.

At what mileage are problems with the 2015 Mercedes-Benz GL450 reported?

Among the 10 complaints that include a mileage, the median is 38,508 miles and the middle half falls between 5,000 and 86,230 miles; 50% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Fuel economy is from the EPA and DOE (fueleconomy.gov).

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.