2017 Mercedes-Benz GLS 450 Fuel system Problems
- Complaints
- 6about this part
- Share
- 17%of 35 total for the year
- Median mileage
- —not reported
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 6 complaints about the fuel system of the 2017 Mercedes-Benz GLS 450, 17% of the 35 complaints for this model year. 4 a fire, according to the filers.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“On 8/20/2026 I had a vacuum leak from the intake manifold and crankcase hoses repaired at a Vic's Bimmer Shop in the city of Lancaster California. This included the replacement of the oil separator breather on the engine. I drove my Mercedes Benz 2017 GLS450 less than 100 miles and the engine lost power and suddenly turned off. I was able to pull off onto the side of the freeway and then I saw smoke coming from under the hood and my wife and I exited the vehicle, called the fire department and the car burned completed on the side of the freeway and is a total loss. …”
NHTSA complaint #11760731, filed 2026-08“Our car, Mercedes GLS 450, caught on fire after pulled into the garage from a short drive on local streets, which resulted a total loss on our house. After pulling into the garage, the home link didn't work when tried to use it to close the garage door. Upon coming out of the car, smoke came out from under the hood and soon after it became flame. We attempted to extinguish the fire with a fire extinguisher as it appeared with hood still closed and fire immediately came back. By the time the firefighters came, there was a full fledged fire. …”
NHTSA complaint #11452172, filed 2022-02“Car destroyed by fire on March 19, 2023 while at a quick stop near Chickasaw, OK. Car was last serviced by Mercedes-Benz of Oklahoma City in December 2022. No personal injuries just a total loss of the vehicle. Cause of the fire at present is unknown. Pictures are available.”
NHTSA complaint #11513006, filed 2023-03“2017 mercedes benz GLS450. Consumer writes in regards to malfunctioning brakes. The consumer stated the vehicle experienced premature wear of the brakes. The vehicle leaked fuel. The interior door trim was not secure.”
NHTSA complaint #11196350, filed 2019-04“Vehicle check engine light came on early August 2024. Vehicle was brought in for service and checked for codes. B1F4500 Battery has excessive resistance B21059A The operating conditions of component have not been satisfied. Battery was replaced and rechecked. Po4427A Evap leak detected P04F000 Charcoal canister has a malfunction Smoke tested EVAP system to see if there was any leaks and tested the valves to make sure EVAP system was working correctly. Charcoal canister not actuating correctly so was replaced and checked. Gas cap also replaced Several days later Check engine light returns. …”
NHTSA complaint #11646348, filed 2025-03Related service bulletins
- 10181203Sep 25, 2020Replace tank filler recess and information labels
- 10167487Mar 21, 2014Minor leaks at the oil duct of the left or right cylinder head of engines 157, 276 and 278. 1. Left cylinder head: Oil passage plug hole on left beside mechanical vacuum pump. 2…
Fuel system: other model years
Other parts of the 2017 Mercedes-Benz GLS 450
8 complaintsEngine
8 complaintsOther or unknown
7 complaintsExterior lighting
6 complaintsSteering
4 complaintsSeats
2 complaintsBody and structure
2 complaintsSuspension
2 complaintsTransmission and drivetrain
2 complaintsBrakes
1 complaintsForward collision avoidance
1 complaintsSeat belts
1 complaints
← All problems reported for the 2017 Mercedes-Benz GLS 450
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.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology