2018 Mercedes-Benz GLS 550
Problems, Recalls & Reliability Report
Quick Summary
The 2018 Mercedes-Benz GLS 550 has 7 owner complaints filed with NHTSA — that's 1.0x the segment average of 7. The most common issue is other problems (29% of all complaints), specifically: i was driving in a rural area when all of a sudden i heard what sounded like an explosion. my first instinct was that i had blown a tire because it was so loud. however, the car was handling fine and no warning messages came on. my husband and i both said "what was that?" everything on seemed fin. There is 1 recall issued for this model year.
7
Total Complaints
1
Recalls Issued
—/5
Safety Stars
1.0x
vs Segment Avg
Known Problems(top 5 of 6)
OTHER
2 complaints- • I WAS DRIVING IN A RURAL AREA WHEN ALL OF A SUDDEN I HEARD WHAT SOUNDED LIKE AN EXPLOSION. MY FIRST INSTINCT WAS THAT I HAD BLOWN A TIRE BECAUSE IT WAS SO LOUD. HOWEVER, THE CAR WAS HANDLING FINE AND NO WARNING MESSAGES CAME ON. MY HUSBAND AND I BOTH SAID "WHAT WAS THAT?" EVERYTHING ON SEEMED FIN
- • Water collects at the front row floor at driver and passenger sides
“I WAS DRIVING IN A RURAL AREA WHEN ALL OF A SUDDEN I HEARD WHAT SOUNDED LIKE AN EXPLOSION. MY FIRST INSTINCT WAS THAT I HAD BLOWN A TIRE BECAUSE IT WAS SO LOUD. HOWEVER, THE CAR WAS HANDLING FINE AND NO WARNING MESSAGES CAME ON. MY HUSBAND AND I BOTH SAID "WHAT WAS THAT?" EVERYTHING ON SEEMED FIN”
— NHTSA complaint filing
Recalls (1)
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2016 - 2021 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, GT-Class, C-Class, E-Class, S-Class, CLS-Class, SL-Class, B-Class, GLB-Class, GLC-Class, and G-Class vehicles. Please refer to the Part 573 report for specific vehicle model details. The software design of the communication module may fail to communicate the correct vehicle location for the emergency call system (eCall) in the event of a crash.
Risk: Failure of the eCall system may result in emergency responders being dispatched to the wrong location, increasing the risk of injury following a crash.
Fix: MBUSA will notify owners, and the communication module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. The recall began March 12, 2021. Owners may contact MBUSA customer service at 1-877-762-8267. MBUSA's number for this recall is 2021020025.
Estimated Insurance Cost for 2018 Mercedes-Benz GLS 550
How this estimate is calculated
Coverage assumed: 100/300/100 liability + comprehensive/collision, $500 deductibles. Data sources: NAIC 2024 + HLDI loss studies.
Maintenance & Warranty
Recommended Mercedes-Benz GLS 550 Service Intervals
Service A / Service B alternating schedule. Requires MB-approved oil (229.5 spec typically).
"Severe service" conditions (heavy towing, extreme temps, city stop-and-go) typically halve these intervals. Always consult your vehicle's owner's manual for the authoritative schedule.
Mercedes-Benz New-Vehicle Warranty Coverage
EQ EV battery warranty is 10 years/155,000 miles
These are the terms for a new Mercedes-Benz. If you're buying a used 2018 GLS 550, remaining coverage is usually pro-rated from the vehicle's original in-service date. Not all coverage transfers between owners — check with a Mercedes-Benz dealer for VIN-specific remaining warranty.
Estimated Repair Costs
Estimates based on average reported repair costs. Actual costs vary by location, shop, and severity.
🔍 Pre-Purchase Inspection Checklist
Based on 7 owner complaints for this specific year, here's what to check or ask about:
- ☐OTHER: I WAS DRIVING IN A RURAL AREA WHEN ALL OF A SUDDEN I HEARD WHAT SOUNDED LIKE AN EXPLOSION. MY FIRST INSTINCT WAS THAT I HAD BLOWN A TIRE BECAUSE IT WAS SO LOUD. HOWEVER, THE CAR WAS HANDLING FINE AND NO WARNING MESSAGES CAME ON. MY HUSBAND AND I BOTH SAID "WHAT WAS THAT?" EVERYTHING ON SEEMED FIN
Typically appears around 50K miles. Repair cost ~$500
- ☐TRANSMISSION: WHILE IN MOTION ON A HIGHWAY IN STOP AND GO TRAFFIC, CAR SHIFTED ITSELF FROM DRIVE TO NEUTRAL WITHOUT ANY DRIVER INPUT. ALL INDICATOR LIGHTS ON DASH TURNED ON. DRIVER UNABLE TO SHIFT FROM NEUTRAL BACK TO DRIVE TO REGAIN CONTROL OF VEHICLE. DRIVER COULD ONLY SHIFT TO PARK. DRIVER SHIFTED VEHICLE TO P
Typically appears around 50K miles. Repair cost ~$500
- ☐ELECTRICAL: SEATBELT HAD TIGHTENED AND NOT RELEASED WHEN MY BODY MOVES. BRAKES ARE NOT APPLIED. TYPICALLY DURING DRIVING I'M SMALL ENOUGH TO MANEUVER MY HAND DOWN TO RELEASE RED SEAT BELT BUTTON. *TR I'VE HAD TO STOP MY VEHICLE 5-10 TIMES TO RELEASE BELT. I HAVE 2 SMALL KIDS 7/ 11 BOTH ARE 60 POUNDS TH
Typically appears around 50K miles. Repair cost ~$500
- ☐SEATS/RESTRAINTS: SEATBELT HAD TIGHTENED AND NOT RELEASED WHEN MY BODY MOVES. BRAKES ARE NOT APPLIED. TYPICALLY DURING DRIVING I'M SMALL ENOUGH TO MANEUVER MY HAND DOWN TO RELEASE RED SEAT BELT BUTTON. *TR I'VE HAD TO STOP MY VEHICLE 5-10 TIMES TO RELEASE BELT. I HAVE 2 SMALL KIDS 7/ 11 BOTH ARE 60 POUNDS TH
Typically appears around 50K miles. Repair cost ~$500
- ☐RECALLS: Verify all 1 recall have been completed — free at any Mercedes-Benz dealer
- ☐General: Get a pre-purchase inspection from an independent mechanic ($100-$200)
Mercedes-Benz GLS 550 — Year Comparison
How does 2018 compare to other years? Fewer complaints = more reliable.
Full years-to-avoid analysis →NHTSA Safety Rating
No NHTSA safety rating available
At a Glance
- Complaints
- 7
- Recalls
- 1
- Fire reports
- 0
- Crash reports
- 0
- Injury reports
- 0
- Segment avg
- 7
Check a Specific VIN
See recalls for YOUR 2018 Mercedes-Benz GLS 550