2018 Mercedes-Benz GLS 450
Problems, Recalls & Reliability Report
Quick Summary
The 2018 Mercedes-Benz GLS 450 has 20 owner complaints filed with NHTSA — that's 0.9x the segment average of 23. The most common issue is suspension problems (15% of all complaints), specifically: i took the car to the service 3 times in 4 months. there are many problems with the car. the first problem was that the left rear shock was leaking which made a squeaking noise when driving. there was also an odor problem with the car that was coming from the ventilations. these two problems were fi. There are 2 recalls issued for this model year. ⚠️ 4 fire reports filed.
20
Total Complaints
2
Recalls Issued
—/5
Safety Stars
0.9x
vs Segment Avg
Known Problems(top 5 of 8)
SUSPENSION
3 complaints- • I TOOK THE CAR TO THE SERVICE 3 TIMES IN 4 MONTHS. THERE ARE MANY PROBLEMS WITH THE CAR. THE FIRST PROBLEM WAS THAT THE LEFT REAR SHOCK WAS LEAKING WHICH MADE A SQUEAKING NOISE WHEN DRIVING. THERE WAS ALSO AN ODOR PROBLEM WITH THE CAR THAT WAS COMING FROM THE VENTILATIONS. THESE TWO PROBLEMS WERE FI
- • This 2018 gls 450 has issues with suspension system. Bought this car in 2023 and using since Jna 2023 and suspension system failed like 3 -4 times. Mechanic changed the air compressor , valves and others and still the car has same issue. It used to lift the car to adequate height but the compressor
- • When attempting to rise/lower the automatic suspension, the compressor cooling notification pops up, followed by a malfunction. After this occurs, the vehicle is incredibly bumpy, to the point of it being unsafe to drive. The vehicle has been repaired twice already by the dealership under extended w
“I TOOK THE CAR TO THE SERVICE 3 TIMES IN 4 MONTHS. THERE ARE MANY PROBLEMS WITH THE CAR. THE FIRST PROBLEM WAS THAT THE LEFT REAR SHOCK WAS LEAKING WHICH MADE A SQUEAKING NOISE WHEN DRIVING. THERE WAS ALSO AN ODOR PROBLEM WITH THE CAR THAT WAS COMING FROM THE VENTILATIONS. THESE TWO PROBLEMS WERE FI”
— NHTSA complaint filing
Recalls (2)
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 450
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 450 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 450, 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 20 owner complaints for this specific year, here's what to check or ask about:
- ☐SUSPENSION: I TOOK THE CAR TO THE SERVICE 3 TIMES IN 4 MONTHS. THERE ARE MANY PROBLEMS WITH THE CAR. THE FIRST PROBLEM WAS THAT THE LEFT REAR SHOCK WAS LEAKING WHICH MADE A SQUEAKING NOISE WHEN DRIVING. THERE WAS ALSO AN ODOR PROBLEM WITH THE CAR THAT WAS COMING FROM THE VENTILATIONS. THESE TWO PROBLEMS WERE FI
Typically appears around 50K miles. Repair cost ~$500
- ☐BRAKES: I WAS ALREADY 90% IN PARKING LINE WHICH IS HANDICAP'S. ABOUT TO STOP RIGHT FRONT OF HANDICAP SIGN, SUDDENLY VEHICLE START MOVING FORWARD WHILE MY FOOT WAS IN BRAKE SO I PUSH LITTLE HARD TO COMPLETE STOP BUT VEHICLE SUDDENLY ACCELERATE FORWARD SMASHING INTO THE BUILDING GLASS ENTRY WALL AND DOOR. I A
Typically appears around 50K miles. Repair cost ~$500
- ☐ELECTRICAL: TL* THE CONTACT OWNS A 2018 MERCEDES-BENZ GLS450. WHILE DRIVING 70 MPH, THE VEHICLE LOST POWER AND ALL THE WARNING INDICATORS ON THE INSTRUMENT PANEL ILLUMINATED. ALSO, WHEN THE BRAKE PEDAL WAS DEPRESSED, THE VEHICLE FAILED TO STOP. THE CONTACT STATED THAT THE VEHICLE FINALLY STOPPED UPON REACHING A
Typically appears around 50K miles. Repair cost ~$500
- ☐BODY/STRUCTURE: PART OF MY PANORAMIC SUNROOF SPONTANEOUSLY SHATTERED WHILE SITTING AT A STOPLIGHT. THERE WERE NO CARS OR TREES AROUND AT THE TIME. NOTHING TOUCHED THE CAR WHEN IT HAPPENED.
Typically appears around 50K miles. Repair cost ~$500
- ☐RECALLS: Verify all 2 recalls have been completed — free at any Mercedes-Benz dealer
- ☐General: Get a pre-purchase inspection from an independent mechanic ($100-$200)
Mercedes-Benz GLS 450 — Year Comparison
How does 2018 compare to other years? Fewer complaints = more reliable.
NHTSA Safety Rating
No NHTSA safety rating available
At a Glance
- Complaints
- 20
- Recalls
- 2
- Fire reports
- 4
- Crash reports
- 1
- Injury reports
- 0
- Segment avg
- 23
Check a Specific VIN
See recalls for YOUR 2018 Mercedes-Benz GLS 450