Most common 2014 Mercedes-Benz GL450 problems
Share of the 21 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Mercedes-Benz GL450 complaints by model year
Best GL450 years: 2017, 2009, 2016. Years to avoid: 2007, 2011, 2012, 2008, 2010. Compare all years →
2014 Mercedes-Benz GL450 recalls (3)
Communication
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2013-2017 vehicles due to a software fault that may cause the date and time for the emergency call system (eCall) to differ from the actual date and time, potentially relaying an inaccurate vehicle location.
Remedy: MBUSA has initiated an Over the Air (OTA) remote update. MBUSA will also notify owners, and dealers will check software for a successful OTA or update the communication module software as needed, free of charge.
Suspension › Front
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2012-2014 ML350 Bluetec 4Matic and ML550 4Matic, 2012-2015 ML63 AMG 4Matic and ML350 4Matic, 2013-2016 GL350 Bluetec 4Matic, GL550 4Matic and GL63 AMG 4Matic, 2017 GLS350d 4Matic, GLS450 4Matic, GLS550 4Matic and GLS63 AMG 4Matic, 2015 ML400 4Matic, 2016 GLE400 4Matic, GLE350…
Remedy: MBUSA will notify owners, and dealers will correct the oil level as necessary and replace the reservoir sealing cap to prevent oil foam from leaking out, free of charge. The recall began August 30, 2018.
Child seat › Latch strap
Mercedes Benz USA, LLC (Mercedes) is recalling certain model year 2014 GL350 BlueTEC 4Matic, GL450 4Matic, GL550 4Matic, and GL63 AMG vehicles manufactured November 4, 2013, through November 15, 2013.
Remedy: Mercedes will notify owners, and dealers will inspect and, if necessary, replace the seat pan of the second row seat, free of charge. The recall began on May 2, 2014. Owners may contact Mercedes at 1-800-367-6372.
What 2014 Mercedes-Benz GL450 owners say
Engine & cooling
The contact owns a 2014 Mercedes-Benz GL450. The contact stated that while driving 65 MPH, the vehicle stalled. The check engine warning light was illuminated. The vehicle was able to be driven to the residence. The vehicle was towed to the dealer, where it was diagnosed and determined that the engine needed to be replaced. The vehicle was then towed to an independent mechanic, who also determined that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and a case was opened. The failure mileage was approximately 108,000.
Oil leaking and wicking into camshaft position sensors, camshaft magnets, O2 sensors, engine wiring harness and ultimately, the ECU is destroying all electronic components connected to the engine causing misfiring and seizing. The issue is quite prevalent via internet research as potentially thousands of owners all experience the same issue. Our local Mercedes Benz dealer indicated this issue "just popped up" immediately outside the warranty period (1 yr) for our used purchase, and would require a replacement of the camshaft, sensors, magnets, and wiring harness to the tune of $14,000. This is a design flaw of the engine that placed these components in locations predisposed to contact with engine oil. The root cause of the oil leak is unknown and even Mercedes Benz can not tell why the oil is leaking on these components. …
Windows, wipers & sunroof
After picking up children from school, I was driving out of the parking lot down a slow-speed arterial road (35 mph posted speed limit). Roughly 30 seconds after reaching the posted speed limit we heard a loud bang (like a gunshot) and immediately pulled over. The middle section of the panoramic sunroof had shattered. Upon examination on the side of the road there was no apparent impact spot or item in the roadway that would have indicated that particular section of the roof had been struck by anything (no rock, branch, brick, etc), nor were there any other vehicles in the vicinity that might have kicked up an object to hit the roof and nothing else. The sunroof appears to have spontaneously shattered without warning. The temperature outside was moderate (roughly 60 degrees) and the car had been driven earlier in the day without incident. …
Tl* the contact owns a 2014 Mercedes-Benz GL450. While operating the vehicle, several messages displayed regarding the parking brake release, transmission, and the vehicle being inoperable. Also, several electrical features malfunctioned. The vehicle was towed to world wide motors inc. (3900 east 96th st, indianapolis, in) where it was diagnosed that the main vehicle wire harness was damaged due to water that drained from the sun roof into the panels of the vehicle. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 57,000.
Electrical system
Oil leaking and wicking into camshaft position sensors, camshaft magnets, O2 sensors, engine wiring harness and ultimately, the ECU is destroying all electronic components connected to the engine causing misfiring and seizing. The issue is quite prevalent via internet research as potentially thousands of owners all experience the same issue. Our local Mercedes Benz dealer indicated this issue "just popped up" immediately outside the warranty period (1 yr) for our used purchase, and would require a replacement of the camshaft, sensors, magnets, and wiring harness to the tune of $14,000. This is a design flaw of the engine that placed these components in locations predisposed to contact with engine oil. The root cause of the oil leak is unknown and even Mercedes Benz can not tell why the oil is leaking on these components. …
Tl* the contact owns a 2014 Mercedes-Benz GL450. While operating the vehicle, several messages displayed regarding the parking brake release, transmission, and the vehicle being inoperable. Also, several electrical features malfunctioned. The vehicle was towed to world wide motors inc. (3900 east 96th st, indianapolis, in) where it was diagnosed that the main vehicle wire harness was damaged due to water that drained from the sun roof into the panels of the vehicle. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 57,000.
Frequently asked questions
Is the 2014 Mercedes-Benz GL450 a good car?
Based on 21 owner complaints filed with NHTSA, the 2014 GL450 rates better than average: 43% fewer complaints than a typical year of the GL450 at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2014 Mercedes-Benz GL450?
The engine & cooling — 7 complaints, 33% of all complaints for this model year. Next are the windows, wipers & sunroof (3) and electrical system (3).
How many recalls does the 2014 Mercedes-Benz GL450 have?
There are 3 recalls for the 2014 Mercedes-Benz GL450, the most recent from November 1, 2019 (communication). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Mercedes-Benz GL450?
The best years by complaints, compared at the same age, are 2017, 2009 and 2016. Years to avoid or approach with caution: 2007, 2011, 2012, 2008 and 2010. See the full Mercedes-Benz GL450 years comparison.
At what mileage do 2014 Mercedes-Benz GL450 problems happen?
The median mileage reported in complaints is about 57,000 miles; 40% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.