Most common 2012 Mercedes-Benz GL450 problems
Share of the 47 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 →
2012 Mercedes-Benz GL450 recalls (3)
Service brakes, hydraulic › Power assist › Vacuum
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2006-2012 ML, GL, and R-Class vehicles. Please refer to MBUSA's recall report for specific vehicle model details. Moisture may accumulate and cause corrosion in the brake booster housing unit, which can result in reduced brake performance or brake failure.
Remedy: Owners are advised not to drive their vehicles until the remedy has been performed. Dealers will remove the rubber sleeve, inspect the brake booster, and as necessary, replace the brake booster.
Service brakes, hydraulic › Power assist › Vacuum
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2006-2012 ML-Class, GL-Class, and R-Class vehicles. Please refer to MBUSA's recall report for specific vehicle model details. Moisture may accumulate and cause corrosion in the brake booster housing unit, which can result in reduced brake performance or brake failure.
Remedy: Owners are advised not to drive their vehicles until the remedy has been performed. Dealers will remove the rubber sleeve, inspect the brake booster, and as necessary, replace the brake booster.
Air bags › Frontal › Driver side › Inflator module
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain model year 2009-2010 ML320 BlueTec 4Matic, GL320 BlueTec 4Matic and R320 CDI 4Matic, 2011 E350 Cabriolet and E550 Cabriolet, 2009-2011 ML350, ML350 4Matic, ML550 4Matic, ML63 AMG, and C63 AMG, 2010-2011 ML450 4Matic Hybrid, E350 Coupe, E350 4Matic, E550 Coupe, E550 4Matic,…
Remedy: MBUSA will their notify owners, and Fiat Chrysler will notify the affected Chrysler owners. Dealers for the respective brands will replace the driver's frontal air bag module, free of charge.
NHTSA defect investigations
Federal safety investigators have looked into a possible defect involving the 2012 Mercedes-Benz GL450:
Desiccated Air Bag Inflator Rupture
From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited.
What 2012 Mercedes-Benz GL450 owners say
Air bags all 22 →
I was driving on the highway my break warning light came and when I tried pulling over car would not stop my break pedal went all the way to floor causing me to hit the back of another car and I had to get a tow
I received 2 letter from Mercedes Benz USA regarding the air bag recall. The 1st letter gave me a date in March for replacement. The 2nd letter stated my airbag would be replaced in July 2018. When I called the dealership they stated the replacements have yet to be received and to call Mercedes corporate
Brakes
The contact owns a 2012 Mercedes-Benz GL450. The contact stated that while merging onto a highway, the vehicle failed to upshift at 32 MPH, without warning. The contact pulled over and restarted the vehicle and was then able to resume normal driving. The contact stated that the failure recurred several times. Neither the dealer nor the manufacturer was notified of the failure. The contact received notification of NHTSA Campaign Number: 22V315000 (Service Brakes, Hydraulics) however, the part to do the recall repair was unavailable. The manufacturer was not notified of the failure. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The vehicle was not repaired. The failure mileage was approximately 140,000.
The contact owns a 2012 Mercedes-Benz GL 450. The contact stated while driving approximately 45 MPH, the brake pedal was depressed but failed to stop the vehicle causing him to crash into the vehicle in front. There were no warning lights illuminated. Both air bags under the steering wheels deployed. The vehicle was towed to the residence. The police arrived on the scene and filed a report. The front of the vehicle hood, bumper, and radiator was destroyed. There were no injuries or medical treatments. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The contact related the failure to NHTSA Campaign Number 22V315000 (Service Brakes, Hydraulic). The approximate failure mileage was unknown.
Suspension
Car just reached 90K miles with limited driving. The airmatic suspension has been acting oddly for the past month - I would find it low in the rear in the morning after being parked in a flat garage. The next day the entire car would be lowered. Whe is turn off the car, you would hear air being released. Today, when parked, there was a loud explosion, the car shook for a few minutes and then the entire thing sank to the wheel wells. Assume the compressor has exploded and after reading various posts, this is a common problem with all Mercedes that have airmatic suspensions and should be fixed/recalled by Mercedes.
The rear suspension became soft after the dealer did an intial check after I complained about the vehicle feeling unstable after speeds of 70mph. I had both air shocks changed in the rear. After two (2) months the front suspension on the passenger also started to leak causing the vehicle to suspension to automatically adjust in the front while driving or parked. This occured whether the vehicle was parked or in motion, highway or city streets.
Frequently asked questions
Is the 2012 Mercedes-Benz GL450 a good car?
Based on 47 owner complaints filed with NHTSA, the 2012 GL450 rates use caution: 1.7× as many complaints as a typical year of the GL450 at the same age. It is one of the GL450 years we suggest avoiding. 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 2012 Mercedes-Benz GL450?
The air bags — 22 complaints, 47% of all complaints for this model year. Next are the brakes (8) and suspension (7).
How many recalls does the 2012 Mercedes-Benz GL450 have?
There are 3 recalls for the 2012 Mercedes-Benz GL450, the most recent from April 26, 2024 (vacuum). 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 2012 Mercedes-Benz GL450 problems happen?
The median mileage reported in complaints is about 60,000 miles; 39% 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.