Mercedes-Benz Gl-Class Years to AvoidThe weakest years — and the one you should buy instead
After reviewing every Mercedes-Benz Gl-Class we've analyzed (9 years), these are the 8 weakest. Each one has either an absolute low reliability score, chronic repair issues, or unusually high ownership costs relative to other Gl-Class years.
Proceed with caution
2008 Mercedes-Benz Gl-Class
While offering impressive luxury and seating for seven, the 2008 Mercedes-Benz GL-Class is notoriously problematic and carries a very high risk of expensive failures. What seems like a bargain on the used market can quickly become a financial black hole due to pervasive issues across its complex systems, most notably the air suspension and certain engine components.
Why this year scores low
Air springs (bags), compressor, and valve block frequently fail, leading to vehicle sagging, rough ride, or complete loss of suspension. This system is complex and critical to the vehicle's operation.
For M273 V8s (GL450/GL550), the balance shaft sprocket wears prematurely, requiring engine removal and a repair costing $4,000-$10,000+. OM642 diesels (GL320 CDI) are prone to oil cooler leaks (in the 'valley' of the engine) and intake manifold swirl flap motor failures.
The 7G-Tronic (722.9) transmission's conductor plate (containing speed sensors) and valve body commonly fail, causing harsh shifting, limp-mode, or no engagement of gears. Fluid leaks from the adapter bushing are also common.
Proceed with caution
2007 Mercedes-Benz Gl-Class
The 2007 Mercedes-Benz GL-Class offers unparalleled luxury and capability for its price, but it comes with a steep hidden cost. This is a formidable family hauler that demands consistent, expensive maintenance and carries a high risk of major system failures if not meticulously cared for. Proceed with extreme caution and a substantial repair budget.
Why this year scores low
The sophisticated air suspension system, while providing a sublime ride, is prone to leaks in the air springs, compressor failure, or valve block issues. Components degrade over time, leading to a sagging vehicle or compressor overwork.
The M273 V8 engine (GL450/GL550) is susceptible to balance shaft sprocket wear (if early production), leading to check engine lights and eventually engine timing issues. The M642 diesel (GL320 CDI) is notorious for oil cooler leaks, a labor-intensive repair under the 'hot V' turbocharger.
The electronic conductor plate inside the 7G-Tronic automatic transmission is a common failure point. This can cause erratic shifting, transmission 'limp mode,' or complete loss of gears, requiring replacement of the conductor plate and sometimes the valve body.
Proceed with caution
2009 Mercedes-Benz Gl-Class
The 2009 Mercedes-Benz GL-Class offers substantial luxury and space, making it an attractive used family hauler. However, it's a vehicle that demands a significant commitment to maintenance and a robust repair fund, as its complex systems are prone to expensive failures, especially with the air suspension and diesel engine. Proceed with caution, as deferred maintenance can quickly lead to financially crippling repairs.
Why this year scores low
The air springs (air bags) often develop leaks, leading to sagging and eventual failure. The compressor and valve block are also common failure points. This results in a rough ride, warning lights, and expensive repair bills.
The oil cooler seals on the OM642 diesel engine are notorious for leaking, often requiring intake manifold removal for access. Additionally, the plastic swirl flap motor linkage within the intake manifold commonly fails, impacting performance and triggering check engine lights.
The plastic linkage within the intake manifold for the tumble flaps is prone to breaking, causing a check engine light and reduced power. Additionally, cam position sensor magnets can leak oil, potentially wicking into the engine harness.
Proceed with caution
2010 Mercedes-Benz Gl-Class
The 2010 Mercedes-Benz GL-Class offers substantial luxury and family capability, but this sophisticated SUV demands a significant ongoing investment. While comfortable and powerful, potential buyers must be prepared for recurring, expensive repairs, especially concerning its complex air suspension and engine-specific vulnerabilities, making diligent pre-purchase inspection absolutely crucial for avoiding financial pitfalls.
Why this year scores low
The complex air suspension system, including the compressor, air springs (shocks), and valve block, is a widespread failure point. Components wear out, leading to sagging, uneven ride height, or complete system failure.
The OM642 3.0L V6 diesel engine is notorious for oil cooler leaks, often requiring extensive labor to replace. Turbocharger actuator or turbo failures are also common, leading to power loss and check engine lights.
The 7G-Tronic (722.9) automatic transmission can experience issues with its valve body and integrated conductor plate, leading to harsh shifts, delayed engagement, or transmission limp mode.
Proceed with caution
2011 Mercedes-Benz Gl-Class
The 2011 Mercedes-Benz GL-Class is a formidable and luxurious full-size SUV that can be a fantastic value on the used market, but it demands an owner with a significant budget for its predictable and expensive maintenance requirements. While structurally sound and comfortable, owners must be prepared to address known issues with its complex air suspension and engine components, particularly the diesel variant's emissions system. This vehicle is a financially risky proposition for those not prepared for specialist repair costs.
Why this year scores low
The air springs (shocks), compressor, valve block, and associated sensors are notorious for failure. Leaks in the air springs lead to sagging, while compressor failure prevents proper inflation. Replacements are expensive.
The BlueTEC diesel engine is plagued by issues with its AdBlue (DEF) system (heater element, NOX sensors), Diesel Particulate Filter (DPF) clogs, and oil cooler leaks. Oil cooler leaks require extensive labor to repair, often involving turbo removal.
The conductor plate within the valve body is a common failure point, leading to harsh shifts, limp mode, or complete transmission failure. Torque converter issues and fluid leaks are also prevalent.
Proceed with caution
2013 Mercedes-Benz Gl-Class
The 2013 Mercedes-Benz GL-Class can be a compelling luxury SUV for those seeking comfort and capability, but it demands a robust budget for maintenance and potential repairs. Proceeding with caution is paramount, as neglecting known weak points like the air suspension and complex diesel emissions systems can quickly lead to substantial financial strain. This vehicle is a status symbol with a high cost of upkeep.
Why this year scores low
The multi-chamber air springs, struts, and compressor are notoriously prone to failure, often leading to uneven ride height or complete collapse. Leaks in air lines or issues with ride height sensors are also common.
The AdBlue (DEF) system, NOx sensors, and SCR catalytic converter are high-failure items. Common issues include heater element failure in the AdBlue tank, clogged injectors, and sensor malfunctions, often triggering 'check engine' lights and limp mode.
The OM642 diesel engine is known for oil cooler seal leaks, often manifesting as oil in the valley of the engine. The M278 gasoline engines can develop leaks from vacuum pumps, valve covers, or timing chain covers, requiring extensive labor to address.
Proceed with caution
2014 Mercedes-Benz Gl-Class
The 2014 Mercedes-Benz GL-Class offers impressive luxury and capability, but it's a vehicle that demands rigorous maintenance and a significant repair budget. While fundamentally well-built, its complex systems, particularly the air suspension and diesel emissions equipment, represent substantial potential financial liabilities for the unwary buyer. This is a choice for those who appreciate German engineering and are prepared for the associated premium ownership costs.
Why this year scores low
The air springs (airbags) are prone to developing leaks over time, leading to a sagging vehicle, especially after sitting. The air compressor and valve block are also common failure points. This affects ride quality and vehicle height.
Components such as the AdBlue (DEF) heater, NOx sensors, and DPF (Diesel Particulate Filter) are highly susceptible to failure. These issues often trigger check engine lights, limp mode, and expensive repairs, essential for emissions compliance.
Various electrical gremlins can manifest, including infotainment (COMAND) system malfunctions, intermittent sensor failures (e.g., mass airflow, wheel speed), and parasitic battery drains. These can be difficult and costly to diagnose.
Proceed with caution
2015 Mercedes-Benz Gl-Class
The 2015 Mercedes-Benz GL-Class represents a pinnacle of luxury and capability, but it's a vehicle that demands a substantial commitment to proactive maintenance and has several known high-cost failure points. While offering immense comfort and a commanding presence, buyers must proceed with caution and a healthy repair budget to truly enjoy this full-size SUV.
Why this year scores low
The multi-chamber air suspension, while providing an excellent ride, is prone to leaks in the air struts/springs, compressor failure, or valve block malfunctions. This leads to sagging, ride height warnings, and a harsh ride.
On GL350 BlueTEC models, the AdBlue (DEF) injection system, Nox sensors, DPF (Diesel Particulate Filter), and EGR (Exhaust Gas Recirculation) valve are common failure points, often leading to limp mode and costly repairs.
As a highly computerized vehicle, the GL-Class can suffer from various electrical gremlins, including battery drain, intermittent sensor failures (ABS, ESP, parking sensors), infotainment system glitches, and power accessory malfunctions.