Mercedes GLS Problems: What To Know Before Buying

May 11, 2025May 11, 2025 @CarExamer 13 Views 0 Comments

The Mercedes-Benz GLS is the flagship full-size SUV in the Mercedes lineup, known for combining luxury, space, and advanced technology. Whether it’s the GLS 450, GLS 580, AMG GLS 63, or the ultra-luxurious Maybach GLS 600, this SUV delivers on performance and presence. However, like any premium vehicle, the GLS has a few known issues that potential buyers should be aware of — especially in the X166 (2013–2019) and X167 (2020–present) generations. Let’s have a look on Mercedes GLS Problems:

Book inspection

1. AIRMATIC Suspension Faults

Many GLS models come with AIRMATIC or E-Active Body Control air suspension for enhanced comfort. While smooth on the road, this system can be prone to failures over time.

Common symptoms:

Vehicle sagging after being parked
Warning messages on the dashboard
Noisy air compressor or leaking struts
Uneven ride height or bouncing over bumps

Tip: Have the suspension system inspected, especially on higher-mileage or used models.

2. MBUX Infotainment System Glitches

The newer X167 generation features Mercedes’ advanced MBUX infotainment system. Though highly praised for its user interface, some owners report glitches.

Reported issues:

Frozen or lagging screens
Bluetooth or smartphone connectivity failures
Navigation inaccuracies
Voice command errors

Solution: Dealership software updates typically resolve these problems.

3. Transmission Hesitation

Equipped with a 9-speed 9G-TRONIC automatic gearbox, the GLS generally delivers smooth shifting. However, some users have reported hesitation or jerky shifts, especially in stop-and-go traffic.

Watch for:

Delayed gear engagement
Rough shifting when cold
Transmission fault lights

Regular servicing and transmission software updates help address most concerns.

4. Electrical System and Sensor Issues

With its high-tech features, the GLS relies heavily on sensors and control modules. These can sometimes trigger unexpected faults.

Common complaints:

Malfunctioning driver assistance systems (lane assist, blind spot monitoring)
Power tailgate problems
Unresponsive keyless entry
Random warning lights or battery drain

A full diagnostic scan can reveal any underlying issues before purchase.

5. Diesel DPF and AdBlue Problems

Diesel versions of the GLS (like the GLS 350d or 400d) may face problems with the Diesel Particulate Filter (DPF) or AdBlue emissions system if driven mostly on short trips.

Symptoms:

Warning lights for DPF or AdBlue
Reduced power or limp mode
Excessive fuel consumption

Prevention: Regular motorway driving helps maintain DPF and emission system health.

6. Interior Trim Wear and Cabin Noises

Although the GLS has a luxurious interior, some owners report interior rattles and trim wear, especially in early production models.

Typical issues:

Rattling from the dashboard or sunroof
Loose seat controls or trim panels
Squeaks from the center console or doors

These may not affect performance but can impact the overall ownership experience.

Final Thoughts: Is the Mercedes GLS Reliable?

Yes — the Mercedes GLS is a high-performing, luxury SUV that provides a premium experience when properly maintained. Most of its common issues are related to software, sensors, or wear-and-tear components — not major mechanical failures.

Before buying: