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Mercedes-Benz · Known Issues

2012 Mercedes-Benz GL-Class Problems: 4 Known Issues

2012 model year · 4,200+ owner reports · Updated August 2026

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Issue summary

According to Au7o's analysis of 4,200+ owner reports, the 2012 Mercedes-Benz GL-Class has 4 documented known issues, with 2 rated critical. The most serious are AIRMATIC Air Suspension Compressor Failure ($1,200-$3,000 repair) and OM642 Diesel Oil Cooler Seal Leak ($1,000-$2,500 repair). The most commonly reported issue is AIRMATIC Air Suspension Compressor Failure with 1,800 owner reports. Across all issues with published estimates, repair costs range from $200 to $3,500. DIY maintenance guides at au7o.io.

In This Article

  • GL-Class Suspension1
  • GL-Class Engine1
  • GL-Class Drivetrain1
  • GL-Class Body/Panels1
  • FAQ
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In This Article

  • Suspension1
  • Engine1
  • Drivetrain1
  • Body/Panels1
  • FAQ

All 4 Known Issues

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ALL YEARS2016201520142013201220112010200920082007
Community reported
1,800 owners

On the 2007-2016 Mercedes-Benz GL-Class, the air suspension compressor on the GL-Class is heavily stressed due to the vehicle's size and weight. The compressor fails from overwork caused by slow leaks in the air springs, leading to a complete inability to maintain ride height. The GL's weight means the compressor cycles more frequently than on lighter Mercedes models, accelerating wear.

This issue also affects: Mercedes-Benz CLS-Class, Mercedes-Benz GLC, Mercedes-Benz GLE

Common Symptoms

  • Vehicle sitting low after overnight parking
  • AIRMATIC fault warning on dashboard
  • Compressor running constantly or not at all
  • Unable to select ride height modes
  • Rough ride quality

How to Fix

Replace the air suspension compressor. Inspect and replace any leaking air springs simultaneously to prevent premature failure of the new compressor. The compressor relay should also be replaced. Arnott offers a quality aftermarket compressor at significant savings over OEM.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Arnott P-3214 air-suspension compressor with dryer and relay
    OEMArnott P-3214

    2007-2012 GL-Class X164 compressor-failure branch after leak and electrical diagnosis Fitment/availability: The inspected direct product page identifies Arnott P-3214 for GL-Class X164/ML W164, with relay and dryer; it showed €347.43, in…

    Trodo
  • Arnott P-3258 air-suspension compressor with dryer and relay
    OEMArnott P-3258

    2013-2016 GL-Class X166 compressor-failure branch after leak and electrical diagnosis Fitment/availability: The inspected product/manufacturer evidence identifies P-3258 specifically for 2013-2019 GL/GLS X166 and 2012-2019 ML/GLE W166, i…

    eEuroparts

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$1,200 - $3,000

Research This Issue

Based on 1,800 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence1,800 owner reportsLast reported by owners Jan 2026Reviewed Mar 2026
Community reported
1,200 owners

On the 2007-2016 Mercedes-Benz GL-Class, the OM642 3.0L V6 diesel engine in the GL-Class develops oil cooler seal leaks where engine oil seeps into the coolant system or externally. The oil cooler is sandwiched between the engine block and intake manifold, and the gaskets harden over time. This causes oil contamination of the coolant, leading to overheating and potential head gasket damage.

This issue also affects: Mercedes-Benz E-Class, Mercedes-Benz GLK-Class, Mercedes-Benz M-Class

Common Symptoms

  • Oil in coolant reservoir (milky or brown appearance)
  • Engine oil level dropping
  • Coolant temperature running higher than normal
  • Oil leak from rear of engine near firewall
  • Sweet and oily smell from engine bay

How to Fix

Replace the oil cooler seals and gaskets. This requires intake manifold removal for access. Flush the cooling system thoroughly to remove all oil contamination. Replace the thermostat and coolant if oil has entered the cooling system. Some owners replace the entire oil cooler assembly for added reliability.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Elring 524.281 OM642 oil-cooler seal and disturbed-gasket kit
    OEMElring 524.281

    Complete cooler-seal access branch after the exact OM642 valley oil source is confirmed Fitment/availability: The inspected direct page identifies Elring 524.281 with two updated cooler seals and the intake/EGR/turbo/air-path seals distu…

    ECS Tuning

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Owner tips & cautions

  • WarningCheck your coolant reservoir at every oil change. If it looks milky or has a film of oil on top, the oil cooler seals are leaking. Do not drive with oil-contaminated coolant — it degrades the head gasket.
Typical repair cost:$1,000 - $2,500

Research This Issue

Based on 1,200 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence1,200 owner reportsLast reported by owners Dec 2025Reviewed Mar 2026
Community reported
680 owners

On the 2007-2016 Mercedes-Benz GL-Class, the 4MATIC transfer case on the GL-Class develops actuator failures and internal chain wear. The electronic actuator that controls torque distribution fails, triggering drivetrain faults. Additionally, the internal chain stretches over time, producing a whining noise and eventually causing the transfer case to fail completely.

This issue also affects: Mercedes-Benz CLS-Class, Mercedes-Benz M-Class, Mercedes-Benz GLA

Common Symptoms

  • 4MATIC fault warning on dashboard
  • Whining noise from center of vehicle
  • Vibration at highway speeds
  • Clunking when shifting from park to drive

How to Fix

For actuator failures, replace the external actuator motor — the transfer case does not need removal. For chain wear, the transfer case must be removed and rebuilt or replaced. Regular transfer case fluid changes (every 40,000 miles) help extend chain life.

Owner tips & cautions

  • TipChange the transfer case fluid every 40,000 miles with Mercedes-approved fluid. This is not in the standard maintenance schedule but significantly extends transfer case life on these heavy SUVs.
Typical repair cost:$600 - $3,500

Research This Issue

Based on 680 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence680 owner reportsLast reported by owners Nov 2025Reviewed Mar 2026
Community reported
520 owners

On the 2007-2016 Mercedes-Benz GL-Class, the power tailgate on the GL-Class develops failures in the gas struts and electric latch mechanism. The gas struts lose pressure and can no longer hold the heavy tailgate open, creating a safety hazard as the gate drops unexpectedly. The electric latch mechanism also wears, preventing the tailgate from opening or closing automatically.

Common Symptoms

  • Tailgate does not stay open
  • Tailgate drops slowly when released
  • Power tailgate does not open or close
  • Clicking noise from tailgate latch
  • Tailgate warning light on dashboard

How to Fix

Replace the tailgate gas struts (sold in pairs). If the electric latch is failing, replace the tailgate lock actuator. Lubricate the tailgate hinges and latch mechanism periodically. Aftermarket gas struts from Stabilus are available at lower cost than OEM.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Stabilus 019164 right-rear X164 tailgate gas spring
    OEMStabilus 019164 / Mercedes A1647400645

    2007-2012 GL-Class X164 right passive tailgate-support branch after isolated loss of gas-spring force Fitment/availability: The inspected direct product page identifies Stabilus 019164/LIFT-O-MAT as a right-rear 760-N, 521-mm gas spring …

    Trodo

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$200 - $800

Research This Issue

Based on 520 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence520 owner reportsLast reported by owners Oct 2025Reviewed Mar 2026
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Other Mercedes-Benz Models

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Frequently Asked Questions

What are the most common Mercedes-Benz GL-Class problems?

According to Au7o's analysis of 4,200+ owner reports, the 2012 Mercedes-Benz GL-Class has 4 documented issues. The most frequently reported are: AIRMATIC Air Suspension Compressor Failure, OM642 Diesel Oil Cooler Seal Leak, Transfer Case Actuator and Chain Wear (4MATIC). Of these, 2 are rated critical and should be addressed promptly.

Is the Mercedes-Benz GL-Class reliable?

The 2012 Mercedes-Benz GL-Class has 4 known issues documented across 4,200+ owner reports. 2 issues are rated critical: AIRMATIC Air Suspension Compressor Failure and OM642 Diesel Oil Cooler Seal Leak. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Mercedes-Benz GL-Class problems?

Repair costs for known Mercedes-Benz GL-Class issues range from $200 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, AIRMATIC Air Suspension Compressor Failure, typically costs $1,200-$3,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2007-2016 Mercedes-Benz GL-Class AIRMATIC Air Suspension Compressor Failure?

The air suspension compressor on the GL-Class is heavily stressed due to the vehicle's size and weight. The compressor fails from overwork caused by slow leaks in the air springs, leading to a complete inability to maintain ride height. The GL's weight means the compressor cycles… Repairs typically run $1,200-$3,000. Severity: high.

What is the 2007-2016 Mercedes-Benz GL-Class OM642 Diesel Oil Cooler Seal Leak?

The OM642 3.0L V6 diesel engine in the GL-Class develops oil cooler seal leaks where engine oil seeps into the coolant system or externally. The oil cooler is sandwiched between the engine block and intake manifold, and the gaskets harden over time. This causes oil contamination… Repairs typically run $1,000-$2,500. Severity: high.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 4,200+ owner reports, NHTSA recalls, TSBs, and automotive forums.

What is the 2007-2016 Mercedes-Benz GL-Class Transfer Case Actuator and Chain Wear (4MATIC)?

The 4MATIC transfer case on the GL-Class develops actuator failures and internal chain wear. The electronic actuator that controls torque distribution fails, triggering drivetrain faults. Additionally, the internal chain stretches over time, producing a whining noise and eventual… Repairs typically run $600-$3,500. Severity: medium.

What is the 2007-2016 Mercedes-Benz GL-Class Power Tailgate Strut and Latch Failure?

The power tailgate on the GL-Class develops failures in the gas struts and electric latch mechanism. The gas struts lose pressure and can no longer hold the heavy tailgate open, creating a safety hazard as the gate drops unexpectedly. The electric latch mechanism also wears, prev… Repairs typically run $200-$800. Severity: low.