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Mercedes-Benz2005–2025 Major issues documented

Mercedes-Benz GLE W166: common faults & what to check

The W166 is the Mercedes-Benz GLE built 2012–2019. It was sold here with the 3.0 V6 diesel and 3.0 V6 petrol. Of the 7 faults documented for the GLE, 3 apply to this generation, each with its symptoms, what to inspect and a typical repair cost. Free, no account needed.

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  • Money owing
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7

Documented faults

Major

Most serious

$1,200–$4,000

Typical repair

5

Systems covered

You're looking at the W166

2 engine variants are documented for this generation. Pick yours to narrow further, or keep reading for the generation as a whole.

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A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

A 2013 Mercedes-Benz GLE is the W166 generation (2012 to 2019).

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Mercedes-Benz GLE W166Engine not picked yet

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Mercedes-Benz GLE · 2013

Narrowed to the year. No engine is recorded for this vehicle. Pick an engine to see which faults apply.

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matched on year only

What to look out for

The checks worth doing on a Mercedes-Benz GLE before you hand over any money. Every documented fault is listed below, each with its own page.

  • Costly issue

    Ideally view the car after it has stood overnight - it should sit level.

    See why

    Airmatic air suspension leaks and compressor failure (W164/W166)

    ML/GLE models with the optional Airmatic air suspension develop leaking air struts and eventually a failed compressor. A corner that sags after standing overnight, a slow rise on start-up, or an 'Airmatic - Visit Workshop' message are the signs. Struts and the compressor are expensive on a big SUV, so a neglected Airmatic car can cost thousands to put right; steel-sprung cars avoid this.

    What you would notice

    • A corner sagging after standing overnight
    • Slow to rise / uneven ride height on start-up
    • 'Airmatic - Visit Workshop' message
    • Compressor running constantly or failing to run

    Typically $1,200–$4,000 to put right.

See all 3 issues for this oneDocumented for the exact year and engine you picked.
Body, brakes, suspension & interior1

01Airmatic air suspension leaks and compressor failure (W164/W166)

Ideally view the car after it has stood overnight - it should sit level.2005–2019Suspension
CommonSuspension $1,200–$4,000 to fix

ML/GLE models with the optional Airmatic air suspension develop leaking air struts and eventually a failed compressor. A corner that sags after standing overnight, a slow rise on start-up, or an 'Airmatic - Visit Workshop' message are the signs. Struts and the compressor are expensive on a big SUV, so a neglected Airmatic car can cost thousands to put right; steel-sprung cars avoid this.

Symptoms to notice

  • A corner sagging after standing overnight
  • Slow to rise / uneven ride height on start-up
  • 'Airmatic - Visit Workshop' message
  • Compressor running constantly or failing to run

What to check

Ideally view the car after it has stood overnight - it should sit level. On start-up it should raise promptly and hold. Listen for the compressor labouring, and check for any suspension warning. A low corner means budget for struts.

Where to look: Air struts at each corner and the compressor (front of the vehicle)

Parts involved: Air suspension strut.

Ask the seller

  • “Does it sit level after standing overnight?”
  • “Have any air struts or the compressor been replaced?”
Depends on the exact engine — 2 moreDocumented for a specific engine we could not confirm from what you picked. Check the engine code on the car.
Engine, transmission & cooling1

01Swirl flap / intake carbon clogging and limp mode (OM642 ML/GLE)

On the test drive, confirm the engine revs and pulls freely rather than feeling capped.diesel2005–2019EngineRead the full fault: symptoms, where to look, what to ask the seller
Fluid leaks1

01OM642 3.0 V6 diesel oil cooler seal leak (W164/W166 ML/GLE)

Open the bonnet and look down into the centre-rear of the engine valley for oil wetness.diesel2005–2019Fluid LeaksRead the full fault: symptoms, where to look, what to ask the seller
Other Mercedes-Benz GLE engines and years4 documented issues that do not apply to the one you picked.
Electrical2

01M256 48V ISG belt-alternator-starter failure

Use XENTRY to interrogate 48V EQ Boost control module for ISG and battery fault codes.hybrid2019–2025Electrical
OccasionalElectrical $4,500–$9,500 to fix

Does not apply

The M256 3.0T inline-six uses a 48-volt Integrated Starter-Generator (ISG) mounted on the front of the engine driven by a dedicated belt, replacing the conventional alternator and starter motor. The ISG enables stop-start, mild regenerative braking, and electric boost. Early production units suffer from ISG rotor bearing wear and internal winding failures, compounded by heat exposure from the adjacent engine. Failure modes include loss of stop-start function, 48V system fault warnings, battery charge faults, and in progressive cases complete 48V network shutdown causing loss of belt-driven ancillaries. The 48V lithium-ion battery (EQ Boost battery, behind the rear seat) can also fail independently, requiring a separate diagnosis pathway.

Symptoms to notice

  • EQ Boost or 48V system warning light on instrument cluster
  • Stop-start system permanently disabled with no driver option to restore it
  • Increased fuel consumption from loss of mild hybrid assist
  • 12V charging warning if 48V-to-12V DC/DC converter is also affected
  • Belt squeal or tensioner noise from ISG belt drive

What to check

  1. Use XENTRY to interrogate 48V EQ Boost control module for ISG and battery fault codes.
  2. Check 48V battery state of health and cell balance.
  3. Inspect ISG drive belt for wear and glazing.
  4. Verify 48V bus voltage under light load.
  5. Check for coolant leaks near ISG (water-cooled units).
  6. Review workshop history for any 48V network faults.

Where to look: ISG unit: front of M256 engine, belt-driven on transmission-side (longitudinal installation). 48V EQ Boost battery: behind rear seat base or under load floor depending on variant.

Parts involved: Alternator, Starter motor.

Ask the seller

  • “Has the 48V EQ Boost or ISG system ever triggered a warning or been replaced under warranty?”
  • “Is the stop-start system currently fully operational?”
  • “Has any 48V battery or high-voltage system work been carried out?”
  • “What is remaining factory or extended warranty coverage on the 48V drivetrain components?”

0248V mild-hybrid (ISG) and MBUX faults (V167)

Start the car a few times and watch for any 48V/electrical warning; let stop-start cycle and feel for rough restarts.2019 onwardElectrical
OccasionalElectrical $800–$6,000 to fix

Does not apply

The current GLE (V167) uses 48-volt EQ Boost mild-hybrid petrol and diesel engines. The 48V battery, integrated starter-generator and DC/DC converter are known trouble spots that trigger a '48V onboard electrical system' warning and can leave the car unable to start; some cases are software or a separate 48V ground-cable recall, others need a costly ISG or battery. The MBUX widescreen can also freeze or reboot. Verify no electrical warnings and that updates/recalls are done.

Symptoms to notice

  • '48V onboard electrical system' warning
  • Car won't start / long crank
  • Rough auto-restart at lights
  • MBUX screen freezes or reboots

What to check

  1. Start the car a few times and watch for any 48V/electrical warning; let stop-start cycle and feel for rough restarts.
  2. Work through the MBUX screens and cameras.
  3. Ask whether the 48V ground-cable recall and software updates have been completed.

Where to look: 48V battery and integrated starter-generator; dashboard MBUX displays

Parts involved: Starter motor.

Ask the seller

  • “Has a 48V/electrical warning ever appeared, or a no-start?”
  • “Has the 48V recall and MBUX updates been done?”
Body, brakes, suspension & interior2

01AIRMATIC front air spring bladder failure

Inspect both front air spring bladder sleeves for surface cracking and separation at upper and lower bead seats.2019–2025SuspensionRead the full fault: symptoms, where to look, what to ask the seller

02Water intrusion recall - wet interior and electrical faults (V167)

Press the footwell and boot carpets for damp and sniff for a musty smell.2019 onwardBody & Rust
OccasionalBody & Rust $0–$1,500 to fix

Does not apply

Early V167 GLE (and related GLS) SUVs were recalled because water can get into the vehicle and reach electrical components, potentially causing malfunctions. Combined with the usual blocked sunroof/scuttle drains on a big SUV, this shows as damp carpets, a musty smell, fogged glass or intermittent electrical gremlins. The recall work is free at a Mercedes dealer, so confirm it has been done and that the interior is dry.

Symptoms to notice

  • Damp carpets or musty smell inside
  • Fogged windows slow to clear
  • Intermittent electrical faults or warnings
  • Water in footwells or under floor trim

What to check

  1. Press the footwell and boot carpets for damp and sniff for a musty smell.
  2. Check the VIN with a Mercedes dealer, or ask the seller for proof, that the water-intrusion recall has been completed.
  3. Confirm the sunroof drains are clear.

Where to look: Footwells, boot floor, sunroof/scuttle drains and underfloor electrical modules

Ask the seller

  • “Has the water-intrusion recall been carried out?”
  • “Have the carpets ever been damp or the car had electrical faults?”

Mercedes-Benz GLE faults in detail

Narrowed to the Mercedes-Benz GLE · 2013. Each of these has its own page: the symptoms, where to look, what to ask the seller and what the repair costs. Free, no account needed.

OM642 3.0 V6 diesel oil cooler seal leak (W164/W166 ML/GLE)Major · Fluid LeaksSwirl flap / intake carbon clogging and limp mode (OM642 ML/GLE)Major · Engine

Other Mercedes-Benz models

Mercedes-Benz C-Class41 documented faultsMercedes-Benz A-Class23 documented faultsMercedes-Benz E-Class23 documented faultsMercedes-Benz ML5006 documented faultsMercedes-Benz CLS5 documented faultsMercedes-Benz GL-Class5 documented faults

Mercedes-Benz GLE buyer questions

Is the Mercedes-Benz GLE reliable?

Like any used car, it depends on the specific example and its service history. Across the 7 documented faults for the Mercedes-Benz GLE, the recurring problem areas are electrical, fluid leaks, and suspension. A Mercedes-Benz GLE with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.

What are the most common problems with a used Mercedes-Benz GLE?

We've catalogued 7 known faults for the Mercedes-Benz GLE, covering electrical, fluid leaks, and suspension. All 7 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.

How much do repairs cost on a Mercedes-Benz GLE?

Most single repairs on the Mercedes-Benz GLE fall between $1,200–$4,000 at NZ independent-workshop rates. Some of the 7 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.

Should I get a pre-purchase inspection on a Mercedes-Benz GLE?

Yes. A Mercedes-Benz GLE inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $24.90 far less than the cost of missing one of the faults on this page.