2016-2025 Mercedes-Benz GLE Problems & Issues

The M278 4.7L biturbo V8 used in the GLE 550 4MATIC (W166/C292) has a complex timing drive with one primary chain and two secondary chains, each with its own tensioner. On early engines the secondary chain tensioners lose oil pressure during shutdown because they lack anti-drainback check valves, so on cold start the chains and camshaft adjusters run momentarily dry and rattle loudly for the first 2-5 seconds until oil pressure builds. Left unaddressed, chain slack, worn guide rails, and worn camshaft adjusters can advance to camshaft-correlation faults and, in the worst case, timing jump. The same secondary-tensioner start-up rattle also occurs on the M276 V6; Mercedes service information (XENTRY TIPS LI05.10-P-056435) covers rattles in the secondary tensioner area, with the repair replacing the left and right secondary tensioners and installing check valves, which very early engines may lack.

The W166 GLE 250d (OM651 2.1L twin-turbo I4) and GLE 350d (OM642 3.0L V6) (2016-2019) have a documented pattern of turbocharger bearing collapse and EGR cooler failure, typically appearing between roughly 75,000 and 95,000 miles. Frequent short trips and DPF regeneration cycles cause oil coking in the turbo, leading to sudden power loss, limp mode, whining/grinding and blue smoke. Separately, thermal stress cracks the EGR cooler, contaminating engine oil with coolant (milky oil-cap residue, unexplained coolant loss, misfires). Injector coking on the OM651 compounds rough running and misfires. This is distinct from the routine DPF-regeneration issue already catalogued.

The GLE uses fluid-filled (hydraulic) engine and transmission mounts to isolate NVH. These are a known consumable that ruptures and leaks its damping fluid, often well before 60-70k miles. A collapsed mount transmits noticeable vibration through the steering wheel, seats, and floor at idle/in-gear, plus a thump or clunk when shifting or accelerating. A dark oily stain under the mount confirms rupture. Ignoring it can chafe hoses/belts and accelerate driveline wear.

The W166 GLE 350 and GLE 400 (2016-2018, M276 3.0L/3.5L V6) share the well-known M276 camshaft-adjuster problem. The variable-valve-timing camshaft adjusters and their magnets/solenoids wear, allowing the cams to fall out of time. Symptoms include a 2-3 second rattle on cold start, rough running, and check-engine codes such as P0010-style adjuster faults; owners report codes like P002177 with cams found advanced/out of time. Left unaddressed, a worn adjuster can cause poor timing control and driveability problems.

GLE models equipped with the EQ Boost 48-volt mild-hybrid system (GLE 450, GLE 450d, GLE 580 and AMG variants on the W167 platform, plus the GLE 350 from the 2024 model year) commonly trigger a '48V Battery Malfunction' or 'Hybrid System Error' warning. The integrated starter-generator (ISG) and 48V lithium-ion battery, along with the DC/DC converter, are known weak points. Owners report sudden loss of drive power on the motorway, disabled stop/start, weak acceleration and repeated stalling, sometimes resolving only after the car is powered down for 10-15 minutes. A February 2021 Mercedes TSB (reissued December 2021, with a follow-up in March 2022) acknowledged that software, hardware, cooling or false-positive detection faults can cause the 48V battery to disconnect itself. Many owners report multiple unsuccessful dealer visits and weeks of downtime, with the fault often persisting under warranty.

The GLE's full-LED / MULTIBEAM headlights are ventilated for heat, but when the factory seal or housing gasket fails, humid air enters and heavy condensation forms — large droplets and standing water at the bottom of the housing (not the light misting Mercedes considers normal). Because the LED modules and ballast/control electronics are not individually serviceable, trapped moisture corrodes them and causes flicker, partial-out DRL/turn segments, or complete headlight failure, forcing a very expensive full assembly replacement.

GLE plug-in hybrids (W166 550e; W167 350de diesel-PHEV and 450e) frequently show AC-charging faults: charging starts then stops and restarts, a red plug icon, or the car refuses to accept a charge at home/wallbox. Documented triggers include the vehicle halting when the voltage difference between supply phases exceeds ~19V, a weak 12V battery (below ~12.4V the car can't initiate HV charging), a stuck/corroded charge-port latch, or software glitches throwing false charging warnings.

The GLE uses a small secondary AGM 'auxiliary' battery (separate from the main starter battery and the 48V mild-hybrid battery) that stabilizes voltage for the electrical/stop-start system. It is a known wear item that typically dies at 4-6 years, throwing a persistent 'Auxiliary battery malfunction – Visit workshop' message. On W166 (2016-2019) it lives under the rear seat / luggage area; on W167 it is in the engine bay area. Symptoms include the dash warning, flaky start-stop, random electrical gremlins, and occasionally a no-start.

The infotainment system (COMAND on 2016-2019, MBUX on 2020+) freezes or reboots. The COMAND hard drive fails over time while the MBUX system is susceptible to software glitches with connected phones.

The AIRMATIC compressor fails prematurely on the GLE, typically after one or more air springs develop slow leaks. The heavy SUV puts more stress on the compressor than sedan applications, accelerating wear.

Both W166 (2016-2019) and W167 (2020+) GLEs wear out the front lower control arm bushings. The lower arm carries multiple rubber bushings (including a rear 'lollipop' mount to the body) that tear with age, producing a clunk/knock over bumps, a wandering or vague feeling in the steering, and uneven front tire wear. It is one of the most common GLE front-end noise complaints and shows up regardless of whether the car has AIRMATIC or steel springs.

Recall 21V-288 directly covers certain model-year 2020-2021 GLE-Class vehicles whose air-conditioning drain hoses might be incorrectly installed, allowing condensation water into the passenger compartment. Water in the front footwells can corrode or short electrical components and affect eCall, locking, starting or limp-home operation. The report lists 4,325 GLE 350, 1,045 GLE 450, three GLE 580 and one 2021 AMG GLE 53 vehicle; those are recall populations, not owner-report totals.

The GLE power tailgate uses a motorized spindle drive on the passenger side plus a gas strut on the driver side, managed by a dedicated Tailgate/rear-compartment control module. A very common complaint is the gate opening a few inches then stopping or immediately re-closing, intermittent operation, or the gate not moving at all. Causes range from a weak battery/blown fuse (F152 30A, F154 40A) to a failed spindle-drive motor to a control-module internal error (fault code B224E49).

Recall 21V-071 directly covers certain model-year 2020-2021 GLE 350 and GLE 450 vehicles whose ESP software might not meet current production specifications and FMVSS 126. In a specific rapid evasive maneuver, torque may be applied to a front wheel and pull the vehicle to one side, increasing crash risk. The report lists 37,383 GLE 350 and 4,451 GLE 450 vehicles; those are recall populations, not owner-report totals.

On the W167 GLE (2020-2024), the front radar sensor behind the grille that feeds Distronic adaptive cruise control, Active Brake Assist and PRE-SAFE frequently faults, throwing 'Pre-Safe Functions Currently Limited' and disabling those safety systems. Code P2583 indicates the front radar is offline. Common causes are a dirty or snow/ice-blocked sensor, sensor misalignment after minor front-end impacts, and wiring/connector corrosion in the harness (W167 harness part A1675401443) near the right front bumper; a fault in the 48V system can also cascade into ADAS errors. The car remains drivable but loses automatic emergency braking and adaptive cruise.

GLE owners (W166 and W167) report sudden loss of electric power steering assist, sometimes immediately after engine start and sometimes intermittently while driving, accompanied by the red dashboard message "Power Steering Malfunction - See Operator's Manual." Steering becomes very heavy, especially at low/parking speeds. Because EPS relies on stable voltage, CAN/FlexRay communication, and accurate sensor data, causes are almost always electrical: EPS control-module/torque-sensor faults, a corroded/loose steering-rack ground or harness connection, a blown power-steering pre-fuse, or a weak 12V battery dropping voltage to the EPS motor. NHTSA recall 17V-241 covers 2016 GLE (350/350d/400/300d/550e/43/63) where an insufficiently sealed EPS connector lets water into the control unit and deactivates assist, and TSB MC-10231025 addresses a no-assist-after-start software fault of the N68 EPS control unit on later models. This is an electronic EPS-rack fault, separate from mechanical front control-arm bushing wear.

On diesel GLEs, the SCR/AdBlue emissions system enforces compliance with a start countdown: when it detects a fault it warns 'You can restart the engine X more times,' and once the counter expires the car will not start until the fault is fixed and the counter is reset. The most common root cause is a failed upstream or downstream NOx sensor giving out-of-range readings; other causes are AdBlue crystallization, a blocked dosing valve, or low-quality fluid. Topping up AdBlue does NOT clear the countdown.

The 4MATIC transfer case on 2016+ GLE develops two related failures over time: stretched drive chains (which cause a metallic rattle or grinding noise from under the vehicle, most audible at low speeds or under light acceleration) and worn output-shaft bearings (which produce a whine that changes pitch with vehicle speed). Severe wear can cause torque-distribution problems and, if ignored, eventual transfer case failure requiring full unit replacement.

The rear differential develops a leak at the pinion seal or cover gasket. Fluid loss causes differential whine and, if left unaddressed, can lead to bearing and gear damage from insufficient lubrication.

The diesel particulate filter (DPF) clogs prematurely, especially on vehicles used primarily for short trips. Failed regeneration cycles cause reduced power, increased fuel consumption, and eventually limp mode.

The large panoramic roof has four corner drain tubes that route rainwater down the pillars. Over time the tubes clog with dirt/pollen/debris and the perimeter rubber seals degrade, so water backs up and drips onto the headliner, A-pillars, and front footwells, or pools and causes musty smell/mold. Owners also report a persistent creak/rattle from the roof over bumps caused by loose drip-rail cover clips and dry sunroof tracks. This is distinct from the A/C drain-hose footwell recall – the source here is the roof drains/seals.

The 3.0L M256 inline-six (GLE 450, AMG GLE 53 on the W167) is prone to oil leaks from the oil filter housing/adapter assembly, which integrates the engine oil cooler with coolant passages, making leaks both oil and coolant related. The M256 also relies on an electric coolant pump and an auxiliary electric water pump that can fail, producing erratic cooling behavior and overheating warnings. Because oil and coolant circuits share the adapter, an internal cooler leak can let coolant migrate into the oil and quickly damage the engine.

GLE 350 and GLE 450 models (2020+, 9G-Tronic 9-speed automatic) develop harsh low-gear shifts, clunking, and delayed engagement when selecting Drive or Reverse as the transmission ages. The most common root cause is degradation of the valve-body solenoids and conductor plate, aggravated by Mercedes marketing the ATF as 'lifetime' fill when real-world driving needs service far sooner. Contaminated or degraded fluid accelerates solenoid wear, producing erratic shift quality and occasional limp mode.