The 2021 GLE350 W167 with the M264 2.0L turbo four-cylinder is plagued by catastrophic engine failures due to crankshaft bearing defects and inadequate oiling under certain conditions. This is Mercedes' most problematic modern powertrain, with failures occurring at shockingly low mileages and requiring complete engine rebuilds or replacements.
M264 Crankshaft Bearing Failure / Spun Bearings
Common · high severity
Typical onset: 20,000-60,000 mi
Symptoms: Sudden knocking or rattling noise from bottom end at idle or under load, Metal shavings in oil or oil filter during service, Low oil pressure warning light, Complete engine seizure in worst cases
Fix: Full engine teardown required. Main and rod bearings fail due to manufacturing defects in crankshaft journals and inadequate oil delivery. Most shops recommend short block replacement rather than rebuild due to crankshaft damage. 18-25 labor hours for short block swap.
Estimated cost: $15,000-22,000
M264 Piston Ring Failure / Carbon Buildup
Common · high severity
Typical onset: 30,000-70,000 mi
Symptoms: Excessive oil consumption (1 quart per 1,000 miles or worse), Blue smoke from exhaust on startup or acceleration, Misfires and rough idle, Check engine light with lean codes or misfire codes
Fix: Piston rings seize in lands due to carbon deposits and weak ring tension from factory. Requires cylinder head removal, honing, new pistons and rings. Often combined with bearing replacement if caught early. 20-28 labor hours.
Estimated cost: $8,000-14,000
9G-Tronic Transmission Oil Cooler Leaks
Occasional · medium severity
Typical onset: 40,000-80,000 mi
Symptoms: Transmission fluid puddles under vehicle near front, Low transmission fluid warnings, Harsh or delayed shifting when fluid level drops, Pink or red fluid visible on oil cooler lines
Fix: Oil cooler develops leaks at crimped line connections or through internal corrosion. Requires cooler replacement and transmission fluid flush. 4-6 labor hours including proper fluid fill procedure.
Estimated cost: $1,200-2,000
Transmission Mount Failure
Occasional · low severity
Typical onset: 50,000-90,000 mi
Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Vibration through floorboard at idle in gear, Excessive driveline movement visible during throttle application
Fix: Rubber transmission mount separates or collapses. Common on all W167 models due to weight of engine-transmission assembly and thin mount design. 2-3 labor hours, requires supporting powertrain.
Estimated cost: $600-900
High-Pressure Fuel Pump Failure
Occasional · medium severity
Typical onset: 35,000-65,000 mi
Symptoms: Extended cranking before starting, especially when hot, Loss of power under acceleration, Check engine light with fuel pressure codes (P0087, P228C), Rough idle or stalling
Fix: M264 high-pressure fuel pump (mounted on cylinder head) fails internally, cannot maintain 2,900+ psi rail pressure. Fuel filter replacement rarely helps. Pump and seal replacement required. 3-4 labor hours.
Estimated cost: $1,800-2,800
Airmatic Air Suspension Compressor Failure
Occasional · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Vehicle sits low, especially at one corner, Compressor runs constantly or excessively, Suspension warning messages on dash, Hissing noise from rear of vehicle
Fix: Air suspension compressor overworks and burns out, often due to leaking air springs or lines. Must diagnose leaks first before compressor replacement. Compressor replacement 2-3 hours, but finding leaks adds time.
Estimated cost: $2,200-3,500
Owner tips
Check oil level every 500 miles religiously — the M264 engine is a time bomb and low oil accelerates bearing failure
Insist on full synthetic 0W-40 and 5,000-mile oil change intervals maximum, regardless of maintenance reminder
Have oil analyzed at every change starting at 20,000 miles to catch bearing material before catastrophic failure
Extended warranty is mandatory on these — engine replacements often exceed vehicle value on used examples
Consider avoiding this generation entirely and opt for the GLE450 with inline-six M256 engine which has no major defects
Absolutely would not buy one used without factory warranty remaining or a comprehensive third-party warranty covering engine internals — the M264 engine failure rate is unacceptable and repairs often total the vehicle.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: AGM battery required; located in engine compartment; do not substitute with standard lead acid
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Every control module on the 2020-2023 Mercedes-Benz GLE350 W167 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Transmission Control Unit (TCU)2.5 hr R&Rsecurity gateway +1.0 hr▸ programming details
⚠️ Factory trailer hitch option. Requires activation coding if retrofitted.
Fuel Pump Control Module (FPCM)0.5 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Left rear cargo area, near SAM-R
🔧 Xentry or scan tool
⚠️ Self-adapts after installation. Fault code clearing required.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2021 Mercedes-Benz GLE350 W167 2.0L I4 Turbo M264 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.