The 2026 Mercedes-Benz CLE 450 Coupe with 4MATIC all-wheel drive combines a 3.0-liter inline-six turbocharged engine with Mercedes' EQ Boost mild-hybrid technology. This configuration replaces the outgoing E-Class and C-Class Coupes as Mercedes' mid-size two-door offering, delivering refined performance through its integrated starter-generator system that provides additional torque and improved efficiency. The turbo inline-six with 48-volt hybrid assistance requires specific maintenance protocols for both conventional powertrain components and the electrical boost system, making accurate torque specifications and fluid capacities essential for proper service intervals.
3.0L turbocharged inline-6 with integrated EQ Boost 48-volt mild-hybrid system
4MATIC all-wheel drive with rear-biased torque distribution for enhanced handling dynamics
Integrated starter-generator requires specific belt tension specs and electrical system diagnostics
9G-TRONIC nine-speed automatic transmission with hybrid-optimized shift programming
Combines conventional engine oil service with transmission fluid and hybrid system coolant maintenance schedules
Repair Procedures — 2026 Mercedes-Benz CLE 450 Coupe
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Fitment notes: Location: engine compartment (secondary/backup battery separate from the main 12V starter battery) · Purpose: voltage support / backup power for critical electrical systems and electronics during ISG start-stop (restart) events
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Control Modules — 2026 Mercedes-Benz CLE 450 Coupe
Every control module on the 2026 Mercedes-Benz CLE 450 Coupe — 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.
Electric Power Steering Control Unit (EPS)2.8 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Steering column, integrated with steering rack assembly
🔧 Xentry Diagnostics + SCN online
⚠️ Requires steering angle sensor calibration and road test after coding. VIN-locked.
Transmission Control Unit (TCU)2.5 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Transmission housing, driver side near valve body
📍 Under each front seat, driver and passenger side
🔧 Xentry Diagnostics
⚠️ Controls power seat, heating, ventilation, massage. Two modules (driver/passenger).
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.
Maintenance Schedule — 2026 Mercedes-Benz CLE 450 Coupe
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 2026 Mercedes-Benz CLE 450 Coupe 3.0L Inline-6 Turbo + EQ Boost and can vary by trim.
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.