Fitment notes: Located in trunk; AGM required for start-stop system; do not substitute with standard lead acid
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Every control module on the 2022-2026 Mercedes-Benz C300 W206 — 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
📍 Transmission housing, driver side lower section
🔧 Xentry Diagnostics + SCN online
⚠️ Integrated with valve body on 9G-TRONIC. Requires transmission adaptation after coding.
Electric Power Steering Control Unit (EPS)2.0 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Steering column, integrated with steering gear
🔧 Xentry Diagnostics + SCN online
⚠️ Requires steering angle sensor calibration and road test after coding.
MBUX Head Unit (HU/MBUX)2.0 hr R&Rsecurity gateway +1.5 hr▸ programming details
📍 Dashboard center, integrated with touchscreen display
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. User profiles and navigation data lost on replacement. Requires online activation.
Electronic Stability Program Control Unit (ESP/ABS)1.8 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Engine compartment, left front near wheel well
🔧 Xentry Diagnostics + SCN online
⚠️ Integrated hydraulic unit. Requires brake bleed and steering angle sensor calibration after replacement.
Climate Control Unit (CCU)1.5 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Dashboard center, behind HVAC control panel
🔧 Xentry Diagnostics
⚠️ Requires HVAC flap calibration after installation.
⚠️ Memory seat positions lost on replacement. Separate module per seat.
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 2026 Mercedes-Benz C300 W206 2.0L I4 Turbo M254 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.