7-Speed Automatic Transmission Assembly for 2015-2017 Mercedes-Benz

A quick look at your own vehicle makes sure the right transmission shows up:

• Confirm vehicle is AWD (4MATIC) by checking badging, window sticker, or VIN code M005.
• Confirm engine is the 2.0L Turbocharged 4-Cylinder (M274).
• Verify transmission build code has Code A89 (Reduced Friction) requiring Blue fluid.

What the install really takes — plan and budget with confidence:

Special tools this job needs:

• Mercedes 722.9 bottom-fill adapter (e.g., Assenmacher ATF129 or CTA 7415)
• Fluid transfer pump/dispenser
• Professional diagnostic scan tool (Xentry/DAS, Thinkcar 689BT, or iSCAN NX) capable of SCN coding
• E-Torx (star) socket set
• Engine support bar/brace
• Torque converter holding tool

Budget for these consumables at install:

• Mercedes-Benz Specification 236.15 (Blue Fluid) ATF (e.g., Mobil ATF 134 FE or Fuchs Titan ATF 7134 FE)
• 9.0 to 10.2 Liters of ATF (for dry fill/torque converter drain)
• Filter & Pan Gasket Kit (including green overflow pipe)
• 6 Aluminum Pan Bolts (one-time-use stretch bolts)
• Torque Converter Seal (front pump/input shaft seal)
• Drain Plug Copper Washer
• Transmission Cooler-Line Flush

What your vehicle’s computers will need after the swap:

What’s involved: SCN Coding, Virginizing, and Adaptive Relearn

The TCM is a Theft-Relevant Part (TRP) locked to the donor vehicle's FBS4 security system. It must be 'virginized' and SCN-coded to the new VIN, or the original mechatronic unit must be swapped into the donor transmission. A shift adaptation relearn is required after installation.

Pro tips for a smooth first start-up — hand them to whoever does the install:

• Torque Converter Seating: Ensure the torque converter is fully seated and engaged onto the front oil pump splines before bolting to the engine to avoid cracking the pump gear.
• Magnesium Case Care: The case is magnesium. Only use correct aluminum bolts for the oil pan and housing-to-case connections. Never use steel bolts or power tools.
• Bottom-Fill Temperature Dance: Fluid level must be set by pumping fluid through the bottom drain plug, running the engine, and monitoring temperature. Remove the fill adapter to let excess fluid drain out of the green overflow pipe at exactly 45°C (113°F).
• Conductor Plate Programming: The unit is inoperable until electronically married to the vehicle.
• Cooler Line Contamination: The cooler and lines must be professionally flushed to prevent debris from the failed unit from contaminating the replacement.

Easy to get right once you know them:

• Ordering for a Rear-Wheel Drive (RWD) Model: AWD transmissions have an integrated transfer case and do not fit RWD models.
• Using the Wrong ATF (Red vs. Blue): Using older Red MB 236.14 fluid instead of the required Blue MB 236.15 fluid causes clutch slippage and failure.
• Reusing the Aluminum Pan Bolts: Reusing these stretch bolts leads to them snapping or backing out, causing catastrophic fluid leaks.
• Skipping the Programming Step: Expecting a plug-and-play install without virginizing/SCN coding or swapping the original TCM, leaving the car in limp mode.
• Assuming a Software Update Will Fix a Mechanical Fault: Attempting to resolve physical valve body or conductor plate wear with software updates.

Not issues with the units on this page — the manufacturer documented these for every transmission of this family, wherever you buy one. Handy for your installer: