🌍 International coverage, work in progress. This Russian-market vehicle is part of our hand-curated international catalog. We are filling in labor times, torque specs and fluids as fast as we can verify them, so some numbers may be missing or marked estimated for now. Do you work on these vehicles in the EU, Russia, or the JDM scene? Help us get it right: send real shop times or corrections to [email protected], or request the data you need and it joins the verification queue.
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2015 MERCEDES-BENZ ML550 W166

4.6L V8 BiTurbo M278•AWD•AUTOMATIC•gas•M278•turbo
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Every control module on the 2012-2015 Mercedes-Benz ML550 W166 — 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.
Electronic Transmission Control Module (TCM)2.5 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Transmission bell housing, driver side
🔧 Xentry/DAS with SCN
⚠️ Requires transmission fluid drain. VIN-locked; SCN coding mandatory. Adaptive values must be reset.
4MATIC Control Unit (4M)2.5 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Transfer case, mounted on housing
🔧 Xentry/DAS
⚠️ Controls AWD torque distribution. Requires transfer case access; may need exhaust removal.
Electric Power Steering Control Unit (EPS)2.0 hr R&Rdealer / factory tool +0.7 hr▸ programming details
📍 Steering column, lower section
🔧 Xentry/DAS with SCN
⚠️ Steering angle sensor calibration required after replacement. VIN-locked.
Central Gateway Module (CGW)2.0 hr R&Rdealer / factory tool +1.5 hr▸ programming details
📍 Dashboard, behind instrument cluster
🔧 Xentry/DAS with SCN
⚠️ Controls CAN bus routing. Replacement requires extensive recoding of all modules. Rarely fails.
COMAND Control Unit (COMAND)2.0 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Dashboard, center stack behind head unit
🔧 Xentry/DAS
⚠️ Navigation DVD drive often fails. Coding required for vehicle-specific features.
Night View Assist Control Unit (NVA)1.8 hr R&Rdealer / factory tool +0.7 hr▸ programming details
📍 Front bumper, center behind grille
🔧 Xentry/DAS with SCN
⚠️ Optional infrared camera system. Rare option; requires specialized calibration.
Electronic Stability Program Control Unit (ESP)1.5 hr R&Rdealer / factory tool +0.7 hr▸ programming details
📍 Engine compartment, left front near fender
🔧 Xentry/DAS with SCN
⚠️ Integrated hydraulic unit. Brake bleeding required after replacement. VIN-locked.
Signal Acquisition Module - Rear (SAM-R)1.5 hr R&Rdealer / factory tool +1.0 hr▸ programming details
📍 Rear cargo area, left side panel behind trim
🔧 Xentry/DAS with SCN
⚠️ Controls rear lighting, fuel pump relay, trailer module. VIN-locked.
Climate Control Module (CCM)1.5 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Dashboard, center stack behind climate controls
🔧 Xentry/DAS
⚠️ VIN-locked. Dual-zone or tri-zone variants require specific coding.
Electronic Ignition Switch (EIS)1.5 hr R&Rdealer / factory tool +1.2 hr▸ programming details
📍 Steering column, upper shroud
🔧 Xentry/DAS with SCN
⚠️ Part of security triangle. All keys must be reprogrammed. Requires online Mercedes authorization.
DISTRONIC PLUS Radar Sensor (RSU)1.5 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Front bumper, center behind grille
🔧 Xentry/DAS with SCN
⚠️ Adaptive cruise control. Requires radar alignment after replacement or front-end collision repair.
Door Control Module (DCM)1.2 hr R&Raftermarket tool +0.4 hr▸ programming details
📍 Each door (four modules total)
🔧 Autel/Launch
⚠️ Controls windows, mirrors, locks. Door panel removal required. Window initialization needed.
Motor Electronics (ME-SFI)1.2 hr R&Rdealer / factory tool +1.0 hr▸ programming details
📍 Engine compartment, left side firewall near brake booster
🔧 Xentry/DAS with SCN
⚠️ VIN-locked; requires SCN coding and EIS pairing. Part of security triangle with EIS and cluster.
Airmatic Control Unit (ADS)1.2 hr R&Rdealer / factory tool +0.6 hr▸ programming details
📍 Rear cargo area, left side near SAM-R
🔧 Xentry/DAS
⚠️ Controls air suspension. Ride height calibration required after replacement.
Instrument Cluster (IC)1.0 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Dashboard, behind steering wheel
🔧 Xentry/DAS with SCN
⚠️ Part of security triangle. Mileage programming requires dealer authorization. VIN-locked.
Intelligent Light System Control Unit (ILS)1.0 hr R&Raftermarket tool +0.4 hr▸ programming details
📍 Each headlight assembly (left and right)
🔧 Autel/Launch
⚠️ Bi-Xenon or LED. Headlight range adjustment required after replacement.
Tailgate Control Module (TGM)1.0 hr R&Raftermarket tool +0.3 hr▸ programming details
📍 Tailgate, left side behind trim panel
🔧 Autel/Launch
⚠️ Power liftgate models only. Liftgate position relearn required after replacement.
Parktronic Control Unit (PTS)1.0 hr R&Raftermarket tool +0.3 hr▸ programming details
📍 Rear bumper, center behind trim
🔧 Autel/Launch
⚠️ Sensor calibration required. Most aftermarket tools can code.
Restraint Systems Control Unit (SRS)0.8 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Center console, beneath center armrest
🔧 Xentry/DAS with SCN
⚠️ Battery disconnect mandatory. VIN-locked; crash data must be cleared if present.
Rear View Camera Control Unit (RVC)0.8 hr R&Raftermarket tool +0.3 hr▸ programming details
📍 Tailgate, integrated with camera assembly
🔧 Autel/Launch
⚠️ Camera calibration lines may require adjustment in COMAND settings.
Fuel Pump Control Module (FPCM)0.8 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Rear cargo area, right side near fuel tank
🔧 Xentry/Autel
⚠️ Simple adaptation only. Most scan tools can perform relearn.
Seat Control Module (SCM)0.8 hr R&Raftermarket tool +0.3 hr▸ programming details
📍 Under each front seat (driver and passenger)
🔧 Autel/Launch
⚠️ Controls memory, heating, ventilation. Seat removal required for access.
Telematics Communication Module (TCM)0.8 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Rear cargo area, right side panel
🔧 Xentry/DAS
⚠️ mbrace system. Requires subscription activation after replacement.
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.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years.
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