Every control module on the 2020-2026 Mercedes-Benz CLA45 AMG — 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&R security gateway +1.2 hr ▸ programming details
📍 Transmission bell housing, driver side
🔧 Xentry with MBD account and SCN authorization
⚠️ AMG Speedshift DCT 8-speed (2020+). Requires transmission fluid drain. Enhanced security, online authorization mandatory.
Central Gateway Module (CGW) 2.0 hr R&R security gateway +2.0 hr ▸ programming details
📍 Dashboard, center behind instrument cluster
🔧 Xentry with MBD account and SCN authorization
⚠️ Enhanced security gateway. Replacement requires dealer-level authorization and complete vehicle reconfiguration.
4MATIC Control Unit (4M) 2.0 hr R&R security gateway +1.0 hr ▸ programming details
📍 Transmission tunnel, center under vehicle
🔧 Xentry with MBD account and SCN authorization
⚠️ CLA45 4MATIC+ models. Enhanced all-wheel drive system. Online authorization required.
Electric Power Steering Control Unit (EPS) 1.8 hr R&R security gateway +1.0 hr ▸ programming details
📍 Steering column, below instrument panel
🔧 Xentry with MBD account and SCN authorization
⚠️ Steering wheel removal required. Enhanced security. Steering angle sensor calibration mandatory.
Climate Control Module (CCM) 1.8 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Dashboard, center behind HVAC controls
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Basic adaptation possible with high-end aftermarket tools. Full feature coding requires Xentry.
MBUX Head Unit (MBUX) 1.8 hr R&R security gateway +1.0 hr ▸ programming details
📍 Center dashboard, behind display screen
🔧 Xentry with MBD account and SCN authorization
⚠️ MBUX system with enhanced features. Online authorization required for full feature activation.
Electronic Ignition Switch (EIS) 1.5 hr R&R security gateway +2.0 hr ▸ programming details
📍 Steering column, ignition switch housing
🔧 Xentry with MBD account and SCN authorization
⚠️ Part of enhanced security triangle. All keys must be reprogrammed. Dealer-only procedure with online authorization.
Electronic Stability Program Control Unit (ESP/ABS) 1.5 hr R&R security gateway +1.0 hr ▸ programming details
📍 Engine bay, left front corner near fender
🔧 Xentry with MBD account and SCN authorization
⚠️ Integrated hydraulic unit. Brake bleeding required. Enhanced security gateway protection.
Motor Electronics / Engine Control Unit (ME/ECU) 1.2 hr R&R security gateway +1.2 hr ▸ programming details
📍 Engine bay, left side firewall near brake master cylinder
🔧 Xentry with MBD account and SCN authorization
⚠️ M139 2.0L turbo engine (CLA45 S). Enhanced security gateway protection. VIN-locked with online authorization required.
Radar Sensor / DISTRONIC Control Unit (RSU) 1.2 hr R&R security gateway +1.5 hr ▸ programming details
📍 Front bumper, center behind grille
🔧 Xentry with MBD account and SCN authorization
⚠️ Enhanced adaptive cruise and active brake assist. Radar alignment mandatory. Requires alignment rack and targets.
Signal Acquisition and Actuation Module - Rear (SAM-R) 1.2 hr R&R security gateway +1.2 hr ▸ programming details
📍 Trunk, left side panel behind trim
🔧 Xentry with MBD account and SCN authorization
⚠️ Controls rear electrical functions. Enhanced VIN-locking with online authorization.
Driver Assistance Package Control Unit (DAP) 1.2 hr R&R security gateway +1.0 hr ▸ programming details
📍 Dashboard, center behind instrument cluster area
🔧 Xentry with MBD account and SCN authorization
⚠️ Coordinates multiple driver assistance systems. Online authorization required.
Camera Control Unit / Surround View (CCU) 1.0 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Trunk, near license plate area; additional cameras in mirrors and front
🔧 Xentry with calibration
⚠️ 360-degree camera system. Multi-camera calibration required after replacement. Requires alignment mat.
Instrument Cluster (IC) 1.0 hr R&R security gateway +1.2 hr ▸ programming details
📍 Dashboard, behind steering wheel
🔧 Xentry with MBD account and SCN authorization
⚠️ Digital cluster. Part of security triangle. Mileage programming requires dealer authorization with online verification.
Door Control Module (DCM) 1.0 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Inside each door, lower section
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Controls windows, mirrors, locks per door. Window initialization required after replacement.
Restraint Systems Control Unit (SRS) 0.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Center console, beneath center armrest
🔧 Xentry with MBD account and SCN authorization
⚠️ Battery disconnect required. Enhanced security, online authorization mandatory for crash data management.
Tailgate Control Module (TGM) 0.8 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Trunk lid, behind trim panel
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Power trunk models. Position learning required after replacement.
Fuel Pump Control Module (FPCM) 0.8 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Trunk, under floor panel near fuel tank
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Basic adaptation possible with high-end aftermarket tools.
Intelligent Light System Control Unit (ILS) 0.8 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Engine bay, behind each headlight assembly
🔧 Xentry with SCN coding
⚠️ LED or Multibeam LED system. Headlight range calibration and matrix function coding required.
Telematics Communication Module (TCM) 0.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Trunk, right side panel or under rear seat
🔧 Xentry with MBD account and SCN authorization
⚠️ Mercedes me connect system. Requires subscription activation and online authorization after coding.
Parktronic Control Unit (PTS) 0.7 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Trunk, right side panel
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Parking sensor system. Calibration recommended after replacement.
Seat Control Module (SCM) 0.6 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Under driver and passenger seats
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Memory seat and AMG performance seats. Basic adaptation possible with high-end aftermarket tools.
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?
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