Every control module on the 2018-2026 Mercedes-Benz G63 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 +0.8 hr ▸ programming details
📍 Transmission bell housing, driver side
🔧 Xentry + MBD account + SCN
⚠️ Requires transmission fluid drain; VIN-locked with gateway authentication; adaptive shift learning required.
Signal Acquisition and Actuation Module - Roof (SAM-Roof) 2.5 hr R&R security gateway +0.8 hr ▸ programming details
📍 Roof panel, center above rear seats behind headliner
🔧 Xentry + MBD account + SCN
⚠️ Controls sunroof, interior lighting, and roof-mounted sensors; headliner removal required; VIN-locked.
Central Gateway Module (CGW) 2.0 hr R&R security gateway +2.0 hr ▸ programming details
📍 Dashboard, center behind lower trim panel
🔧 Xentry + MBD account + SCN
⚠️ Critical security module enforcing authentication; replacement requires extensive online authorization and recoding of all modules; extremely difficult without dealer access.
4MATIC Control Unit (4M) 2.0 hr R&R security gateway +0.7 hr ▸ programming details
📍 Transfer case housing, driver side
🔧 Xentry + MBD account + SCN
⚠️ Transfer case fluid drain required; VIN-locked with gateway protection; torque distribution learning required.
Electric Power Steering Control Unit (EPS) 1.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Steering column, lower section near firewall
🔧 Xentry + MBD account + SCN
⚠️ Steering angle sensor calibration and steering wheel alignment required after replacement; VIN-locked with gateway protection.
Head Unit / MBUX (HU/MBUX) 1.8 hr R&R security gateway +0.7 hr ▸ programming details
📍 Center console, behind head unit trim
🔧 Xentry + MBD account
⚠️ VIN-locked; MBUX system requires online activation; navigation and user profiles require recoding.
Electronic Stability Program Control Unit (ESP/ABS) 1.5 hr R&R security gateway +0.7 hr ▸ programming details
📍 Engine bay, left front corner near battery
🔧 Xentry + MBD account + SCN
⚠️ Requires brake bleeding; VIN-locked; gateway-protected; wheel speed sensor calibration mandatory.
Electronic Ignition Switch (EIS) 1.5 hr R&R security gateway +1.5 hr ▸ programming details
📍 Steering column, upper section near start button
🔧 Xentry + MBD account + SCN
⚠️ All keys must be reprogrammed; part of security triangle; gateway-protected; requires online authorization and key synchronization.
Climate Control Unit (CCU) 1.3 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Dashboard, center behind climate control panel
🔧 Xentry + MBD account
⚠️ VIN-locked; requires recoding of climate zones, seat heating/cooling options, and air quality sensor calibration.
Night View Assist Control Unit (NVA) 1.3 hr R&R dealer / factory tool +0.6 hr ▸ programming details
📍 Front bumper, center behind grille
🔧 Xentry + MBD account
⚠️ Infrared camera alignment and calibration required; VIN-locked; pedestrian detection requires recalibration.
Motor Electronics / Engine Control Unit (ME/ECU) 1.2 hr R&R security gateway +1.0 hr ▸ programming details
📍 Engine bay, left side near firewall, below air filter housing
🔧 Xentry + MBD account + SCN
⚠️ VIN-locked with enhanced security gateway protection; requires online authorization from Mercedes servers. Part of security triangle.
Radar Sensor / DISTRONIC Control Unit (RSU) 1.2 hr R&R security gateway +0.8 hr ▸ programming details
📍 Front bumper, center behind grille
🔧 Xentry + MBD account + SCN
⚠️ Radar alignment and calibration required using special target; VIN-locked; gateway-protected; ADAS recalibration mandatory.
Instrument Cluster (IC) 1.2 hr R&R security gateway +0.8 hr ▸ programming details
📍 Dashboard, behind steering wheel
🔧 Xentry + MBD account + SCN
⚠️ Mileage programming requires dealer authorization and online verification; part of security triangle with ECM and EIS; gateway-protected.
Fuel Pump Control Module (FPCM) 1.2 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Under vehicle, near fuel tank
🔧 Xentry or Autel MaxiSys
⚠️ Fuel system depressurization required before removal; basic adaptation possible with aftermarket tools.
Tailgate Control Module (TGM) 1.2 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Tailgate, left side behind trim panel
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Power tailgate height and speed adaptation required; kick sensor calibration if equipped.
Airmatic / Active Body Control Module (ABC/ADS) 1.2 hr R&R dealer / factory tool +0.7 hr ▸ programming details
📍 Rear cargo area, right side near SAM-R
🔧 Xentry + MBD account
⚠️ Ride height calibration and suspension sensor learning required after replacement; VIN-locked.
Restraint Systems Control Unit (SRS) 1.0 hr R&R security gateway +0.6 hr ▸ programming details
📍 Center console, below shifter assembly
🔧 Xentry + MBD account + SCN
⚠️ Battery disconnect mandatory; crash data clearing requires dealer tool; VIN-locked with gateway protection.
Camera Control Unit / Surround View (CCU) 1.0 hr R&R dealer / factory tool +0.6 hr ▸ programming details
📍 Rear cargo area, center behind trim panel
🔧 Xentry + MBD account
⚠️ Camera calibration and alignment required; 360-degree view system requires all camera angles to be recalibrated.
Door Control Module (DCM) 1.0 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Each door, lower section behind trim panel
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Window auto-up/down relearn required; soft-close function needs adaptation; keyless entry sensors require calibration.
Trailer Module (TRM) 0.9 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Rear frame rail, near hitch receiver
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Trailer light and brake controller adaptation required; some aftermarket tools can perform basic coding.
Parktronic Control Unit (PTS) 0.8 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Rear bumper, center behind trim
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Sensor calibration required; less restrictive coding than powertrain modules; some aftermarket tools can code.
Telematics Communication Module (TCM) 0.8 hr R&R security gateway +0.5 hr ▸ programming details
📍 Rear cargo area, left side panel
🔧 Xentry + MBD account
⚠️ Requires cellular carrier activation and Mercedes me connect subscription activation after replacement; VIN-locked.
Intelligent Light System Control Unit (ILS) 0.7 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Each headlight assembly, rear housing
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Headlight aim calibration required; adaptive LED function requires coding; some aftermarket tools can perform basic coding.
Seat Control Module (SCM) 0.7 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Under each front seat, driver and passenger
🔧 Xentry or Autel MaxiSys Ultra
⚠️ Seat memory positions lost; recoding restores memory function; massage and ventilation features require adaptation.
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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