Every control module on the 2020-2026 Mercedes-Benz GLC — 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.
Electric Power Steering Control Unit (EPS) 3.2 hr R&R security gateway +1.0 hr ▸ programming details
📍 Steering column, integrated with steering rack assembly
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Steering angle sensor calibration and road test mandatory. Enhanced security gateway.
Transmission Control Unit (TCU) 2.5 hr R&R security gateway +1.2 hr ▸ programming details
📍 Transmission bell housing, driver side
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. 9G-TRONIC transmission. Requires fluid change and adaptation. Enhanced security gateway.
Climate Control Unit (CCU) 2.0 hr R&R dealer / factory tool +0.6 hr ▸ programming details
📍 Behind center dashboard, above center console
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. HVAC system calibration and actuator adaptation. ENERGIZING comfort integration on some models.
Hybrid Control Unit / Battery Management System (HCU/BMS) 2.0 hr R&R security gateway +1.2 hr ▸ programming details
📍 Under rear cargo floor or engine bay (48V mild hybrid models)
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. 48V mild hybrid system (EQ Boost). High-voltage safety procedures required. Battery state-of-health calibration.
4MATIC Control Unit (4M) 2.0 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Under vehicle, near transfer case (4MATIC models only)
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. AWD system adaptation and torque distribution calibration. 4MATIC models only.
Head Unit / MBUX (HU/MBUX) 1.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Center dashboard, integrated with center touchscreen
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. MBUX system (10.25" or 11.9" display). Navigation, voice control, and user profile initialization required.
Central Gateway Module (CGW) 1.5 hr R&R security gateway +1.5 hr ▸ programming details
📍 Dashboard, left side near fuse box
🔧 Xentry Diagnostics + SCN coding
⚠️ Enhanced security gateway. Replacement requires complete vehicle network reconfiguration. All modules may need re-coding.
Electronic Stability Program Control Unit (ESP/ABS) 1.5 hr R&R security gateway +0.8 hr ▸ programming details
📍 Engine bay, left front near fender
🔧 Xentry Diagnostics + SCN coding
⚠️ Integrated hydraulic unit. Brake bleeding required. VIN-locked with enhanced security.
Electronic Ignition Switch (EIS) 1.5 hr R&R security gateway +1.5 hr ▸ programming details
📍 Steering column, ignition switch area
🔧 Xentry Diagnostics + SCN coding
⚠️ Part of security triangle. Key programming mandatory. VIN-locked, requires online authorization. Enhanced security.
Radar Sensor / DISTRONIC Control Unit (RSU) 1.5 hr R&R security gateway +1.0 hr ▸ programming details
📍 Front bumper, center behind grille; additional corner radars in bumper
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Radar aim calibration mandatory. DISTRONIC PLUS, Active Brake Assist, and blind spot functions. Enhanced security.
Night View Assist Control Unit (NVA) 1.4 hr R&R dealer / factory tool +0.6 hr ▸ programming details
📍 Front bumper, center behind grille (infrared camera)
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Infrared camera calibration required. Optional equipment on higher trims.
Signal Acquisition and Actuation Module - Roof (SAM-Roof) 1.3 hr R&R dealer / factory tool +0.6 hr ▸ programming details
📍 Headliner, above rearview mirror area
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Controls interior lighting, sunroof, rain sensor. Panoramic roof models primarily.
Airmatic / Active Damping System Control Unit (ADS/Airmatic) 1.3 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Front left wheel well area
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Ride height calibration and damper adaptation. Air suspension models only.
Door Control Module (DCM) 1.2 hr R&R dealer / factory tool +0.6 hr ▸ programming details
📍 Inside each door (four modules: FL, FR, RL, RR)
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Window auto-up/down and anti-pinch require relearning. Mirror memory and ambient lighting integration.
Motor Electronics / Engine Control Unit (ME/ECU) 1.2 hr R&R security gateway +1.0 hr ▸ programming details
📍 Engine bay, left side firewall near brake master cylinder
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked, requires online SCN retrieval. Enhanced security gateway protection. 48V mild hybrid integration on some models.
Camera Control Unit / Surround View (CCU) 1.1 hr R&R dealer / factory tool +0.7 hr ▸ programming details
📍 Behind rearview mirror or integrated in mirror base
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Multi-camera system calibration. Lane detection and traffic sign recognition. Windshield replacement requires recalibration.
Tailgate Control Module (TGM) 1.0 hr R&R dealer / factory tool +0.6 hr ▸ programming details
📍 Tailgate, left side panel
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Power liftgate height and speed adaptation. Hands-free EASY-PACK function calibration if equipped.
Trailer Module (TRM) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Rear cargo area, near hitch receiver
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Trailer sway control and lighting integration. Factory tow package only.
Instrument Cluster (IC) 1.0 hr R&R security gateway +0.8 hr ▸ programming details
📍 Dashboard, behind steering wheel
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked, part of security triangle. Digital cluster (12.3" display). Mileage programming requires dealer authorization.
Fuel Pump Control Module (FPCM) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Under vehicle, near fuel tank
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Communicates with SAM-R and ECM. Fuel system pressure test required after replacement.
Parktronic Control Unit (PTS) 0.9 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Rear bumper, center behind license plate area
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Sensor calibration required. Integrates with 360° camera and Active Parking Assist with PARKTRONIC.
Telematics Communication Module (TCM) 0.9 hr R&R security gateway +0.6 hr ▸ programming details
📍 Rear cargo area, left side panel or under rear seat
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. 4G LTE or 5G connectivity. Mercedes me connect subscription activation and cellular provisioning required.
Restraint Systems Control Unit (SRS) 0.8 hr R&R security gateway +0.7 hr ▸ programming details
📍 Center console, under front seats mounting area
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. PRE-SAFE integration. Crash data clearing and seat sensor calibration required.
Intelligent Light System Control Unit (ILS) 0.8 hr R&R dealer / factory tool +0.6 hr ▸ programming details
📍 Each headlight assembly (left and right modules)
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. MULTIBEAM LED or Digital Light. Headlight aim and camera input calibration required.
Seat Control Module (SCM) 0.7 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Under each front seat (driver and passenger modules)
🔧 Xentry Diagnostics + SCN coding
⚠️ VIN-locked. Memory seat positions and massage function require relearning. Occupancy sensor integration.
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.