Every control module on the 2024-2026 BMW 840i — 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.
Integrated Heating/Air Conditioning (IHKA) 2.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind center dashboard, above transmission tunnel
🔧 BMW ISTA + ICOM Next
⚠️ Dashboard removal required; refrigerant recovery/recharge needed
Electronic Transmission Control (EGS) 2.5 hr R&R security gateway +1.0 hr ▸ programming details
📍 Transmission housing, driver side
🔧 BMW ISTA + ICOM Next
⚠️ Adaptation and VIN coding required; transmission fluid service recommended during replacement
Electric Power Steering (EPS) 2.0 hr R&R security gateway +0.8 hr ▸ programming details
📍 Steering column, below dashboard
🔧 BMW ISTA + ICOM Next
⚠️ Steering angle sensor calibration required after coding
Car Access System (CAS) 2.0 hr R&R security gateway +1.5 hr ▸ programming details
📍 Behind dashboard, center console area
🔧 BMW ISTA + ICOM Next
⚠️ All keys must be reprogrammed; DME ISN synchronization mandatory; steering lock adaptation
Front Electronic Module (FEM) 1.8 hr R&R security gateway +1.2 hr ▸ programming details
📍 Behind glove box, passenger footwell
🔧 BMW ISTA + ICOM Next
⚠️ Central body control; replacement requires full vehicle order coding and CAS synchronization
Dynamic Stability Control (DSC) 1.5 hr R&R security gateway +0.8 hr ▸ programming details
📍 Engine bay, driver side near brake master cylinder
🔧 BMW ISTA + ICOM Next
⚠️ Brake bleeding required after replacement; wheel speed sensor calibration
Central Gateway Module (ZGW) 1.5 hr R&R security gateway +2.0 hr ▸ programming details
📍 Behind glove box, passenger footwell
🔧 BMW ISTA + ICOM Next
⚠️ Security gateway; replacement requires dealer-level authentication and full vehicle recoding
Active Cruise Control Radar (ACC) 1.5 hr R&R security gateway +1.0 hr ▸ programming details
📍 Front bumper, center lower grille
🔧 BMW ISTA + ICOM Next
⚠️ Radar alignment with targets required; bumper removal necessary
Head Unit Operating System 8 (HU-OS8) 1.5 hr R&R security gateway +1.0 hr ▸ programming details
📍 Behind center dashboard display
🔧 BMW ISTA + ICOM Next
⚠️ iDrive 8 system; navigation and media coding required; enhanced security protocols
Tailgate Module (HKL) 1.2 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Trunk lid, driver side
🔧 Autel MaxiSys or BMW ISTA
⚠️ Power trunk calibration required if equipped
Instrument Cluster (KOMBI) 1.2 hr R&R security gateway +0.8 hr ▸ programming details
📍 Dashboard, behind steering wheel
🔧 BMW ISTA + ICOM Next
⚠️ Mileage programming requires dealer authentication; VIN coding mandatory
Digital Motor Electronics (DME) 1.2 hr R&R security gateway +1.5 hr ▸ programming details
📍 Engine bay, rear firewall driver side
🔧 BMW ISTA + ICOM Next
⚠️ ISN synchronization with CAS required; dealer authentication mandatory
Adaptive LED Headlight Module (AHL) 1.2 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Each headlight assembly
🔧 BMW ISTA + ICOM Next
⚠️ Headlight aim calibration required after replacement; left and right modules separate
Advanced Crash Safety Module (ACSM) 1.0 hr R&R security gateway +0.5 hr ▸ programming details
📍 Center console, under front seats
🔧 BMW ISTA + ICOM Next
⚠️ Battery disconnect required; crash data must be cleared
Fuel Pump Control Module (EKPM) 1.0 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Trunk, under floor panel near fuel tank
🔧 BMW ISTA + ICOM Next
⚠️ Fuel system depressurization required before service
Door Module (TRSVC) 1.0 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Inside each door panel
🔧 Autel MaxiSys or BMW ISTA
⚠️ Four separate modules; window and mirror calibration after coding
Vertical Dynamics Management (VDM) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Trunk, passenger side rear panel
🔧 BMW ISTA + ICOM Next
⚠️ Integrates DSC, EDC, and steering; calibration required
Electronic Damper Control (EDC) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Trunk, passenger side rear panel
🔧 BMW ISTA + ICOM Next
⚠️ Adaptive suspension calibration; ride height sensor learning required
Park Distance Control (PDC) 0.8 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Trunk, center rear panel
🔧 Autel MaxiSys or BMW ISTA
⚠️ Sensor calibration required after replacement
Seat Module (SM) 0.8 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Under each front seat
🔧 Autel MaxiSys or BMW ISTA
⚠️ Separate modules for driver and passenger; memory seat coding if equipped
Telematics Communication Box (TCB) 0.8 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Trunk, driver side rear panel
🔧 BMW ISTA + ICOM Next
⚠️ ConnectedDrive subscription activation required; 5G capable
Rear View Camera (RFK) 0.5 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Trunk lid, above license plate
🔧 Autel MaxiSys or BMW ISTA
⚠️ Guideline calibration recommended
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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