Every control module on the 2024-2026 BMW M850i — 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) 3.5 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 and recharge needed
Electronic Transmission Control (TCU) 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
Head Unit Operating System 8 (HU-OS8) 2.0 hr R&R security gateway +1.0 hr ▸ programming details
📍 Behind center dashboard display
🔧 BMW ISTA + ICOM Next
⚠️ iDrive 8 system; display removal required; FSC codes for navigation/features
Electric Power Steering (EPS) 2.0 hr R&R security gateway +0.8 hr ▸ programming details
📍 Steering column, under dashboard
🔧 BMW ISTA + ICOM Next
⚠️ Steering angle sensor calibration required after coding
Transfer Case Control (VTG) 2.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Transfer case housing, center undercarriage
🔧 BMW ISTA + ICOM Next
⚠️ xDrive models only; fluid service recommended during replacement
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 key 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
Top View Camera Module (KAFAS) 1.5 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Behind rearview mirror, windshield
🔧 BMW ISTA + ICOM Next
⚠️ Windshield removal may be required; camera calibration mandatory after replacement
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
Adaptive LED Headlight Module (AHL) 1.5 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 are separate modules
Car Access System (CAS) 1.5 hr R&R security gateway +1.5 hr ▸ programming details
📍 Behind glove box, passenger footwell
🔧 BMW ISTA + ICOM Next
⚠️ All keys must be reprogrammed; ISN sync with DME mandatory; tow-in only if failed
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; enhanced security protocols
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
Door Module (TRSVC) 1.2 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Inside each door panel
🔧 Autel MaxiSys or BMW ISTA
⚠️ Four modules total; window and mirror calibration after replacement
Active Cruise Control Radar (ACC) 1.2 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Front bumper, center behind grille
🔧 BMW ISTA + ICOM Next
⚠️ Radar alignment required after replacement; bumper removal necessary
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 tank access required; pressure relief before service
Tailgate Module (HKL) 1.0 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Inside trunk lid
🔧 Autel MaxiSys or BMW ISTA
⚠️ Power trunk calibration required after replacement
Digital Display Key Module (DDK) 1.0 hr R&R security gateway +0.8 hr ▸ programming details
📍 Behind glove box, passenger footwell
🔧 BMW ISTA + ICOM Next
⚠️ Optional equipment; requires Display Key fob pairing after replacement
Electronic Damper Control (EDC) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Trunk, driver side rear panel
🔧 BMW ISTA + ICOM Next
⚠️ Adaptive M suspension models only; ride height calibration required
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 settings lost on replacement
Park Distance Control (PDC) 0.8 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Trunk, rear panel
🔧 Autel MaxiSys or BMW ISTA
⚠️ Sensor calibration required after replacement
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 reactivation may be required; 5G capable
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.