Every control module on the 2024-2026 Audi A4 — 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 Module (TCM / Mechatronic) 4.5 hr R&R dealer / factory tool +1.2 hr ▸ programming details
📍 Inside transmission oil pan (mechatronic unit) for S tronic/DSG
🔧 ODIS Service with online authentication
⚠️ Mechatronic replacement requires transmission fluid change, extensive adaptation, and clutch learning. SGW-locked.
Hybrid Battery Control Module (HV Battery Module) 3.0 hr R&R dealer / factory tool +1.5 hr ▸ programming details
📍 Rear cargo area or under rear seat (PHEV models only)
🔧 ODIS Service with high-voltage certification
⚠️ High-voltage system. Requires certified technician. Component protection and extensive calibration. SGW-locked.
Electric Power Steering Control Module (EPS) 2.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Steering column, integrated with steering rack
🔧 ODIS Service
⚠️ Steering angle sensor calibration required. SGW-locked.
Body Control Module / Onboard Power Supply Control Module (BCM / OBSM) 1.8 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Dashboard left side, integrated with fuse box
🔧 ODIS Service
⚠️ Controls convenience functions, lighting, power distribution. Component protection active. SGW-locked.
MMI Touch Response Control Module (MMI) 1.8 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Dashboard center stack
🔧 ODIS Service
⚠️ Component protection ties to VIN. Navigation/software updates require dealer account. SGW-locked.
ABS/ESC Hydraulic Control Unit (ABS/ESC) 1.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Engine bay, driver side near brake master cylinder
🔧 ODIS Service
⚠️ Brake bleeding required. Component protection active. SGW-locked.
Central Gateway Control Module (Gateway / CGW) 1.5 hr R&R dealer / factory tool +2.0 hr ▸ programming details
📍 Dashboard, left side behind fuse panel
🔧 ODIS Service with online authentication
⚠️ Master security module. Replacement requires VIN programming and all module re-adaptations. Critical SGW component.
Quattro Ultra Control Module (AWD / Quattro Module) 1.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Rear differential area (Quattro models only)
🔧 ODIS Service
⚠️ Active AWD system requires calibration. SGW-locked.
Engine Control Module (ECM) 1.2 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Engine bay, left side near firewall or integrated with hybrid system on PHEV models
🔧 ODIS Service with online authentication
⚠️ Enhanced component protection. Online dealer authentication mandatory. Immobilizer and gateway pairing required.
Climate Control Module / 4-Zone Climatronic (CCM / Climatronic) 1.2 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Dashboard center, behind HVAC control panel
🔧 ODIS Service
⚠️ Enhanced climate functions. Full coding requires ODIS. SGW may restrict functions.
Adaptive Cruise Control Radar Module (ACC Radar) 1.2 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Front bumper, center behind grille
🔧 ODIS Service with radar alignment tool
⚠️ Radar alignment and calibration mandatory. SGW-locked. Requires special alignment procedure.
Airbag Control Module (ACM) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Center console tunnel, beneath center armrest
🔧 ODIS Service
⚠️ Crash data clearing and component protection. SGW-locked.
360-Degree Camera Control Module (Area View) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Rear cargo area or integrated with MMI system
🔧 ODIS Service
⚠️ Multi-camera system requires calibration. Component protection active. SGW-locked.
Door Control Module (DCM) 1.0 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Inside each door (driver, passenger, rear doors)
🔧 ODIS Service or VCDS
⚠️ Window and mirror calibration required. SGW may restrict some aftermarket tools.
Digital Matrix LED Headlight Control Module (AFS / Headlight Modu) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Inside headlight assembly (one per side)
🔧 ODIS Service with camera calibration
⚠️ Digital Matrix LED requires camera-based calibration. Component protection active. SGW-locked.
Kessy Control Module / Keyless Entry (Kessy) 1.0 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Dashboard, center console area
🔧 ODIS Service
⚠️ Key programming and immobilizer adaptation mandatory. Component protection active. SGW-locked.
Blind Spot Radar Module (Side Assist Radar) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Rear bumper, left and right sides behind trim (one per side)
🔧 ODIS Service
⚠️ Radar calibration required. Component protection active. SGW-locked.
Adaptive Air Suspension Control Module (Adaptive Suspension) 1.0 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Rear cargo area, center
🔧 ODIS Service
⚠️ Ride height calibration required. Enhanced damping control. SGW-locked.
Telematics Communication Unit / 5G Module (TCU / Audi Connect) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Rear cargo area, left side behind trim panel
🔧 ODIS Service
⚠️ Requires online activation and subscription pairing. 5G connectivity. SGW-locked.
Seat Memory Control Module (Seat Module) 0.8 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Under front seats (driver and passenger if equipped)
🔧 VCDS or Autel
⚠️ Seat position calibration required. Heated/ventilated/massage functions may need adaptation.
Digital Instrument Cluster / Virtual Cockpit Plus (IC / Cluster) 0.8 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Dashboard, behind steering wheel
🔧 ODIS Service
⚠️ Mileage programming requires dealer authentication. Enhanced graphics and calibration. SGW-locked.
Park Assist Plus Control Module (PLA / Park Assist) 0.8 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Rear cargo area, left side behind trim
🔧 ODIS Service
⚠️ Enhanced parking functions. Sensor and camera calibration required. SGW may restrict aftermarket tools.
Trailer Control Module (Trailer Module) 0.8 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Rear cargo area, left side behind trim (if factory tow package equipped)
🔧 ODIS Service or VCDS
⚠️ Trailer detection and lighting functions. SGW may restrict some functions.
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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