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Fitment notes: High-performance AGM battery required for Blackwing models; located in trunk
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Every control module on the 2022-2026 Cadillac CT4-V Blackwing — 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.
📍 Engine compartment, driver side, mounted to brake modulator assembly near master cylinder
🔧 GM Techline Connect + MDI2
⚠️ Integrated with Brembo brake system on Blackwing. Requires brake bleed, VIN programming, and Performance Traction Management (PTM) calibration. Brake fluid service adds 0.5 hr.
Body Control Module (BCM)2.0 hr R&Rsecurity gateway +1.5 hr▸ programming details
⚠️ Controls all body functions, lighting, keyless entry. Requires VIN programming, security gateway unlock, and configuration of all option content. Key fob relearn required.
Heating, Ventilation and Air Conditioning Control Module (HVAC)1.8 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Behind instrument panel, center stack area, integrated with climate control head unit
📍 Instrument panel, behind gauge cluster lens, driver side
🔧 GM Techline Connect + MDI2
⚠️ 12-inch digital reconfigurable cluster. Requires VIN programming, mileage transfer, and security gateway unlock. Mileage must match vehicle records.
Door Control Module (DCM)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Inside each door, behind door panel near latch assembly
🔧 GM Techline Connect or Autel MaxiSys
⚠️ Controls power windows, locks, mirrors. Four modules (one per door). Window auto-up/down relearn required after replacement.
📍 Integrated into ECM or separate module in engine compartment
🔧 GM Techline Connect + MDI2
⚠️ V-Series launch control and performance features. May be integrated into ECM; requires VIN programming and performance calibration if separate.
Seat Control Module (SCM)0.8 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Under driver and passenger front seats, mounted to seat frame
🔧 GM Techline Connect or Autel MaxiSys
⚠️ Power seats with memory and heating/ventilation. Typically auto-configures; memory relearn may be required. Two modules (driver/passenger).
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.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2025 Cadillac CT4-V Blackwing 3.6L Twin-Turbo V6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.