Every control module on the 2020-2026 Cadillac CT5 — 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) 2.5 hr R&R security gateway +1.0 hr ▸ programming details
📍 Transmission case, driver side or integrated into valve body (10-speed)
🔧 GM Techline Connect + MDI2
⚠️ 10-speed transmissions have integrated TCM requiring valve body removal; adaptive relearn required
Heating, Ventilation and Air Conditioning Control Module (HVAC) 2.0 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Behind instrument panel, center stack area or HVAC case
🔧 GM Techline Connect + MDI2
⚠️ Dual-zone or tri-zone systems; actuator calibration required after installation
Electronic Brake Control Module (EBCM) 1.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Engine compartment, driver side near brake master cylinder or ABS unit
🔧 GM Techline Connect + MDI2
⚠️ Integrated with ABS hydraulic unit; brake bleed and system test required after replacement
Infotainment Control Module / Cadillac User Experience (ICM/CUE) 1.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind center touchscreen display in instrument panel
🔧 GM Techline Connect + MDI2
⚠️ 2020-2021 use CUE; 2022+ use newer ICM platform; VIN and radio theft lock programming required
Body Control Module (BCM) 1.5 hr R&R security gateway +1.2 hr ▸ programming details
📍 Behind instrument panel, driver side kick panel area
🔧 GM Techline Connect + MDI2
⚠️ Controls all body functions; VIN and option configuration critical; all accessories require relearn
Electric Power Steering Control Module (EPSCM) 1.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Steering column or integrated into steering gear assembly
🔧 GM Techline Connect + MDI2
⚠️ Steering angle sensor calibration required after replacement
Transfer Case Control Module (TCCM) 1.5 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Transfer case assembly, driver side (AWD models only)
🔧 GM Techline Connect + MDI2
⚠️ AWD models only; adaptive learning required after replacement
Surround Vision Camera Module (SVCM) 1.2 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind rearview mirror or center of vehicle under body
🔧 GM Techline Connect + MDI2
⚠️ 360-degree camera system; static and dynamic calibration required
Engine Control Module (ECM) 1.2 hr R&R security gateway +1.0 hr ▸ programming details
📍 Engine compartment, driver side firewall area or top of engine
🔧 GM Techline Connect + MDI2
⚠️ VIN programming and security gateway unlock required; seed/key authentication mandatory
Active Chassis Control Module (ACCM) 1.2 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Underbody, center or rear suspension area
🔧 GM Techline Connect + MDI2
⚠️ Performance variants (V-series); active suspension and torque vectoring control
OnStar Communication Module (VCIM) 1.2 hr R&R security gateway +0.8 hr ▸ programming details
📍 Behind instrument panel, center or passenger side, or headliner
🔧 GM Techline Connect + MDI2
⚠️ OnStar subscription activation required; embedded 4G/5G modem; security gateway authentication
Sensing and Diagnostic Module (SDM) 1.0 hr R&R security gateway +0.5 hr ▸ programming details
📍 Center console area, under front seats or center tunnel
🔧 GM Techline Connect + MDI2
⚠️ Battery disconnect required; wait 2+ minutes before handling; crash data retrieval available
Door Control Module (DCM) 1.0 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Inside door panels, typically front doors
🔧 Autel or Launch
⚠️ Window auto-up/down and door lock calibration required
Fuel Pump Control Module (FPCM) 1.0 hr R&R relearn only +0.2 hr ▸ programming details
📍 Fuel tank area, mounted on tank or underbody near tank
🔧 GM MDI2 or Autel
⚠️ Simple relearn procedure; aftermarket tools capable
Gateway Module (GM) 1.0 hr R&R security gateway +1.0 hr ▸ programming details
📍 Behind instrument panel, center area or driver kick panel
🔧 GM Techline Connect + MDI2
⚠️ Security gateway; controls all module communication; critical for security; dealer-only programming
Front/Rear Radar Sensor Module (RSM) 1.0 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Front and rear bumper covers, center position
🔧 GM Techline Connect + MDI2
⚠️ Adaptive cruise and collision avoidance; aim calibration mandatory; may require alignment rack
Magnetic Ride Control Module (MRCM) 1.0 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Rear cargo area, driver side or under rear seat
🔧 GM Techline Connect + MDI2
⚠️ Optional Magnetic Ride Control; damper calibration required
Instrument Panel Cluster (IPC) 0.8 hr R&R security gateway +0.5 hr ▸ programming details
📍 Instrument panel, behind gauge cluster
🔧 GM Techline Connect + MDI2
⚠️ Mileage programming from BCM required; VIN and option configuration mandatory
Headlamp Control Module (HCM) 0.8 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Behind headlamp assemblies or engine compartment near headlamps
🔧 GM Techline Connect + MDI2
⚠️ LED/adaptive headlamp systems; aim calibration may be required
Liftgate Control Module (LGM) 0.8 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Rear liftgate area, inside liftgate trim (sedan models may not have)
🔧 Autel or Launch
⚠️ Power liftgate calibration; not present on sedan variants
Remote Control Door Lock Receiver (RCDLR) 0.8 hr R&R security gateway +0.5 hr ▸ programming details
📍 Behind instrument panel, center or driver side, or rear cargo area
🔧 GM Techline Connect + MDI2
⚠️ Key fob programming and theft deterrent relearn required; security gateway protected
Parking Assist Control Module (PACM) 0.8 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Rear cargo area or behind rear bumper
🔧 GM Techline Connect + MDI2
⚠️ Ultrasonic sensor calibration required after replacement
Trailer Interface Control Module (TICM) 0.6 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Rear of vehicle, near hitch area or under rear bumper
🔧 Autel or Launch
⚠️ Optional equipment; trailer brake and lighting control
Seat Control Module (SCM) 0.5 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Under front seats, driver and/or passenger side
🔧 Autel or Launch
⚠️ Memory seat calibration; aftermarket tools generally 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?
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