Fitment notes: AGM battery required for start-stop system; H6 group may be alternate fitment
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Every control module on the 2021-2026 Buick Envision — 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.
⚠️ Mileage programming required; VIN and configuration must match vehicle; security gateway authentication mandatory
Headlamp Control Module (HCM)0.8 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Engine compartment, behind headlamp assemblies, or integrated into headlamp units
🔧 GM GDS2 or aftermarket
⚠️ Headlamp aiming calibration may be required; adaptive lighting models need configuration
Seat Control Module (SCM)0.6 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Under front seats, driver and/or passenger side
🔧 GM GDS2 or aftermarket
⚠️ Memory seat relearn required if equipped; heated/ventilated seat calibration
Rear Vision Camera Module (RVCM)0.5 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Rear liftgate, integrated into liftgate handle or trim
🔧 GM GDS2 or aftermarket
⚠️ Camera alignment calibration may be needed; dynamic guidelines configuration; surround view on higher trims
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 Buick Envision 2.0L Turbo I4 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.