Unlock any single procedure for $3 — or become the founding sponsor and we generate every common job on this Silverado 3500HD, with your name on each one.
Fitment notes: HD truck application; AGM battery recommended for high electrical demands
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Every control module on the 2020-2026 Chevrolet Silverado 3500HD — 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 rear firewall mounted on bracket
🔧 GDS2/Techline Connect + SGW unlock
⚠️ VIN-specific programming mandatory; SGW authentication requires GM account and proof of ownership. Diesel ECM located passenger side valve cover area.
Remote Control Door Lock Receiver / Theft Deterrent Module (RCDLR)1.2 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Behind instrument panel, center above floor tunnel
🔧 GDS2/Techline Connect
⚠️ Receives key fob signals, manages immobilizer. Key fob programming required after replacement. Push-button start models integrate with BCM.
Trailer Brake Control Module (TBCM)1.2 hr R&Rrelearn only +0.3 hrwith integrated trailer brake controller▸ programming details
📍 Behind left side of instrument panel, near brake pedal bracket
🔧 GDS2 or advanced aftermarket
⚠️ Factory integrated controller. Aftermarket controllers bypass this module. Calibration for trailer weight/brake gain required.
Magnetic Ride Suspension Control Module (MRSCM)1.0 hr R&Rdealer / factory tool +0.5 hrHigh Country and LTZ with Magnetic Ride Control▸ programming details
📍 Frame rail passenger side, forward of rear axle
🔧 GDS2/Techline Connect
⚠️ Controls adaptive dampers in real-time. Requires calibration and ride height sensor inputs. Not available on all trims.
Door Control Module (DCM)1.0 hr R&Rrelearn only +0.3 hrwith power windows/locks (standard on most trims)▸ programming details
📍 Inside driver door, behind trim panel lower section
🔧 GDS2 or advanced aftermarket
⚠️ Driver door module is master; passenger/rear doors may have slave modules on crew cab. Window auto-up/down calibration required.
Transfer Case Control Module (TCCM)1.0 hr R&Rrelearn only +0.3 hr4WD models only▸ programming details
📍 Mounted on transfer case, driver side
🔧 GDS2 or advanced aftermarket
⚠️ Controls shift motor and mode selection. Encoder motor calibration required after replacement. 2WD models have no transfer case or module.
📍 Behind glove box, right side of instrument panel
🔧 GDS2/Techline Connect
⚠️ Provides OnStar, 4G LTE, emergency services, remote commands. Subscription activation required through OnStar after replacement.
Headlamp Control Module (HCM)0.6 hr R&Rno codingwith LED or adaptive headlamps▸ programming details
📍 Behind left headlamp assembly, driver side front fender area
⚠️ Halogen headlamps use BCM control only (no separate HCM). LED/adaptive systems require dedicated module per side.
Bed View Camera Module (BVCM)0.6 hr R&Rno codingwith bed view camera (available on High Country and LTZ)▸ programming details
📍 Integrated with center high-mounted stop lamp (CHMSL) on cab rear
⚠️ Provides cargo bed view on infotainment screen. Camera and module integrated. Video signal to ICM; no separate coding required.
Rear Vision Camera Module (RVCM)0.5 hr R&Rno coding▸ programming details
📍 Integrated with tailgate handle camera assembly
⚠️ Standard equipment (federal mandate 2018+). Camera and module integrated unit. Aiming/guidelines configured via ICM, not RVCM itself.
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 2026 Chevrolet Silverado 3500HD 6.6L V8 L8T Gas and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.