The 2026 GMC Sierra EV AT4 represents GMC's electric truck offering with dual-motor all-wheel drive capability. Built on GM's Ultium platform, this configuration pairs front and rear electric motors for enhanced traction and performance. The AT4 trim focuses on off-road capability while delivering the instant torque characteristic of electric powertrains. This variant requires specific maintenance protocols different from traditional internal combustion trucks, with emphasis on battery thermal management, brake system monitoring due to regenerative braking, and electric drivetrain fluid services.
Dual-motor AWD system provides independent front and rear torque distribution
Ultium battery architecture requires thermal management system fluid maintenance
Regenerative braking system extends traditional brake component service intervals
Electric drive units use specialized gear oil requiring periodic inspection
AT4 off-road package includes specific suspension torque specifications for added components
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Fitment notes: 12V auxiliary battery for vehicle systems; primary propulsion uses high-voltage EV battery pack
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Every control module on the 2026 GMC Sierra EV AT4 — 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.
Battery Energy Control Module (BECM)8.5 hr R&Rdealer / factory tool +1.2 hr▸ programming details
📍 Integrated with Ultium battery pack assembly beneath cabin floor
🔧 GM SPS2 via MDI 2
⚠️ Controls all high-voltage battery management, thermal, and cell balancing. Replacement requires high-voltage safety lockout and battery pack partial disassembly. VIN and vehicle configuration must be programmed.
Rear Drive Unit Control Module (RDUCM)5.8 hr R&Rdealer / factory tool +1.0 hrAT4 dual-motor AWD▸ programming details
📍 Integrated with rear electric drive unit assembly on rear subframe
🔧 GM SPS2 via MDI 2
⚠️ Rear traction motor controller. Requires coordination programming with front DUCM for torque vectoring and AWD operation.
Electric Power Steering Control Module (EPSCM)3.8 hr R&Rdealer / factory tool +0.6 hr▸ programming details
📍 Integrated with steering gear assembly on frame rail below driver footwell
🔧 GM SPS2 via MDI 2
⚠️ Rack-mounted EPS controller. Requires steering angle sensor calibration and VIN programming after replacement.
📍 Behind center of instrument panel, above center console
🔧 GM SPS2 via MDI 2 with security access
⚠️ Central communication hub for all vehicle networks (CAN, Ethernet, LIN). Security gateway requires dealer-level authentication for programming. Critical for all module communication.
Power Tailgate Control Module (PTCM)2.0 hr R&Raftermarket tool +0.4 hrwith MultiPro power tailgate▸ programming details
📍 Inside tailgate structure, center position
🔧 Autel MaxiSys or GM SPS2
⚠️ Controls power operation of MultiPro tailgate including inner gate. Requires position calibration after replacement.
Body Control Module (BCM)1.8 hr R&Rdealer / factory tool +1.0 hr▸ programming details
📍 Behind left side of instrument panel, above fuse block
🔧 GM SPS2 via MDI 2
⚠️ Controls exterior lighting, power distribution, door locks, and body functions. Requires VIN programming and security linking with other modules.
Door Control Module (DCM)1.8 hr R&Raftermarket tool +0.3 hrCrew Cab▸ programming details
⚠️ 17.7-inch diagonal touchscreen system running Google Built-In. Requires VIN programming and feature activation. Aftermarket tools may handle basic functions.
Trailer Brake Control Module (TBCM)1.5 hr R&Raftermarket tool +0.4 hrwith Max Trailering Package▸ programming details
📍 Behind left rear interior trim panel in bed area
🔧 Autel MaxiSys or GM SPS2
⚠️ Integrated trailer brake controller. Requires calibration for trailer weight and brake gain settings.
⚠️ OnStar, connected services, OTA updates, and 5G connectivity. Security-locked; requires dealer activation and subscription linking.
Remote Control Door Lock Receiver (RCDLR)0.8 hr R&Rsecurity gateway +0.8 hr▸ programming details
📍 Behind right side of instrument panel near glove box
🔧 GM SPS2 via MDI 2 with security access
⚠️ Keyless entry and immobilizer controller. Security-locked; requires key fob programming and security linking with BCM.
Rear Vision Camera Module (RVCM)0.6 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Integrated with tailgate handle assembly
🔧 GM SPS2 or Autel
⚠️ Rear-facing camera with washer. Requires alignment calibration with SVCM.
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 GMC Sierra EV AT4 Dual Motor Electric AT4 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.