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.