Some 2024 GMC Hummer EV Units Will Need A Serial Data Gateway Module Replacement

GM has issued a service update related to fixing an issue with the serial data gateway module in certain affected units of the 2024 GMC Hummer EV.

Tagged with service update number N242470190, some 2024 GMC Hummer EV units – both the Pickup and SUV – may been built with a Serial Data Gateway Module (SDGM) that’s incompatible with the vehicle’s software. The correction outlined in the service update involves EV-certified GM dealers replacing the SDGM (part number 13552977) in affected units.

The number of units affected is unclear at this point. The program is in effect until December 31^st, 2026. Notably, some 2024 Chevy Silverado EV and 2024 Chevy Corvette units are involved in the service bulletin.

Both Hummer EV models utilize Ultium battery and Ultium Drive motor technologies to provide motivation to all four wheels of the vehicle. Depending on trim level and options, a Hummer EV may feature either a 20-module or 24-module battery pack, the latter available only on the Pickup, paired with with either a two-motor or three-motor setup.

For the GMC Hummer EV Pickup, power output amounts to 570 horsepower for the 2 and 2X trim levels. The 3X trim develops 830 horsepower if it is equipped with the 20-module battery while cranking out 1,000 horsepower if the truck is optioned with the 24-module battery. With the 20-module battery as its only choice, the Hummer EV SUV is limited to 570 horsepower in the 2X trim level or 830 horsepower in the 3X and Edition 1 variants.

Towing for the Pickup is rated at 12,000 pounds for the 20-module battery, two-motor configuration, 8,500 pounds for the 20-module or 24-module, three-motor setup, and 7,500 pounds for any configuration equipped with the Extreme Off-Road Package (RPO code Z6X). SUV tow rating is 10,000 pounds with the two-motor configuration and 7,500 pounds with three motors and/or the Extreme Off-Road Package.

Both GMC Hummer EV configurations ride on the wide-body variant of the GM BT1 platform, which is produced at the GM Factory Zero plant in Michigan.