General Motors
GM 20-module truck pack (170 kWh: Hummer EV, Silverado EV, Sierra EV)
NCMA (nickel-cobalt-manganese-aluminum) cells from Ultium Cells (GM / LG Energy Solution joint venture) · 170 kWh · used in 5 model variants.
Pack reference
Pack overview
Known issues
How this pack ages (industry context)
Industry fleet aggregates: 2.3% average annual capacity loss across 22,700 EVs / 21 models (Geotab, 2026), and 95% range retention at 5 years on average across 30,000+ vehicles (Recurrent, 2026).
OEM warranty floor on this pack: 8 yr / 100k mi to 75% capacity.
Public per-pack degradation curves are not available for most models. Individual results vary materially with climate, charging behavior, and DC fast-charge frequency.
Vehicles using this pack
Battery-Related NHTSA Recalls
Recalls affecting battery, charging, electric propulsion, or thermal-event systems on vehicles using this pack, as of the last complaint-data run. Each campaign names the model generation it was filed against; the summary gives the model years covered.
General Motors, LLC is recalling certain 2026 Cadillac Escalade IQ, Escalade IQL, GMC Sierra EV, Chevrolet Silverado EV, and 2022 GMC Hummer EV Pickup vehicles. The high voltage battery may have an improperly secured internal module component.
Consequence: A loose component may move and damage the high voltage battery, increasing the risk of a fire.
Filed against: GMC Hummer EV 2022-2025; Chevrolet Silverado 1500 2026-2026; GMC Sierra 1500 2026-2026
General Motors, LLC (GM) is recalling certain 2022 GMC Hummer EV and 2023 Cadillac Lyriq vehicles. Certain connections within the high-voltage battery pack may be out of position or incorrectly welded, which can cause a loss of drive power.
Consequence: A loss of drive power can increase the risk of a crash.
Filed against: GMC Hummer EV 2022-2025
General Motors, LLC (GM) is recalling certain 2022 BrightDrop EV600 and 2022-2023 GMC Hummer EV Pickup electric vehicles. The high voltage battery pack enclosure may not be properly sealed, allowing water to enter the pack.
Consequence: Water accumulation in the high voltage battery pack can cause a loss of drive power, increasing the risk of a crash.
Filed against: GMC Hummer EV 2022-2025
For TWD editorial coverage of major recall campaigns, see /recalls/.
Pack family
GM 20-module truck pack (170 kWh: Hummer EV, Silverado EV, Sierra EV) is part of the gm-ultium family. Related packs:
- GM Ultium 12-module pack (102 kWh: Lyriq, Blazer EV RWD and SS, Acura ZDX)
- GM Ultium 10-module pack (85 kWh: Equinox EV, Blazer EV LT and RS, Honda Prologue)
- GM 24-module truck pack (205 kWh: Hummer EV Pickup, Silverado EV, Sierra EV, Escalade IQ)
- GM 14-module truck pack (119 kWh: 2026 Silverado EV and Sierra EV Standard Range)
Frequently Asked Questions
What chemistry is the GM 20-module truck pack (170 kWh: Hummer EV, Silverado EV, Sierra EV)?
The GM 20-module truck pack (170 kWh: Hummer EV, Silverado EV, Sierra EV) uses NCMA (nickel-cobalt-manganese-aluminum) chemistry. Cells are supplied by Ultium Cells (GM / LG Energy Solution joint venture). Cell format: Large-format pouch. Pack architecture: 20 modules; 480 cells at 290 volts nominal in GM's 2025 EPA filings; charges at up to 300 kW on 800-volt DC chargers.
What is the warranty on this pack?
8 years or 100,000 miles, with capacity coverage to 75% of original. Specific terms vary by year and trim; check the manufacturer's warranty booklet for the exact vehicle.
How much does this pack degrade over time?
Industry-wide fleet aggregates show roughly 2.3% average annual capacity loss across 22,700 EVs (Geotab, 2026), with about 95% range retention at five years on average across Recurrent's 30,000+ vehicle fleet (2026). Public per-pack degradation curves are not available for most models. The GM 20-module truck pack (170 kWh: Hummer EV, Silverado EV, Sierra EV) battery warranty runs 8 years / 100,000 miles to a 75% capacity floor, which is the OEM-guaranteed minimum within that period. Individual results vary with climate, charging habits, and DC fast-charging frequency.
Which vehicles use the GM 20-module truck pack (170 kWh: Hummer EV, Silverado EV, Sierra EV)?
GMC Hummer EV 2022-2025 (SUV (2024 on), Pickup 2X, and standard on the Pickup 3X. The Edition 1 Pickup uses the 24-module pack); Chevrolet Silverado 1500 2024-2025 (Silverado EV only: 2024 WT 3WT and the Extended Range pack for 2025. GM does not publish module counts by range name; the match to this pack comes from its EPA filings); GMC Sierra 1500 2024-2025 (Sierra EV only: Denali Extended Range for 2025. GM does not publish module counts by range name; the match to this pack comes from its EPA filings); Chevrolet Silverado 1500 2026-2026 (Silverado EV only: Extended Range pack (WT, LT, Trail Boss). GM does not publish module counts by range name; the match to this pack comes from its EPA filings); GMC Sierra 1500 2026-2026 (Sierra EV only: Extended Range pack (Elevation, AT4, Denali). GM does not publish module counts by range name; the match to this pack comes from its EPA filings).