GMC Sierra EV charging port and charge rate
The 2026 GMC Sierra EV uses a CCS1 charging port (a NACS adapter is offered by GMC), and GarageDex could not confirm a published onboard AC kW figure for this year and up to 350 kW at a DC fast charger.
Key takeaways
- 2026 GMC Sierra EV: CCS1 port.
- Onboard AC Level 2 rate not published by the source.
- Peak DC fast charge: up to 350 kW.
- NACS adapter: NACS adapter available from OEM.
| Years | Port | AC (Level 2) | DC fast charge | Battery | NACS adapter |
|---|---|---|---|---|---|
| 2026 | CCS1 | n/a | 350 kW | n/a | NACS adapter available from OEM |
NACS adapter and Tesla Superchargers for the GMC Sierra EV
The 2026 GMC Sierra EV has a CCS1 port. At a Tesla Supercharger it needs a NACS DC adapter, and Tesla only allows the one from GMC or Tesla.
Tesla's rule: “Supercharging is only accessible for NACS-equipped vehicles and CCS1-equipped vehicles with an NACS DC adapter provided by Tesla or your vehicle’s manufacturer. For safety reasons, using third-party adapters is prohibited.” Tesla Support
- Tesla Supercharger access
- “After you purchase the NACS DC adapter, you can find, start and pay for charging sessions at certain Tesla Superchargers using the myChevrolet mobile app.” Chevrolet Support: How to charge on the Tesla Supercharger Network
- Official adapter
- “The NACS DC Adapter MSRP is $225.” Chevrolet Support: How to charge on the Tesla Supercharger Network
- Built-in NACS port
- “Cadillac Optiq: Cadillac's smallest electric SUV has already made the switch to native NACS charging for 2026.” “GM announced that it expects all 2027 model year EVs from Cadillac, Chevrolet, and GMC to come standard with an NACS port.” GM News: Every GM electric vehicle with NACS charging (2026-08-13)
- Other adapters
- “GM highly discourages use of any third-party adapters. Damage to vehicle components resulting from the installation or use of non-GM approved parts is not covered under the terms of the vehicle warranty and may affect remaining warranty coverage for affected parts.” Chevrolet Support: How to charge on the Tesla Supercharger Network
Which Level 2 charger do you need?
A home Level 2 charger is sold by its amperage (32A, 40A, 48A...), but your car only ever charges at the lower of two numbers: the charger's rated output and your car's own onboard AC charger limit. Installing a 48A/11.5 kW charger on a car with a 7.7 kW onboard charger does not speed anything up - the car simply will not draw more than it can accept. On any DC fast charger, the same idea applies to the whole session: charging is fastest at a low state of charge and tapers hard above roughly 80%, which is why route-charging stops are usually planned to 80%, not 100% (per the U.S. Department of Transportation's EV charging speeds guide). Match a home charger's amperage to your car's onboard AC rating from the table above, with a little headroom for future EVs in the household, rather than buying the biggest unit available.
Charging gear for the GMC Sierra EV
Match the plug to the CCS1 port above - a J1772/CCS1 Level 2 charger for home, plus an adapter only if the table says you need one.
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Other GMC models
Source: GMC News - 2026 GMC Sierra EV adds AT4 and Elevation trims. Charging hardware and NACS-adapter bundling change often; confirm the port and adapter status on your build sheet or with the dealer before you buy hardware.