Yes—GMC covers the high‑voltage battery of its electric models under GM’s Electric Propulsion Components warranty for up to 8 years or 100,000 miles, whichever comes first. The 12‑volt auxiliary battery is generally covered under the standard bumper‑to‑bumper warranty, though coverage can vary by model and region, and normal wear or accidental damage is typically not covered.
How GMC warranties batteries
GMC (as part of General Motors) uses a multi‑tier warranty approach that distinguishes between the high‑voltage battery used in EVs and the conventional 12‑volt battery. The specifics can vary by model year and region, so it’s important to check your warranty booklet or the GMC Owner Center for your vehicle.
High‑voltage battery coverage
Under the Electric Propulsion Components warranty, the high‑voltage battery and related propulsion components are protected against defects in materials or workmanship for a typical term of 8 years or 100,000 miles, whichever comes first. This coverage applies to GMC electric models such as the Hummer EV and Sierra EV in markets where these vehicles are sold.
- Coverage applies when a battery failure is due to a manufacturing defect.
- Does not cover normal wear, capacity loss from regular use, or damage from improper charging, accidents, or misuse.
- Terms and exactly which components are included can vary by model year and region; confirm with your dealer.
In practice, this warranty aims to prevent battery failure from leaving owners with substantial repair costs during the warranty period.
12‑volt auxiliary battery coverage
The 12‑volt battery, which powers starting and accessory systems, is generally treated under the standard bumper‑to‑bumper warranty terms. Coverage details can differ by model year and region, and not all failures are guaranteed under warranty.
- Typical bumper‑to‑bumper coverage is 3 years or 36,000 miles, though regional variations exist.
- Coverage usually applies if the failure is due to a defect in materials or workmanship.
- Normal wear, improper maintenance, and damage from accidents or misuse are typically excluded.
Owners should verify their specific terms with a GMC dealer or in the warranty documentation for their vehicle.
What to do if you think you have a covered battery issue
If you suspect a defect that might be covered, contact your GMC dealer or GM Roadside Assistance to arrange an inspection under warranty. Have your VIN and maintenance records ready to determine coverage quickly.
How to verify coverage for your GMC
To confirm coverage, you can:
- Review the warranty booklet that came with your vehicle.
- Log into the GMC Owner Center to check warranty status by VIN.
- Ask your GMC dealer to run a warranty eligibility check using the VIN.
Dealership staff can guide you through whether a replacement battery is covered and what costs would apply if not.
Summary: GMC’s warranty structure generally protects the high‑voltage battery of its electric models for up to 8 years/100,000 miles under the Electric Propulsion Components warranty, while the 12‑volt battery follows the standard bumper‑to‑bumper terms. Always verify model‑year specifics with your dealer or the official warranty documentation.