2021 GMC Yukon Battery Size & Group
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Quick answer
- BCI Group Size: H7/94R
- CCA Rating: 800 CCA or higher
- Reserve Capacity: 140-160 minutes (approximately)
- AGM vs. Flooded: AGM required for all trims
- Terminal Layout: Top post, typically DIN (recessed below the battery top for flush fit)
- Physical Dimensions (H7/94R): 12.4 inches (L) x 6.9 inches (W) x 7.5 inches (H) (approximate)
- Dual-Battery Setup: Not applicable (not a diesel model)
Replacement Battery Options
While specific part numbers can vary by retailer and manufacturing updates, here are popular options for the 2021 GMC Yukon, which requires an H7/94R AGM battery:
- Interstate: MTX-94R/H7 (or similar, check current Interstate catalog)
- Optima: Optima H7 YellowTop AGM (specific part number may vary, verify with Optima)
- DieHard: Platinum AGM H7 Group 94R (or similar, check current DieHard catalog)
- Odyssey: Odyssey Extreme Series ODP-AGM94R H7 (or similar, verify with Odyssey)
- ACDelco: ACDelco Gold 94RAGM (or similar, designed as an OEM replacement)
AGM vs. Flooded — Which Does This Vehicle Need?
The 2021 GMC Yukon requires an AGM (Absorbent Glass Mat) battery. General Motors, like many modern manufacturers, designs its electrical systems around the specific characteristics of AGM batteries. Attempting to use a traditional flooded lead-acid battery in the 2021 Yukon can lead to several problems:
- Reduced Lifespan: Flooded batteries are not designed for the demanding charge/discharge cycles of modern vehicles with extensive electronics, start/stop technology (if equipped), and smart charging systems. An AGM battery can handle these cycles much more efficiently.
- Improper Charging: The vehicle's advanced charging system is calibrated for AGM batteries. Using a flooded battery may result in improper charging, leading to premature battery failure or even damage to the vehicle's electrical components.
- Performance Issues: The BCM (Body Control Module) and other modules rely on consistent voltage and current supply, which an AGM battery provides more reliably throughout its lifespan.
- Warranty Void: In some cases, using an incorrect battery type could potentially void portions of your vehicle's electrical system warranty.
Always replace your 2021 GMC Yukon's battery with an AGM type of the correct BCI group size (H7/94R).
Post-Installation Relearn / Reset Procedure
After replacing the battery in your 2021 GMC Yukon, you may experience some minor electrical anomalies or have service messages appear. This is normal, as the vehicle's various control modules may need to
More specs for the 2021 GMC Yukon
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2021 GMC Yukon Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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