2023 GMC Yukon Battery Size & Replacement Guide

As an ASE-certified master technician, I’ve seen my fair share of late-model full-size SUVs roll into the bay with complex electrical demands. The 2023 GMC Yukon is a prime example. Packed with advanced safety features, a massive infotainment display, and an Auto Start/Stop system, this SUV relies heavily on its 12-volt battery. Whether you have the 5.3L V8, the 6.2L V8, or the 3.0L Duramax turbo-diesel, installing the correct battery is critical for keeping your Yukon on the road.

Quick answer

• BCI Group Size: Group H7 (also known as 94R). Note: Some heavy-duty applications or specific diesel configurations may accommodate an H8 (Group 49), but H7 is the standard factory fitment.
• Cold Cranking Amps (CCA): 800 to 850 CCA (OEM specification is typically 800 CCA).
• Reserve Capacity (RC): 140 minutes.
• AGM vs. Flooded: AGM (Absorbent Glass Mat) is required. Do not use a standard flooded lead-acid battery.
• Terminal Layout: Standard SAE Top Post, Right Positive (when viewing from the front of the battery).
• Physical Dimensions (H7/94R): 12.4" Length x 6.9" Width x 7.5" Height.
• Diesel Setup: The 3.0L Duramax I6 typically uses a single, high-capacity H7 or H8 AGM battery rather than a traditional dual-battery setup found in heavy-duty 2500/3500 diesel trucks.

Replacement battery options

When replacing the battery in your 2023 GMC Yukon, it pays to stick with top-tier brands that manufacture robust AGM batteries. Here are some of the most popular, reliable replacement options:

• ACDelco Gold AGM: Part # 94RAGM (This is the direct OEM replacement and highly recommended for preserving factory electrical performance).
• DieHard Platinum AGM: Group Size H7/94R (A widely available, highly durable option with excellent warranty coverage).
• Interstate MTZ / MTX Series: Part # MTZ-94R or MTX-94R (Known for superior deep-cycle capabilities and vibration resistance).
• Odyssey Performance Series: Part # ODP-AGM94R H7 (Premium pricing, but offers incredible reserve capacity and longevity).
• Optima: Optima's YellowTop DH7 is a great fit for the Yukon, designed specifically for high electrical loads and modern Auto Start/Stop systems.

AGM vs flooded — which does this vehicle need?

The 2023 GMC Yukon strictly requires an AGM (Absorbent Glass Mat) battery.

Why? General Motors equips this generation of the Yukon with an Auto Start/Stop system to improve fuel economy. This system shuts the engine off at stoplights while the battery continues to power the HVAC, infotainment, lighting, and safety modules. When you take your foot off the brake, the battery must instantly crank the engine back to life. Standard flooded batteries cannot handle this constant deep-cycling and will fail prematurely—often within a few months. Additionally, the Yukon's Battery Management System (BMS) is calibrated specifically for the charge rates of an AGM battery.

Post-installation relearn / reset procedure

Modern GMs like the 2023 Yukon utilize a Battery Sensor Module (attached to the negative battery cable) and a sophisticated Battery Management System (BMS). When you install a new battery, the BMS still "remembers" the degraded state of the old battery and may undercharge the new one.

To reset the BMS:

1. Scan Tool Method (Preferred): Connect an advanced OBD2 bidirectional scan tool. Navigate to the Body Control Module (BCM) -> Module Setup -> Battery Sensor Module Learn (or Battery Replace). Follow the on-screen prompts to reset the battery age and learned resistance to zero.
2. Manual/Self-Learn Method: If you don't have a scan tool, GM vehicles can often self-learn the new battery state of charge. After installing the new battery, roll up all windows, turn off all accessories, and lock the doors. Let the vehicle sit completely undisturbed (do not open the doors or wake the modules) for at least 4 to 8 hours (overnight is best). The BMS will take a new resting voltage reading and recalibrate.

Signs of a failing battery

If you aren't sure if your Yukon needs a new battery yet, watch out for these telltale signs:

• Auto Start/Stop stops working: The computer will disable this feature to conserve power if battery voltage drops below a certain threshold.
• Slow engine cranking: A noticeably sluggish start, especially on chilly mornings.
• Electrical gremlins: Flickering infotainment screens, power running boards moving slowly, or random "Service StabiliTrak" or "Service Driver Assist" messages appearing and disappearing.
• Check Engine or Battery Light: A red battery icon on the dash indicates a charging system issue, which could be the battery, alternator, or a blown mega-fuse.

Common battery issues for this generation

While the 2023 GMC Yukon is relatively new, the underlying T1XX platform has been around since 2021. The most common battery-related issue we see as technicians is parasitic draw caused by Over-The-Air (OTA) software updates hanging up, or infotainment systems failing to enter "sleep" mode after the vehicle is turned off. If your battery dies repeatedly even after replacement, have a technician perform a parasitic draw test to ensure all modules are properly powering down.

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