2014 GMC Sierra 1500: Battery Size & Group

Quick answer

• BCI Group Size: H6 / 48
• Cold Cranking Amps (CCA): 615-730 CCA
• Reserve Capacity: ~120-140 minutes
• AGM vs flooded requirement: AGM is highly recommended
• Terminal Layout: Top Post
• Physical Dimensions: 10.9 x 6.9 x 7.5 inches (L x W x H)
• Dual-battery setup: N/A

Replacement battery options

• Interstate: MTX-48/H6
• Optima: DH6 YellowTop
• DieHard: Platinum AGM H6
• Odyssey: ODP-AGM48 H6 L3
• ACDelco: 48AGM

AGM vs flooded — which does this vehicle need?

The 2014 GMC Sierra 1500 can use either an Absorbent Glass Mat (AGM) or a traditional flooded lead-acid battery. However, an AGM battery is highly recommended, and your truck likely came with one from the factory. The electrical systems on this generation of Sierra are more demanding than on older trucks. Features like the large infotainment screen, numerous computer modules, and start-stop technology (on later models) all put a significant strain on the battery. AGM batteries are much better suited to the frequent deep cycling that these systems can cause. They also offer better vibration resistance and are completely sealed, preventing acid leaks.

Post-installation relearn / reset procedure

After replacing the battery in your 2014 GMC Sierra 1500, a relearn procedure is recommended to ensure the charging system operates correctly. The truck's computer monitors the battery's state of charge and health over time. When you install a new battery, the computer needs to be reset to adapt to the new battery's characteristics. If you don't perform the relearn, the charging system may overcharge or undercharge the new battery, leading to a shorter lifespan.

Here’s a general procedure that often works:

1. Turn the ignition to the "On" position (without starting the engine).
2. Leave the ignition on for 10-15 minutes. This allows the various modules in the truck to recalibrate.
3. Turn the ignition off.
4. Start the engine. The battery light should be off, and the charging system should now be operating normally.

If that doesn't work, you may need a scan tool to perform a formal battery registration/relearn procedure.

Signs of a failing battery

• Slow engine crank: The engine turns over sluggishly when you try to start it.
• Dimming lights: The headlights and interior lights dim when you start the engine or when the truck is idling.
• Warning lights: The battery light or "Check Engine" light may illuminate.
• Swollen or leaking battery case: If the battery case is bulging or you see signs of corrosion around the terminals, it's time for a new battery.
• Age: Most car batteries last 3-5 years. If your battery is older than that, it's a good idea to have it tested.

Common battery issues for this generation

The 2014 GMC Sierra 1500 is known for a few battery-related issues. One of the most common is a parasitic draw, where something in the electrical system continues to draw power even when the truck is turned off. This can be caused by a faulty module, a bad relay, or even something as simple as a glove box light that stays on. If your battery keeps dying even after you've replaced it, a parasitic draw is a likely culprit.

Another known issue is related to the battery cables. The factory battery cables can sometimes corrode or loosen over time, leading to a poor connection and a no-start condition. If you're having battery problems, it's always a good idea to check the condition of your battery cables.

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