2016 GMC Sierra 2500HD Battery Size & Group

Quick Answer

• BCI Group Size: Group 65 (Gasoline), Group 31 (Diesel)
• CCA Rating: 720 CCA minimum (Gasoline), 800 CCA minimum per battery (Diesel)
• Reserve Capacity: 130 minutes minimum (Gasoline), 160 minutes minimum per battery (Diesel)
• AGM vs. Flooded: Flooded is standard, but AGM is a recommended upgrade for enhanced durability and performance.
• Terminal Layout: Top post, typically SAE (standard automotive).
• Physical Dimensions:
  • Group 65 (Gasoline): Approximately 12" L x 7.5" W x 7.5" H
  • Group 31 (Diesel): Approximately 13" L x 6.81" W x 9.44" H
• Dual-Battery Setup: Yes, 2016 GMC Sierra 2500HD diesel models utilize a dual-battery setup.

Replacement Battery Options

When it's time for a new battery, consider these popular and reliable options:

• Interstate:
  • Gasoline (Group 65): MTP-65 (Flooded), MTZ-65 (AGM)
  • Diesel (Group 31): Workaholic Group 31P-HD (Flooded), AGM Group 31 (AGM)
• Optima:
  • Gasoline (Group 65, though may require slight modification/adapter for optimal fit): YellowTop D31A (often used as an upgrade, may not be a direct fit for all Group 65 trays)
  • Diesel (Group 31): YellowTop D31T
• DieHard:
  • Gasoline (Group 65): DieHard Platinum AGM Group 65
  • Diesel (Group 31): DieHard Platinum AGM Group 31
• Odyssey:
  • Gasoline (Group 65): 65-PC1750 (Extreme Series AGM)
  • Diesel (Group 31): 31-PC2150 (Extreme Series AGM)
• ACDelco: (Often OE supplier)
  • Gasoline (Group 65): ACDelco Gold 65AGM (AGM) or Professional 65-7YR (Flooded)
  • Diesel (Group 31): ACDelco Gold 31AGM (AGM) or Professional 31PG (Flooded)

Note: Always verify the exact part number with your retailer and vehicle specifications.

AGM vs. Flooded — Which Does This Vehicle Need?

The 2016 GMC Sierra 2500HD, whether gasoline or diesel, originally came equipped with flooded (lead-acid) batteries from the factory. While flooded batteries are perfectly adequate and often more budget-friendly, upgrading to an Absorbed Glass Mat (AGM) battery is highly recommended, especially for a heavy-duty truck.

AGM batteries offer several advantages:

• Increased Durability: They are more resistant to vibration, which is beneficial for heavy-duty trucks that may encounter rough terrain or tow heavy loads.
• Longer Lifespan: Generally, AGMs tend to last longer than conventional flooded batteries under similar conditions.
• Better Performance: They provide more consistent power delivery, handle deep discharges better, and recharge faster.
• Maintenance-Free: No need to check electrolyte levels, as they are sealed units.
• Improved Cold Weather Starting: Often have better cold-cranking performance.

For diesel models with their higher electrical demands and dual-battery setup, AGM batteries can provide a significant boost in reliability and longevity. While not strictly "needed," an AGM battery is a smart upgrade for any 2016 Sierra 2500HD owner looking for enhanced performance and peace of mind.

Post-Installation Relearn / Reset Procedure

After disconnecting and replacing the battery in your 2016 GMC Sierra 2500HD, it's a good idea to perform a basic relearn or reset procedure. While the truck's sophisticated electronics will generally adapt over time, a manual reset can sometimes expedite the process and prevent minor drivability issues.

Here’s a common procedure:

1. Install New Battery: Ensure the new battery is securely installed and both positive and negative terminals are tightly connected.
2. Key Cycle (Basic Reset): With all accessories off, insert the key and turn it to the "ON" position (without starting the engine) for 30 seconds. Then turn it to "OFF" for 30 seconds. Repeat this cycle 2-3 times.
3. Idle Relearn: Start the engine and let it idle in Park for 10-15 minutes without touching the accelerator. This allows the engine control module (ECM) to re-learn its idle parameters.
4. Drive Cycle: Drive the vehicle normally for a few miles, including some stop-and-go driving and highway speeds. This will allow other modules, like the transmission control module (TCM), to re-learn their operating parameters.

Note: Some minor features like radio presets, clock, and one-touch window functions may need to be reset manually. If you notice any persistent warning lights or unusual behaviors, consult your owner's manual or a certified technician.

Signs of a Failing Battery

Don't wait for your truck to leave you stranded. Be aware of these common signs that your 2016 GMC Sierra 2500HD's battery might be on its way out:

• Slow Engine Crank: The most obvious sign. The engine turns over sluggishly, taking longer than usual to start.
• Dim Headlights or Interior Lights: Especially noticeable when the engine is off or cranking.
• Warning Lights: A battery or charging system warning light on your dashboard.
• Corrosion on Terminals: White or bluish, powdery substance around the battery terminals can indicate a poor connection or internal battery issues.
• Swelling or Bloating Battery Case: A severely overcharged or failing battery can swell, a dangerous sign.
• Age of Battery: Most automotive batteries last 3-5 years. If yours is older, it's worth testing.
• Electronic Issues: Erratic electrical components like power windows, radio, or dashboard displays acting strangely.

Common Battery Issues for This Generation

While the 2016 GMC Sierra 2500HD is a robust truck, certain factors can contribute to battery issues, especially in this generation:

• High Electrical Demand: Modern heavy-duty trucks are packed with electronics, accessories, and demanding starting systems (especially diesels). This places a significant load on the battery and charging system.
• Parasitic Draws: Aftermarket accessories (remote start, upgraded audio, heavy-duty lighting) or even faulty factory modules can create a small electrical drain that slowly kills a battery, particularly during long periods of inactivity.
• Extreme Temperatures: Both extreme heat and cold can degrade battery life. Hot climates can lead to faster evaporation of electrolyte, while cold weather significantly reduces battery capacity and increases starting demands.
• Short Drives: Frequent short trips don't allow the alternator enough time to fully recharge the battery, leading to a chronically undercharged state.
• Corrosion: Trucks exposed to harsh environments (salt, dirt, vibrations) can develop battery terminal corrosion faster, impeding current flow.

Understanding these factors can help you prolong your battery's life and identify issues early.

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