2017 GMC Sierra 2500HD Battery Size & Group

Quick Answer

• BCI Group Size: Group 48 (H6) for gasoline engines, Group 31 (dual batteries) for diesel engines.
• CCA Rating: 730-800 CCA for gasoline, 900-1000 CCA per battery for diesel.
• Reserve Capacity: 130-160 minutes for gasoline, 180-220 minutes per battery for diesel.
• AGM vs. Flooded: Both gasoline and diesel models can use either AGM or flooded batteries. AGM offers superior performance and longevity.
• Terminal Layout: Top post, typically positioned on the front side of the battery (short side).
• Physical Dimensions:
  • Group 48 (H6): Approximately 10.9" L x 6.9" W x 7.6" H
  • Group 31: Approximately 13.0" L x 6.8" W x 9.4" H
• Dual-Battery Setup: Yes, diesel models utilize a dual-battery setup, wired in parallel.

Replacement Battery Options

• Interstate:
  • Gasoline (Group 48/H6): MTP-48/H6 (flooded), MTX-48/H6 (AGM)
  • Diesel (Group 31): MT-31S (flooded), MTZ-31S (AGM)
• Optima:
  • Gasoline (Group 48/H6): DH6 YellowTop (AGM)
  • Diesel (Group 31): No direct Group 31 equivalent; consider custom fitment of two YellowTop Group 34/78 if space allows, or use other brands for Group 31.
• DieHard:
  • Gasoline (Group 48/H6): Platinum AGM H6, Gold H6 (flooded)
  • Diesel (Group 31): Platinum AGM Group 31, Gold Group 31 (flooded)
• Odyssey:
  • Gasoline (Group 48/H6): ODP-AGM48 H6 (AGM)
  • Diesel (Group 31): 31-PC2150S (AGM)
• ACDelco:
  • Gasoline (Group 48/H6): 48AGM (AGM), 48-PS (flooded)
  • Diesel (Group 31): 31AGM (AGM), 31H (flooded)

(Note: Part numbers can vary by retailer and may be superseded. Always verify with your supplier.)

AGM vs. Flooded — Which Does This Vehicle Need?

For your 2017 GMC Sierra 2500HD, whether it has a gasoline or diesel engine, you can use either an Absorbed Glass Mat (AGM) battery or a traditional flooded (lead-acid) battery. However, there are significant advantages to choosing an AGM battery, especially for a heavy-duty truck.

AGM batteries are sealed, maintenance-free, and more resistant to vibration and extreme temperatures than flooded batteries. They also offer a higher reserve capacity and a longer lifespan, making them an excellent choice for vehicles that demand reliable power, such as diesel trucks with high cranking requirements or those with numerous electronic accessories. While AGM batteries typically have a higher upfront cost, their extended life and enhanced performance often justify the investment in the long run.

Flooded batteries are a more economical option and will certainly function correctly if maintained properly. If you opt for a flooded battery, ensure you periodically check the electrolyte levels and top up with distilled water if necessary.

Post-Installation Relearn / Reset Procedure

After replacing the battery in your 2017 GMC Sierra 2500HD, it's good practice to perform a simple reset to ensure all vehicle systems return to normal operation. While many modern GM vehicles have intelligent power management systems that adapt over time, a manual reset can sometimes expedite the process or resolve minor lingering issues.

1. Engine Off, Key Out: Ensure the vehicle is completely off and the key is removed from the ignition.
2. Disconnect Negative Terminal: Disconnect the negative (black) battery terminal first.
3. Disconnect Positive Terminal: Disconnect the positive (red) battery terminal.
4. Connect New Battery: Connect the positive terminal first, then the negative terminal.
5. Start Vehicle: Start the truck and let it idle for 5-10 minutes. This allows the engine control module (ECM) to relearn idle parameters.
6. Drive Cycle: Drive the vehicle under various conditions for a few miles (city and highway). This helps various other modules recalibrate, such as the transmission control module (TCM) and the stability control system.

Keep in mind that some features, like radio presets, navigation settings, and power window one-touch up/down functions, may need to be reset manually. Refer to your owner's manual for specific instructions on resetting individual features if needed.

Signs of a Failing Battery

Recognizing the signs of a failing battery can save you from being stranded. Here are the most common indicators:

• Slow Engine Crank: The engine turns over sluggishly, taking longer than usual to start.
• Dim Headlights/Interior Lights: Lights appear dimmer when the engine is not running, but brighten when the engine is on.
• Warning Lights: A battery warning light or check engine light may illuminate on your dashboard.
• Corrosion on Terminals: Excessive corrosion around the battery terminals can impede current flow.
• Swollen Battery Case: A bulging or swollen battery case indicates internal damage and is a sign of a severely compromised battery.
• Foul Odor: A "rotten egg" smell near the battery can indicate a leaking or overcharging battery.
• Intermittent Electrical Issues: Sporadic problems with power windows, radio, or other electrical accessories.

Common Battery Issues for This Generation

For the 2017 GMC Sierra 2500HD, common battery issues often revolve around the demands placed on its electrical system:

• Accessory Drain: Many owners equip their trucks with numerous aftermarket accessories (light bars, winches, stereo systems) that can draw significant power, leading to premature battery wear, especially if the vehicle sits for extended periods.
• Extreme Temperatures: Like all batteries, those in the Sierra 2500HD can suffer reduced performance and lifespan in extremely hot or cold climates. Heat accelerates internal corrosion, while cold dramatically reduces cranking power.
• Infrequent Use: Vehicles that are driven infrequently or primarily for short trips may not allow the alternator enough time to fully recharge the battery, leading to a chronically undercharged state.
• Parasitic Draws: Although less common, a small electrical draw (parasitic draw) from a malfunctioning component can slowly drain the battery over time, leading to a dead battery after the vehicle sits for a few days.

Regular battery testing, especially as the battery ages, is the best preventative measure to avoid an unexpected breakdown.

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