The 2016 Buick LaCrosse uses a standard 12-volt lead-acid battery and can be replaced by swapping in a new unit, following safety steps and resetting the vehicle electronics afterward.
Safety and preparation
Battery replacement involves handling corrosive acid and heavy components. Protect yourself with safety glasses and gloves, work on a flat surface with the vehicle off, and ensure the parking brake is set before starting. Keep metal tools away from the battery terminals to avoid short circuits or electric shock.
Tools and parts you’ll need
The following tools and parts cover the basics for removing the old battery and installing a new one. Having the right items helps ensure a safe and proper swap.
- New 12-volt automotive battery of the correct size for the LaCrosse
- Battery terminal protection (antioxidant paste or spray)
- Wrench set or socket set (likely 10 mm for terminals, plus any sizes needed for the hold-down bolts)
- Battery hold-down clamp or mounting hardware (if not included with the new battery)
- Wire brush or baking soda solution for cleaning corrosion
- Rags or shop towels
- Safety glasses and gloves
- Memory saver (optional, recommended if you want to preserve ECU/radio memory)
Note: The exact battery group size and terminal layout can vary by vehicle configuration. Check the label on your current battery or the owner's manual to select the correct replacement.
Locating the battery in a 2016 Buick LaCrosse
In most LaCrosse models, the 12-volt battery is located in the engine bay, typically on the passenger side near the shock tower. If you cannot locate it easily, consult the owner’s manual under Battery or Electrical System, or look for a heavy rectangular box with two terminals and a hold-down clamp.
Removing the old battery
Follow these steps to safely remove the old battery. If the battery is in a different location in your car, the principle remains the same—disconnect, unclamp, and lift carefully.
- Park on level ground, turn off the ignition, and engage the parking brake.
- Open the hood and locate the battery; inspect for signs of corrosion around the terminals.
- Disconnect the negative (-) battery cable first using a wrench (usually 10 mm). Loosen the clamp and detach the cable from the terminal; set aside safely.
- Disconnect the positive (+) battery cable next.
- Remove the hold-down bracket or battery tray clamp securing the battery in place.
- Carefully lift the old battery straight out of the tray. Batteries are heavy; use proper lifting technique to avoid injury.
- Inspect the battery tray and surrounding area for corrosion or damage; clean as needed with a baking soda solution or terminal cleaner.
With the old battery removed, you’re ready to install the new one. Ensure the new battery is oriented the same way as the old one, with terminals in the same positions.
Installing the new battery
Place the new battery into the tray, secure it with the hold-down clamp, and reconnect the terminals in the correct order.
- Install the battery tray and hold-down clamp, tightening to the manufacturer’s specification or snug enough to prevent movement without over-tightening.
- Reconnect the positive terminal first. Clamp the terminal and tighten until snug to ensure a solid connection.
- Reconnect the negative terminal last. Tighten securely, ensuring a clean contact and no looseness.
- If you used corrosion protection, reapply as needed.
After the battery is connected, you may need to reset certain vehicle electronics. A brief drive can help the engine control module relearn idle and fuel trims. If you used a memory saver, you can remove it now.
Post-installation checks and electronics reset
Turn on the ignition and check for warning lights. You may need to reset the clock, radio presets, or garage door opener codes if the battery was disconnected for an extended period. Some vehicles may require re-pairing of a key fob or other security-related settings; refer to the owner’s manual for specific steps if needed.
Relearning and codes
Most GM vehicles don’t require dealer reprogramming after a battery swap, but certain systems—such as the radio, anti-theft immobilizer, or memory functions—may need a quick re-learn. If a memory saver was not used, expect a short drive to reestablish normal operation.
Tips and maintenance
Keep terminals clean and dry, check for corrosion regularly, and ensure the hold-down remains secure. Replace the battery every 3–5 years or as symptoms (slow cranking, dim lights, or electrical glitches) indicate. Dispose of the old battery at an appropriate recycling facility.
Summary
Replacing the battery in a 2016 Buick LaCrosse is a manageable DIY task. Locate the battery, safely disconnect the old terminals in the correct order, remove and replace the battery with a properly sized new unit, reconnect the terminals in the proper order, and verify that electrical systems function correctly afterwards. Always consult the owner's manual for exact specifications and follow safety practices during the swap. Consider using a memory saver to protect electronics during the process and to simplify reprogramming if needed.