🔧 Battery - Replacement

On your Sierra, the battery is under the hood on the passenger side. You’ll remove the hold-down, disconnect the cables in the correct order, swap the battery, and then reconnect everything securely. This is a straightforward job, but battery terminals are easy to damage if the wrench slips.

Difficulty Level: Beginner | Estimated Time: 0.5-1 hour

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⚠️ Safety & Precautions

• Wear safety glasses and gloves. Battery acid can burn skin and eyes.
• Turn the ignition off and remove the key/fob from the vehicle.
• Do not let a wrench touch both battery terminals or a terminal and body metal at the same time.
• Disconnect the negative cable first, then the positive cable.
• Reconnect the positive cable first, then the negative cable.
• The battery is heavy. Lift with both hands and keep it level.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm wrench
• 13mm socket
• 3/8-inch ratchet
• Battery terminal brush
• Trim tool
• Battery strap or lift handle
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V battery - Qty: 1
• Battery terminal protector spray - Qty: 1
• Battery hold-down hardware - Qty: 1 set

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the hood and make sure the engine is fully off and cool.
• If your Sierra has memory settings you want to keep, save them before disconnecting the battery.
• Work slowly around the terminals.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the battery

• Open the hood and locate the battery on the passenger side of the engine bay.
• Remove any plastic cover or air intake piece that blocks access, if equipped. Use a trim tool for clips.

Step 2: Disconnect the negative cable

• Use a 10mm wrench to loosen the negative terminal clamp.
• Lift the negative cable off the battery post and move it aside so it cannot spring back.
• Negative comes off first.

Step 3: Disconnect the positive cable

• Use a 10mm wrench to loosen the positive terminal clamp.
• Remove the positive cable and keep it clear of metal parts.

Step 4: Remove the battery hold-down

• Use a 13mm socket and 3/8-inch ratchet to remove the battery hold-down bolt or bracket.
• Lift out the hold-down hardware and set it aside.
• Torque to 18 Nm (13 ft-lbs) on reassembly.

Step 5: Remove the old battery

• Use a battery strap or lift handle to lift the battery straight up and out.
• Keep the battery upright to avoid spilling acid.

Step 6: Clean the tray and terminals

• Use a battery terminal brush to clean corrosion from the cable ends and battery tray area.
• Wipe the tray clean before installing the new battery.
• Clean contact means better starting.

Step 7: Install the new battery

• Lower the new battery into the tray in the same orientation as the old one.
• Make sure the terminals line up with the cables correctly.

Step 8: Reinstall the hold-down

• Reinstall the hold-down bracket using the 13mm socket and 3/8-inch ratchet.
• Make sure the battery cannot move by hand.
• Torque to 18 Nm (13 ft-lbs).

Step 9: Reconnect the positive cable

• Use a 10mm wrench to tighten the positive terminal clamp onto the battery post.
• Make sure it is snug and fully seated.

Step 10: Reconnect the negative cable

• Use a 10mm wrench to tighten the negative terminal clamp onto the battery post.
• Install any battery cover or intake piece you removed earlier.
• Torque terminal clamps to 5 Nm (44 in-lbs).

Step 11: Check the installation

• Close the hood and start the engine.
• Check for normal cranking, dash lights, and warning messages.

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✅ After Repair

• Reset the clock and any saved radio presets if needed.
• Check that the battery is secure and the terminals do not move.
• Drive the vehicle and confirm there are no electrical warning lights.

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $140-$240 (parts only)

You Save: $110-$210 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1 hour.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.