🔧 Altima - Starter Motor Replacement

The starter motor is the electric motor that cranks your engine when you turn the key/push the button. On your Altima, replacing it involves disconnecting the battery, removing access covers, unbolting the starter from the transmission bellhousing, and swapping it with a new unit.

Difficulty Level: Intermediate | Estimated Time: 1.5-3 hours

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⚠️ Safety & Precautions

• ⚠️ Disconnect the battery negative terminal before touching the starter wiring (the main cable is always “hot”).
• ⚠️ Support the car with jack stands on solid ground; never rely on a floor jack alone.
• ⚠️ Let the exhaust cool fully if the car was recently driven.
• ⚠️ Keep the key fob away from the car so it can’t crank unexpectedly.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• Wheel chocks
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" ratchet
• 3/8" torque wrench (10-100 ft-lbs range)
• 6" socket extension
• 12" socket extension
• Universal joint socket adapter
• Flat-blade screwdriver
• Trim clip removal tool
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Starter motor - Qty: 1
• Starter electrical terminal nut kit - Qty: 1

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📋 Before You Begin

• 🅿️ Park on level ground, turn the ignition OFF, and set the parking brake.
• 🧱 Chock the rear wheels with wheel chocks.
• 🔋 Open the hood and plan to disconnect the battery negative terminal first.
• 🧰 Lay out your extensions and universal joint adapter; access is tight.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the battery

• Use a 10mm socket to loosen and remove the negative battery terminal clamp.
• Move the cable aside so it can’t spring back onto the post.
• This prevents accidental short circuits.

Step 2: Raise the front of the car and remove the lower cover

• Use a floor jack (rated 3-ton minimum) at the front center jacking point and set the car onto jack stands (rated 3-ton minimum).
• Use a trim clip removal tool and 10mm socket (fasteners vary by cover) to remove the engine under cover/splash shield.
• Use a flashlight to locate the starter at the transmission bellhousing area.

Step 3: Remove the intake ducting (for working room)

• From the engine bay, use a flat-blade screwdriver to loosen the air duct clamps.
• Remove the intake duct/resonator pieces as needed to improve access from above.
• More space now saves time later.

Step 4: Disconnect the starter wiring

• At the starter, pull off the small signal-wire connector by hand (wiggle gently; don’t yank the wires).
• Use a 12mm socket to remove the nut on the main battery cable terminal (B+ terminal) and remove the cable.
• Position the cable aside so it cannot touch metal.
• When reinstalling the B+ terminal nut: Torque to 10 N·m (89 in-lbs).

Step 5: Remove the starter mounting bolts

• Support the starter with one hand.
• Use a 14mm socket, 12" socket extension, and universal joint socket adapter to remove the two starter mounting bolts.
• Pull the starter straight out of the bellhousing.

Step 6: Install the new starter

• Compare the old and new starter (mounting ears, electrical studs, and connector location).
• Slide the starter into place, aligning it with the bellhousing.
• Start both mounting bolts by hand first to avoid cross-threading.
• Tighten using a 14mm socket, then finalize with a 3/8" torque wrench (10-100 ft-lbs range): Torque to 49 N·m (36 ft-lbs).

Step 7: Reconnect the starter wiring

• Install the main battery cable onto the starter B+ stud.
• Use a 12mm socket to tighten the B+ terminal nut: Torque to 10 N·m (89 in-lbs).
• Reconnect the small signal-wire connector until it clicks/fully seats.

Step 8: Reinstall the intake ducting and lower cover

• Reinstall the intake ducting and tighten clamps using a flat-blade screwdriver.
• Reinstall the under cover using a trim clip removal tool and 10mm socket.

Step 9: Reconnect the battery and lower the car

• Reinstall the negative battery terminal using a 10mm socket: Torque to 5 N·m (44 in-lbs).
• Remove the jack stands and lower the car using the floor jack (rated 3-ton minimum).

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✅ After Repair

• ✅ Start the engine and confirm it cranks strongly without clicking or grinding.
• ✅ Check that no warning lights appear and that the engine idles normally.
• ✅ Recheck the starter wiring area for any loose cables or rubbing/clearance issues.
• ✅ If the battery was weak, consider having it load-tested (a weak battery can mimic starter issues).

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💰 DIY vs Shop Cost

Shop Cost: $450-$850 (parts + labor)

DIY Cost: $180-$420 (parts only)

You Save: $270-$430 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3 hours.

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🎯 Ready to get started?

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