🔧 Altima - Starter Motor Replacement

The starter motor cranks your Altima’s engine when you turn the key. Replacement involves disconnecting the battery, removing the electrical connections on the starter, then unbolting and swapping the starter at the transmission bellhousing.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• ⚠️ Disconnect the negative battery cable before touching the starter wiring (the main cable is always “live” and can short to ground).
• ⚠️ Support the car on jack stands at the pinch welds/approved lift points; never work under a car supported only by a jack.
• ⚠️ Let the engine/exhaust cool first; the starter sits near hot components.
• ⚠️ Keep the key fob away from the car while working so the vehicle can’t be accidentally cranked.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Safety glasses
• Mechanic gloves
• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" drive ratchet
• 6" socket extension
• 12" socket extension
• Torque wrench (10-80 ft-lbs range)
• Flat trim clip tool
• Needle-nose pliers
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

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

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📋 Before You Begin

• 🧰 Park on level ground, set the parking brake, and chock the rear wheels.
• 🧰 Open the hood and make sure the ignition is OFF.
• 🧰 Plan your access: on your Altima the starter is easiest from underneath after removing the lower splash shield (the plastic panel under the engine).

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the battery

• Use a 10mm socket and 3/8" drive ratchet to loosen the negative (-) battery terminal clamp and remove it from the battery post.
• Move the cable aside so it can’t spring back onto the post. Think: “negative off first.”

Step 2: Raise and support the vehicle

• Use a floor jack (rated 2-ton minimum) to lift the front of the car at the approved front jacking point.
• Set the car down onto jack stands (rated 2-ton minimum).
• Shake the car lightly to confirm it’s stable before going underneath.

Step 3: Remove the lower splash shield

• Use a 10mm socket for any small bolts and a flat trim clip tool for plastic clips.
• Lower and remove the splash shield to expose the engine/transmission area.

Step 4: Locate the starter and remove the electrical connections

• Use a flashlight to find the starter at the transmission bellhousing area.
• Remove the small starter signal connector:
  • Depress the tab and pull it off by hand; use needle-nose pliers only if needed (don’t crush the connector).
• Remove the main battery cable on the starter “B+” stud:
  • Pull off the rubber boot by hand.
  • Use a 12mm socket and 3/8" drive ratchet to remove the nut, then lift the cable eyelet off the stud.
  • Reinstall later and Torque to 9.8 Nm (87 in-lbs).

Step 5: Remove the starter mounting bolts

• Support the starter with one hand as you loosen the bolts so it doesn’t drop.
• Use a 14mm socket, 3/8" drive ratchet, and a 6" socket extension (or 12" socket extension if needed) to remove the starter mounting bolts.
• Set the bolts aside for reuse unless your replacement includes new bolts.

Step 6: Remove the starter

• Wiggle the starter free from the bellhousing and lower it out carefully.
• Compare the old and new starter: same mounting ears, same electrical studs/connector, same nose length.

Step 7: Install the new starter

• Position the new starter into the bellhousing and start the mounting bolts by hand to avoid cross-threading.
• Use a 14mm socket and 3/8" drive ratchet to snug the bolts.
• Use a torque wrench (10-80 ft-lbs range) and 14mm socket to finish tightening: Torque to 49 Nm (36 ft-lbs).

Step 8: Reconnect the starter wiring

• Install the main battery cable eyelet onto the B+ stud, then install the nut.
• Use a torque wrench (10-80 ft-lbs range) and 12mm socket: Torque to 9.8 Nm (87 in-lbs).
• Re-seat the rubber boot over the stud.
• Reconnect the small starter signal connector until it clicks.

Step 9: Reinstall the splash shield and lower the car

• Reinstall the splash shield using the 10mm socket and flat trim clip tool.
• Use the floor jack (rated 2-ton minimum) to lift slightly, remove the jack stands (rated 2-ton minimum), then lower the car.

Step 10: Reconnect the battery

• Install the negative (-) battery terminal back onto the battery post.
• Use a 10mm socket and 3/8" drive ratchet to tighten the clamp: Torque to 5.4 Nm (48 in-lbs).

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✅ After Repair

• 🧪 Start the engine and confirm it cranks strongly with no clicking/grinding noises.
• 🧪 Check that the starter cable boot is fully covering the stud and the wiring is not touching the exhaust or rotating parts.
• 🧪 If you get a no-crank after install, recheck the battery terminal tightness and the small signal connector click-in.

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💰 DIY vs Shop Cost

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

DIY Cost: $120-$300 (parts only)

You Save: $330-$550 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 hours.

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🎯 Ready to get started?

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