🔧 Altima - Starter Motor Replacement

Your starter motor cranks the engine when you turn the key. If it’s failing, you may hear a single click, slow cranking, or nothing at all even with a good battery.

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

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⚠️ Safety & Precautions

• ⚠️ Disconnect the battery first to prevent a short (the starter cable is always “hot”).
• ⚠️ Support your Altima with jack stands before going underneath—never rely on a floor jack alone.
• ⚠️ Let the exhaust cool completely if the car was recently driven.
• ⚠️ Keep tools away from the starter power stud and metal brackets at the same time.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• Wheel chocks
• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" drive ratchet
• 3/8" drive extension set (3" and 6")
• 3/8" drive wobble extension
• Torque wrench (10–100 ft-lb range)
• Flathead screwdriver
• Needle-nose pliers
• Trim clip removal tool
• Work light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Starter motor (2.5L) - Qty: 1
• Starter electrical terminal nut kit - Qty: 1
• Battery terminal anti-corrosion pads - Qty: 1

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📋 Before You Begin

• Park on level ground, shift into neutral, and set the parking brake.
• Place wheel chocks behind the rear tires.
• Open the hood and make sure you have your radio presets (battery will be disconnected).
• Battery disconnect is required: always remove the negative terminal first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the battery

• Use a 10mm socket to loosen the negative battery terminal and remove it from the battery post.
• Tuck the cable aside so it can’t spring back onto the post.
• Tip: Negative off first, on last.

Step 2: Raise and support the front of the car

• Use a floor jack to lift the front jack point.
• Set the car down onto jack stands at the proper support points.
• Give the car a gentle shake to confirm it’s stable before crawling underneath.

Step 3: Remove the lower engine splash shield (if equipped)

• Use a trim clip removal tool and flathead screwdriver to remove the plastic clips/screws holding the splash shield.
• Set the shield and clips aside in a small pile so nothing gets lost.

Step 4: Locate the starter motor

• Use a work light and look where the engine meets the transmission (bellhousing area).
• The starter is a small motor with a thicker battery cable attached to a stud and a smaller signal wire connector.

Step 5: Disconnect the starter wiring

• Use needle-nose pliers to carefully release the lock and unplug the small starter signal connector.
• Use a 12mm socket to remove the nut on the large power cable (B+ cable) from the starter stud.
• Move the cable aside so it can’t touch metal.
• A “stud” is a fixed threaded post.

Step 6: Remove the starter mounting bolts

• Use a 14mm socket, 3/8" ratchet, and a 6" extension (add a wobble extension if needed) to remove the starter mounting bolts.
• Support the starter with one hand as the last bolt comes out so it doesn’t drop.

Step 7: Remove the starter

• Work the starter out of the bellhousing area by lowering the nose first, then rotating the body as needed.
• If it hangs up, use the work light and check for any wiring clips still attached.

Step 8: Install the new starter

• Position the new starter into place by hand (start it the same way the old one came out).
• Thread the mounting bolts in by hand first to avoid cross-threading.
• Use a 14mm socket and torque wrench to tighten the starter mounting bolts: Torque to 49 N·m (36 ft-lb).

Step 9: Reconnect the starter wiring

• Install the large power cable onto the starter stud and tighten with a 12mm socket: Torque to 9 N·m (80 in-lb).
• Plug in the small signal connector until it clicks into place.
• Double-check the cable routing so it can’t rub on sharp edges or touch the exhaust.

Step 10: Reinstall the splash shield and lower the car

• Reinstall the splash shield using the trim clip removal tool and flathead screwdriver.
• Use the floor jack to lift slightly, remove the jack stands, and lower the car.

Step 11: Reconnect the battery

• Install anti-corrosion pads (if you’re using them).
• Reconnect the negative battery terminal using a 10mm socket: Torque to 5 N·m (44 in-lb).

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✅ After Repair

• Start the engine and confirm it cranks strongly and starts normally.
• With the engine running, check that the battery light is off and there are no unusual noises near the bellhousing.
• Recheck the starter power cable nut after a short test drive (make sure it’s still snug).

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💰 DIY vs Shop Cost

Shop Cost: $450–$900 (parts + labor)

DIY Cost: $120–$300 (parts only)

You Save: $330–$600 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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