🔧 Altima - Starter Motor Replacement

Replacing the starter motor on your Altima means removing the failed electric motor that cranks the engine and installing a new one. On the 2.5L engine, the starter is mounted low on the transmission side of the engine, so access is usually from above and below.

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

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⚠️ Safety & Precautions

• ⚠️ Disconnect the negative battery cable before touching the starter wiring. The main starter cable is always battery-powered.
• ⚠️ Let the engine cool before starting. The starter sits near hot engine and exhaust areas.
• ⚠️ Support your Altima with jack stands if lifting it. Never work under a vehicle held only by a floor jack.
• ⚠️ Keep the key fob away from the vehicle while working to prevent accidental power-up.
• ⚠️ CVT wiring and harnesses are nearby. Do not pull on connectors or pry against wiring.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 13mm socket
• 14mm socket
• 3/8-inch drive ratchet
• 3/8-inch drive 6-inch extension
• 3/8-inch drive universal joint
• Torque wrench 5-80 ft-lb range
• Flathead screwdriver
• Trim clip removal tool
• Needle-nose pliers
• Floor jack rated 2-ton minimum
• Jack stands rated 2-ton minimum
• Wheel chocks
• Work gloves
• Safety glasses
• Battery terminal brush

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Starter motor - Qty: 1
• Starter mounting bolts - Qty: 2, replace if damaged or heavily corroded
• Battery terminal protectant - Qty: 1

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📋 Before You Begin

• Park your Altima on level ground, shift to Park, and apply the parking brake.
• Place wheel chocks behind the rear wheels.
• Open the hood and allow the engine to cool fully.
• Disconnect the negative battery cable using a 10mm socket. A negative cable is the black cable marked “−”.
• If lifting the front of the vehicle, use a floor jack at the front center jacking point and place jack stands under the front pinch weld support points.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect Battery Power

• Use a 10mm socket to loosen the negative battery terminal clamp.
• Lift the negative cable off the battery post and tuck it aside so it cannot spring back.
• Use a battery terminal brush to clean corrosion from the terminal if needed.
• Always disconnect negative first.

Step 2: Raise and Support the Front

• Place wheel chocks behind both rear wheels.
• Use a floor jack rated 2-ton minimum to raise the front of your Altima.
• Place jack stands rated 2-ton minimum under the front support points.
• Gently lower the car onto the stands and shake the vehicle lightly to confirm it is stable.
• Never trust the jack alone.

Step 3: Remove the Lower Splash Shield

• Put on safety glasses and work gloves.
• Use a trim clip removal tool to remove plastic clips from the lower engine splash shield.
• Use a 10mm socket to remove any splash shield bolts.
• Lower the shield and set it aside.
• A splash shield is the plastic panel under the engine that protects it from road debris.

Step 4: Locate the Starter Motor

• From underneath, look toward the transmission bellhousing on the driver-side/lower rear area of the 2.5L engine.
• The starter is a small cylindrical electric motor with one thick battery cable and one small control-wire connector attached.
• Use a flashlight if available, but do not pry on wiring or hoses.

Step 5: Disconnect the Small Starter Signal Connector

• Use your fingers or needle-nose pliers to press the locking tab on the small starter connector.
• Pull the connector straight off the starter solenoid. The solenoid is the smaller round part mounted on the starter that switches power to the motor.
• If stuck, use a flathead screwdriver gently under the connector body, not the wires.

Step 6: Remove the Main Starter Cable

• Pull back the rubber protective boot from the large starter cable terminal.
• Use a 12mm socket or 13mm socket to remove the nut from the main starter cable stud, depending on the replacement/installed starter hardware.
• Lift the cable eyelet off the starter stud and move it aside.
• Do not let the cable touch metal parts, even though the battery is disconnected.

Step 7: Remove the Starter Mounting Bolts

• Support the starter with one hand before removing the last bolt. It is heavier than it looks.
• Use a 14mm socket, 3/8-inch drive ratchet, and 3/8-inch drive 6-inch extension to loosen the starter mounting bolts.
• Use a 3/8-inch drive universal joint if the ratchet angle is tight. A universal joint lets the socket turn at a slight angle.
• Remove both starter mounting bolts and keep them organized.

Step 8: Remove the Old Starter

• Carefully slide the starter out of the transmission bellhousing.
• Rotate the starter as needed to clear brackets and wiring.
• Do not force it. If it will not move, confirm both mounting bolts are fully removed.

Step 9: Compare Old and New Starters

• Place the old and new starter motor side by side.
• Check that the mounting ears, gear position, electrical terminals, and overall length match.
• Use a flathead screwdriver only to move protective boots or caps, not to pry on the starter gear.

Step 10: Install the New Starter

• Position the new starter motor into the bellhousing opening by hand.
• Start both mounting bolts by hand first to avoid cross-threading.
• Use a 14mm socket, 3/8-inch drive ratchet, and extension to snug the bolts evenly.
• Use a torque wrench 5-80 ft-lb range to tighten the starter mounting bolts to Torque to 55 Nm (41 ft-lbs).

Step 11: Reconnect the Main Starter Cable

• Place the large cable eyelet onto the starter terminal stud.
• Install the retaining nut by hand first.
• Use a 12mm socket or 13mm socket with the torque wrench 5-80 ft-lb range to tighten the terminal nut to Torque to 9 Nm (80 in-lbs).
• Push the rubber protective boot fully back over the terminal.
• Do not overtighten the stud.

Step 12: Reconnect the Small Signal Connector

• Push the small connector onto the starter solenoid until it clicks.
• Use your fingers to gently tug the connector and confirm it is locked in place.
• If needed, use needle-nose pliers to position the connector, but do not squeeze the wires.

Step 13: Reinstall the Lower Splash Shield

• Raise the splash shield into position by hand.
• Install plastic clips using the trim clip removal tool handle or your thumb.
• Use a 10mm socket to reinstall splash shield bolts.
• Snug the 10mm splash shield bolts gently to Torque to 5 Nm (44 in-lbs).

Step 14: Lower the Vehicle

• Use the floor jack rated 2-ton minimum to lift the front slightly off the jack stands.
• Remove the jack stands rated 2-ton minimum.
• Lower your Altima slowly to the ground.
• Remove the wheel chocks.

Step 15: Reconnect the Battery

• Apply battery terminal protectant to the clean negative battery terminal if available.
• Place the negative cable back onto the battery post.
• Use a 10mm socket to tighten the clamp until it is secure.
• Do not overtighten. The terminal should not rotate by hand.

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✅ After Repair

• ✅ Start your Altima and listen for smooth cranking. It should crank strongly without grinding or clicking.
• ✅ If it only clicks, recheck the battery terminals and both starter electrical connections.
• ✅ If it cranks but sounds harsh or grinding, stop immediately and recheck starter seating and mounting bolts.
• ✅ Verify the battery warning light turns off after the engine starts.
• ✅ Road test briefly, then recheck underneath for loose splash shield clips or rattles.
• ✅ Reset clock, radio presets, and auto window initialization if battery disconnect caused memory loss.

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💰 DIY vs Shop Cost

Shop Cost: $450-$750 (parts + labor)

DIY Cost: $180-$380 (parts only)

You Save: $270-$370 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

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