🔧 Altima - CVT Transmission Fluid Change

This repair replaces the continuously variable transmission fluid, called CVT fluid, in your Altima. The CVT uses a steel belt and pulleys instead of normal gears, so it requires the correct Nissan-compatible CVT fluid and a careful fluid-level check at the correct temperature.

Difficulty Level: Intermediate | Estimated Time: 1.5-2.5 hours

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⚠️ Safety & Precautions

• ⚠️ Use only Nissan NS-3 compatible CVT fluid. Regular automatic transmission fluid can damage the CVT.
• ⚠️ CVT fluid can be hot enough to burn skin. Let the vehicle cool before draining, then warm it only as needed for the level check.
• ⚠️ The vehicle must be level when checking the final fluid level. An uneven vehicle can cause overfilling or underfilling.
• ⚠️ Support your Altima with jack stands. Never work under a vehicle supported only by a jack.
• ⚠️ Keep dirt out of the fill tube and drain area. CVTs are sensitive to contamination.
• ⚠️ Battery disconnect is not required for this repair.

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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
• Nitrile gloves
• Drain pan 10-quart minimum
• Ratchet 3/8-inch drive
• 10mm socket
• 19mm socket
• Torque wrench 3/8-inch drive
• Flat-blade screwdriver
• Long-neck funnel
• Fluid transfer pump
• Measuring jug marked in quarts
• Clean shop towels
• OBD2 scan tool with live data
• Infrared thermometer

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Nissan NS-3 compatible CVT fluid - Qty: 5 quarts
• CVT drain plug washer - Qty: 1
• Under-cover clips - Qty: As needed

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📋 Before You Begin

• Park your Altima on a flat, level surface.
• Apply the parking brake and place wheel chocks behind the rear wheels.
• Drive gently for 5-10 minutes if the vehicle is cold, then park and shut it off.
• Let the exhaust and engine area cool enough to work safely.
• Record how much fluid drains out using a measuring jug. This helps you refill the same approximate amount before final level setting.
• A scan tool with live data means a tool that can show sensor readings, including CVT fluid temperature, while the vehicle is running.
• If your scan tool cannot read CVT fluid temperature, use an infrared thermometer on the transmission pan as a backup estimate.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and Support the Vehicle

• Use the floor jack rated 2-ton minimum to lift the front of your Altima at the front center lift point.
• Place the jack stands rated 2-ton minimum under the proper front support points.
• Lower the vehicle gently onto the stands and give the vehicle a light shake to confirm it is stable.
• Use wheel chocks at the rear wheels to help prevent movement.
• Never trust the jack alone.

Step 2: Remove the Lower Engine Under-Cover

• Use a 10mm socket to remove the under-cover bolts.
• Use a flat-blade screwdriver to gently release any plastic clips.
• Set the under-cover aside where it will not be stepped on.
• If clips break, replace them with under-cover clips.

Step 3: Locate the CVT Drain Plug

• Put on safety glasses and nitrile gloves.
• Place the drain pan 10-quart minimum under the CVT drain plug on the bottom of the transmission case.
• Wipe around the drain plug with clean shop towels so dirt does not enter the transmission.

Step 4: Drain the Old CVT Fluid

• Use a 19mm socket and ratchet 3/8-inch drive to loosen the CVT drain plug.
• Remove the plug by hand once loose and let the fluid drain completely into the pan.
• Use the measuring jug marked in quarts to measure the drained fluid amount.
• Write the amount down. You will add about the same amount first.
• Fluid may come out fast.

Step 5: Reinstall the Drain Plug

• Remove the old drain plug washer by hand.
• Install a new CVT drain plug washer onto the drain plug.
• Thread the drain plug in by hand first to prevent cross-threading.
• Use a torque wrench 3/8-inch drive and 19mm socket to tighten the drain plug to Torque to 34 Nm (25 ft-lbs).

Step 6: Access the CVT Fill Tube

• Open the hood and locate the CVT fill tube near the transmission side of the engine bay.
• Use a flat-blade screwdriver to release the locking tab on the fill cap if equipped.
• Remove the fill cap carefully and keep dirt away from the opening.
• A fill tube is the pipe where new CVT fluid is added.

Step 7: Add New CVT Fluid

• Place the long-neck funnel into the CVT fill tube.
• Add Nissan NS-3 compatible CVT fluid slowly.
• Add the same amount that drained out, minus about 0.25 quart to avoid overfilling.
• If access is tight, use the fluid transfer pump to pump fluid into the fill tube.
• Pour slowly to prevent spills.

Step 8: Warm the CVT and Circulate Fluid

• Start the engine with your foot on the brake.
• Use the OBD2 scan tool with live data to monitor CVT fluid temperature if supported.
• Move the shifter slowly through P, R, N, D, and back to P, pausing 3 seconds in each position.
• Keep the engine idling and parking brake applied.
• Warm the CVT fluid to about 35-45°C (95-113°F) for the final level check.
• If using an infrared thermometer, aim it at the CVT pan area for an approximate temperature reading.

Step 9: Check Final Fluid Level

• Keep the vehicle level, engine idling, and shifter in Park.
• Use the long-neck funnel or fluid transfer pump to add small amounts of Nissan NS-3 compatible CVT fluid if needed.
• The correct level procedure on this Altima is temperature-sensitive. The fluid should be set with the CVT fluid near 35-45°C (95-113°F).
• If your Altima has an overflow/check plug, use a 19mm socket to carefully open it during the temperature window. A small steady dribble means the level is correct.
• If no fluid comes out, add CVT fluid in small amounts until it begins to dribble from the check opening.
• Reinstall the check plug by hand first, then tighten with the torque wrench 3/8-inch drive and 19mm socket to Torque to 34 Nm (25 ft-lbs).
• Do not overfill the CVT.

Step 10: Reinstall the Fill Cap and Under-Cover

• Reinstall the CVT fill cap by hand and make sure its lock is fully seated.
• Use clean shop towels to wipe any spilled fluid.
• Raise the under-cover into place.
• Use a 10mm socket to reinstall the under-cover bolts snugly.
• Tighten the under-cover bolts to Torque to 5 Nm (44 in-lbs).

Step 11: Lower the Vehicle

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

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✅ After Repair

• Start the engine and let it idle for 1-2 minutes.
• Shift through all gear positions again with your foot on the brake.
• Check underneath for leaks around the drain plug and check plug area.
• Take a gentle 5-10 minute test drive. Avoid hard acceleration.
• Recheck for leaks after the test drive.
• Dispose of old CVT fluid properly at an approved recycling center or auto parts store.
• No battery registration or infotainment reset is required.

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💰 DIY vs Shop Cost

Shop Cost: $220-$380 (parts + labor)

DIY Cost: $70-$130 (parts only)

You Save: $150-$250 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.5 hours.

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