🔧 Odyssey - Transmission Fluid Drain & Refill

This service replaces a portion of your A/T fluid by draining the transmission pan and refilling through the dipstick tube. On your Odyssey, the correct approach is a drain-and-refill (not a power flush) to keep shift quality and transmission life in good shape.

Difficulty Level: Beginner | Estimated Time: 1-2 hours

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⚠️ Safety & Precautions

• ⚠️ Transmission fluid can be very hot; let the van cool 20-30 minutes if needed.
• ⚠️ Support the van with jack stands on solid, level ground; never rely on a floor jack alone.
• ⚠️ Keep the van level while draining/filling for an accurate fluid level.
• ⚠️ Do not mix fluids; use only Honda ATF DW-1 compatible fluid.
• ⚠️ Battery disconnect is not required for this service.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• 17mm socket
• 3/8" drive ratchet
• Torque wrench (10-100 ft-lbs range)
• Drain pan (8-quart minimum)
• Long-neck funnel
• Fluid measuring container (at least 4 quarts)
• Shop rags
• Trim clip removal tool

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid (Honda ATF DW-1 equivalent) - Qty: 4 quarts
• Transmission drain plug crush washer - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear tires.
• Warm the transmission with a 10-15 minute drive so the old fluid drains more completely.
• Open the hood and locate the transmission dipstick (this is where you’ll refill).
• Measure what drains out; refill the same amount.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and support the van

• Use a floor jack (rated 3-ton minimum) to lift the front of the van at the proper front jacking point.
• Place jack stands (rated 3-ton minimum) under the proper support points and lower the van onto them.
• Confirm the van is stable and sitting level (important for the fluid level check).

Step 2: Access the transmission drain plug

• If a lower splash shield is in the way, remove the plastic clips using a trim clip removal tool and move the shield aside.
• Position an 8-quart drain pan under the transmission drain plug.

Step 3: Drain the old transmission fluid

• Use a 17mm socket with a 3/8" drive ratchet to loosen and remove the drain plug.
• Let the fluid drain completely into the pan (this may take several minutes).
• Pour the drained fluid into a fluid measuring container and record the amount (usually around 3-4 quarts for a drain-and-refill).

Step 4: Reinstall the drain plug with a new crush washer

• Remove the old washer from the drain plug and install the new drain plug crush washer.
• Thread the drain plug in by hand first to avoid cross-threading.
• Tighten using a torque wrench: Torque to 49 Nm (36 ft-lbs).
• Wipe the area clean using shop rags.

Step 5: Refill with the correct amount of ATF

• Under the hood, remove the transmission dipstick and insert a long-neck funnel into the dipstick tube.
• Pour in the same amount you measured out using Honda ATF DW-1 equivalent.
• Reinstall the dipstick fully.

Step 6: Circulate fluid and check for leaks

• Start the engine and keep your foot on the brake.
• Move the shifter slowly through P-R-N-D and back to P, pausing 2-3 seconds in each position.
• With the engine still running, look underneath for any leaks at the drain plug.

Step 7: Set final level on the dipstick

• Lower the van off the jack stands using the floor jack.
• With the van on level ground, bring the transmission to normal operating temperature (a short drive helps).
• Park, leave the engine off, wait about 60-90 seconds, then check the dipstick.
• Wipe, reinsert fully, and recheck. Add fluid in small amounts (about 0.25 quart at a time) using the long-neck funnel if needed.
• Don’t overfill; it can cause shifting issues.

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✅ After Repair

• Test drive 10-15 minutes and confirm smooth shifting.
• Recheck underneath for seepage around the drain plug.
• Recheck the dipstick level once more on level ground after the drive.
• Dispose of used ATF at a recycling center or auto parts store that accepts fluids.
• If fluid was very dark, consider a 3x drain/refill.

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💰 DIY vs Shop Cost

Shop Cost: $180-$350 (parts + labor)

DIY Cost: $35-$80 (parts only)

You Save: $145-$270 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-2 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.