2021 Honda Odyssey: Transmission Fluid and Service
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
Working on this 2021 Honda Odyssey? Run just this one job through Repairius.
No big switch. Write the estimate, text it for approval, and get paid on your phone. Keep everything else the way it is.
14-day free trial · credit card required · cancel anytime
Quick answer
- Transmission make/model: Honda ZF 9HP48 9-speed automatic transmission
- OEM fluid spec: Honda ATF DW-1
- Drain & fill capacity: 3.5 quarts
- Full overhaul capacity: 9.5 quarts
- Filter OEM part number: Verify with dealer or service manual
- Recommended service interval: 30,000 miles (severe) or 60,000 miles (normal)
Fluid type explained
The 2021 Honda Odyssey is equipped with a ZF 9HP48 9-speed automatic transmission, which requires Honda ATF DW-1. This is a synthetic fluid that is specifically designed for use in Honda automatic transmissions. It provides the required friction and viscosity characteristics for smooth shifting and long-term durability. Use of any other fluid may result in poor shifting, transmission damage, and a voided warranty.
Service procedure
A drain and fill is the most common service procedure. This involves draining the old fluid from the transmission pan, replacing the drain plug washer, and refilling with fresh ATF DW-1. A full exchange, which is typically only necessary during a transmission overhaul, involves removing the transmission from the vehicle and completely disassembling it to clean and inspect all internal components.
Service interval
Honda recommends a transmission fluid change every 30,000 miles for severe driving conditions, which include towing, driving in mountainous terrain, or operating in stop-and-go traffic. For normal driving conditions, the recommended service interval is 60,000 miles.
Common transmission problems
The most common transmission problem reported with the 2021 Honda Odyssey is harsh or erratic shifting. This can be caused by a number of factors, including low fluid level, contaminated fluid, or a software issue. In some cases, a transmission software update may be required to resolve the issue.
Find a trusted shop on Repairius.
More specs for the 2021 Honda Odyssey
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2021 Honda Odyssey Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
Browse by make
Running an auto or diesel repair shop?
Compare Repairius to the shop software you're paying for
$99.99/month (first location included), unlimited users, 14-day free trial.