Honda M9HA 9-Speed Automatic Transaxle · Honda / Acura · Expert rebuild service since 1987. Lifetime warranty. Free diagnostic.
2017–2022 Honda CR-V (2.4L non-turbo), 2019–2023 Acura RDX, 2019–2022 Acura CDX
| Configuration | 9-speed automatic FWD transaxle |
|---|---|
| Gear Ratios | 1st 5.25:1 · 2nd 3.03:1 · 3rd 1.97:1 · 4th 1.43:1 · 5th 1.11:1 · 6th 0.86:1 · 7th 0.71:1 · 8th 0.60:1 · 9th 0.49:1 · Rev 4.15:1 |
| Fluid Type | Honda ATF-DW1 |
| Fluid Capacity | 8.8 qts total, 4.2 qts service refill |
Early M9HA units had harsh, unpredictable shift behavior addressed through multiple Honda PCM/TCM software updates.
Symptoms: Abrupt 1-2 shift, hunting between gears, hesitation when selecting Drive — check for pending TSBs/updates first
The overdrive 9th gear clutch pack is lightly loaded but can wear prematurely if fluid is degraded. Most common on high-mileage highway vehicles.
Symptoms: Slip at freeway cruise speed, DTC P0879, hunting between 8th and 9th gear
TCC shudder at light cruise in 7th–9th gears is reported on higher-mileage M9HA units.
Symptoms: Light vibration at 55–75 mph, DTC P0740, shudder reduces with fresh ATF-DW1
M9HA rebuild replaces all nine-speed clutch packs, torque converter, and all solenoids. PCM/TCM is updated to latest Honda calibration before delivery. ATF-DW1 is used throughout. All seals and bearings renewed.
Honda ATF-DW1 every 30,000 miles. If you experience early shift quality issues, check for Honda TSB updates before authorizing major repairs — many early shift complaints are resolved with a free software update.
2017–2022 Honda CR-V (non-turbo), 2019–2023 Acura RDX, and 2019–2022 Acura CDX.
The M9HA is generally reliable when fluid is maintained, but early software issues and TCC shudder on high-mileage units are common complaints.
Not necessarily. Check for Honda/Acura TSBs first — many harsh shift complaints on the M9HA are resolved with a free PCM calibration update.
A full rebuild ranges $2,100–$2,700 at Chicago Transmission.
Honda ATF-DW1.
Free diagnostic, written estimate, lifetime warranty. Chicago's M9HA rebuild specialists since 1987.
