Used Honda Odyssey 2018-2020: Troubleshooting the 9-Speed Transmission Shift Hesitation
You press the gas pedal to pull into traffic, and for a heart-stopping second or two, nothing happens—the 9-speed transmission in some 2018-2019 Odysseys hesitates before responding, leaving you vulnerable.
That pause when you need power most is frustrating and unsafe. Here’s the thing about the 9-speed automatic in these model years—it was sourced from ZF, not developed by Honda, and it has a documented history of rough shifts, hesitation, and delayed engagement . If your Odyssey is experiencing this problem, you’re not alone, and there are proven steps to address it.
Why Does the 9-Speed Hesitate?
There are two main culprits behind the shift hesitation in 2018-2020 Odyssey models with the 9-speed transmission. The first is a software issue—the Transmission Control Module (TCM) and Powertrain Control Module (PCM) don’t communicate properly, causing mistimed gear shifts . This can result in “rough and delayed shifting, loud noises during shifting, harsh engagement of gears, sudden and harsh accelerations and decelerations, and sudden loss of power” .
The second issue is mechanical. In some vehicles, the transmission end cover sealing gasket was torn during assembly, causing fluid leaks and hydraulic pressure loss . When the fluid level drops, you can experience gear slippage, difficulty shifting, lurching, and even transmission failure .
A 2018-2019 recall also addresses a dangerous issue where the transmission control unit could reboot and unexpectedly shift the vehicle into Park while driving . Dealers secure battery terminal connections and update the TCU software as the fix .
What Owners Are Reporting
Forum discussions and NHTSA complaints paint a clear picture of the problem. Many owners describe an acceleration delay of 1-3 seconds—particularly when the vehicle is at a rolling stop or the driver releases and re-applies the gas pedal. One complaint states: “When the accelerator is slightly pressed, and then released…the transmission jumps to 5th gear. When the accelerator is pressed to complete the turn, the transmission spends several seconds shifting from 4th to 3rd to 2nd before finally accelerating” . This “delay opens up the opportunity to get hit” .
Other common reports include harsh jerking or a “thud” at around 25 mph , and instances where the van “stalls” at intersections, then suddenly jerks forward .
Solutions: From Software to Maintenance
The first and most important step is to ensure your Odyssey’s TCM software is updated. Honda issued a Technical Service Bulletin (TSB 19-124 / 20-030) addressing hard upshifts and DTC P0716. The fix is a TCM software update . After the update, it can take about 500 miles for the TCM to adapt to your driving pattern .
If the problem persists after the software update, the issue could be mechanical. If you’re experiencing the specific symptoms of a fluid leak, the TSB 17-087 addresses replacing the transmission end cover sealing gasket . More severe issues, like torque converter problems or complete transmission failure, have been reported by some owners . If you experience a sudden loss of throttle control without warning codes, some owners have found that cleaning a dirty throttle body helps .
Frequently Asked Questions
Is the 9-speed transmission in the 2018 Odyssey reliable?
It has a mixed reputation. While many owners report trouble-free miles, there is a significant pattern of complaints about rough shifting, hesitation, and, in some cases, failure. Honda issued software updates and a safety recall to address these issues .
What is the TSB for the Honda Odyssey 9-speed transmission?
TSB 19-124 (updated by 20-030) addresses intermittent harsh or jerky upshifts with steady acceleration or a MIL on with DTC P0716. The fix is a software update to the TCM .
Why does my Odyssey hesitate when I press the gas?
This is often caused by a software miscalibration in the TCM, which leads to a delay in gear engagement. It can feel like the car is “thinking” before it moves. The TCM software update is designed to fix this .
How can I fix the transmission hesitation on my 2018 Odyssey?
Take your van to a Honda dealer and ask them to apply the TCM software update as per TSB 19-124 / 20-030. Also, confirm that any open recalls, including the one for the transmission, have been completed on your vehicle .
Have you dealt with the 9-speed hesitation on your Odyssey? What solution worked for you? Share your experience in the comments below.
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