What has the dealer told you about this? Surely you’re within the 5years 60k power train warranty. Right?

 

I have yet to take it to the dealer - I've been hesitant because everyone whose taken it in for the same issue has had very little luck. That said, it is my next step, and I'll report back what I hear from them.

 

Have you had the transmission software update done for the ZF 9 speed? TSB 19-124 if I recall correctly.

It is not meant to address this particular issue, but I think most people who have had it done would agree that it improves transmission shifting in general.

 

Also, to confirm it is the 1-2 shift try driving with snow mode enabled as a test - this will start the vehicle in 2nd gear and avoid the 1-2 shift entirely.

 

Interesting - just took it out to test. It was much harder to reproduce, and I'm not sure I did once, while in Snow mode. I was able to reproduce the issue same as before before going into Snow mode on the same drive, however.

 

Sounds to me like the software is shifting into 2nd when you lift your foot off the accelerator pedal and then having trouble deciding if it wants to shift back into 1st when you get back on it, delaying throttle response until it sorts itself out.

If it were a hardware problem you would likely get an error code and/or not see a difference when driving in snow mode.

Since you probably don't want to drive around in snow mode all the time I'd start by asking the dealer to do the software update per TSB 19-124 (unless your dealer has another idea).

Any chance you have a scantool (or anything else) that tells you what gear you are in?

 

I wish I had answers. I took my 2019 Honda Odyssey in today because I was having the acceleration hesitation. They tried to update the system and the entire computer system shut down. They aren't sure what is wrong with it. They have only seen this happen with a Honda Pilot. They think a transmission control module will help ($847) but can't make any promises. I expected better from a Honda. I'm so disappointed.

 

transmission control module will help ($847)

They won’t cover this under warranty?

 

I have this exact issue with delayed acceleration. Have not tried the transmission reset -- will do that tomorrow. BUT - I just saw the recall that came out mid december for fuel pumps. Wondering if fuel pump issues might be affecting acceleration?

 

@UsedToBeCoolTX
The fuel pump would not cause a short delay in acceleration. I would cause less volume so your entire time you held down the gas pedal it would not get enough volume of fuel and give poor RPM. Or it would just starve out of gas and die. I never have been a big fan of rubber impellers, they have a tendency in the long run bend as they do in normal operation and weaken allow the gas to bypass the rubber impeller and the metal (or plastic) wall it's pushing the gas through. The old rubber diaphragm pump also met ti's demise due to weakness of it's own design of pumping in and out, it could not do high pressure fuel systems like a impeller. Diesels use a metal impeller to push into fuel injectors. I am more curious as to what type of pump does NASA use on rocket engine and also their hydraulics...

 

I’ve mentioned this in my build thread. I may not had had it so badly. But cleaning out the fuel system (includes throttle) and a full relearn totally fixed the thing that most people blame the 9 speed for.

 

I did a throttle body clean a while back. I did not do a relearn. For relearn, are you talking about the reset mentioned above?... ("recommended in this thread: Transmission Survey + 9/10 speed detailed info (One thread to rule them all) | Honda Odyssey Forum (odyclub.com) with no luck (turn ACC on, press and hold gas pedal for 15 sec, turn off)

 

for mine they cleaned the fuel system including the throttle body. Then the relearn is basically for accelerator pedal to properly work with the throttle. This really made night and day difference the van is very much ready to go! No longer feeling dead. Most people are blaming this on the transmission but it’s most likely improper calibration from factory.

Relarn is done with Honda HDS software by a tech.

 

Same problem here on my 2019 Honda Odyssey Took it to the dealership for warranty and they couldn't find anything wrong. The said "if you're feeling something like that it's just because the engine hasn't warmed up yet". I don't have any solutions. Just wanted to put it out there that there's a real problem with these cars and it is a dangerous one.

 

@HoldOnNotDoneAccelerating I got a throttle body cleaning and then did the "relearn" recommended in this thread where you hold down the pedal etc. There was an almost instantaneous improvement. After 500 miles or so, during which the computer is ostensibly adapting to your driving habits, there is some hesitation returning but it is still FAR less than there was before. Give it a try!

 

I was having the same shifting delay/hesitation issue on my 2019 Honda Odyssey EX-L (54166 miles): and having the throttle body cleaned, and doing an idle relearn - seems to have fixed the problem.


I took my 2019 Honda Odyssey EX-L to the dealership 2 days ago, And the supervisor explained that it might be a dirty throttle body (carbon build up in the throttle body) And that she has seen a lot of 9 speeds (2018 - 2022) that have this issue with a dirty throttle body. They did a diagnostic test and the throttle body was very dirty. The diagnostic test checked - what she referred to as a “drive-by wire” (DBW) ratio; My DBW ratio was at 100% - and the throttle plate (butterfly valve ) was stuck closed. (So, not good)….
The supervisor said that if the DBW ratio is over 50%, then they suggest servicing the throttle body. (See image below - of my Honda paperwork).

So, it sounds like- if the throttle plate/valve is stuck, then this can be confusing for the car’s computer: as it is trying to figure out how to communicate with the transmission.
The supervisor, who I talked to, was at “Stockton 12 Honda”, in Sandy, Utah. Her name is Kate, and she knew all about this issue. If you’re looking for someone that knows abou this - you could call her at Stockton 12 Honda - phone number is: 435-246-4344.
Good luck.

 

Thank you all, this thread on 1st gear hesitation is super useful. My 2019 Odyssey with 50K miles is experiencing the same hesitation issue, has been in 2 situations where it's been extremely dangerous (pulling out into traffic and the throttle hesitates for 2 seconds!) I will take these suggestions for throttle body cleaning and idle relearn to my local dealer and let you know how it turns out.

 

Just a heads up on my experience. I did throttle body cleaning and transmission relearn and seemed to get some improvement at first, but then it got worse. At dealership tech found that it was throwing a temporary fault code P2101 Electronic Throttle Control System (ETCS) Malfunction. "Temporary" in that it did not trigger the check engine light, which would have had this whole issue resolved a lot sooner 🤯. Long story short, they diagnosed a failure of the throttle body itself, and replaced the throttle body. I have had no issues in the several months since.

SO... definitely try the cleaning and the relearn first 🤞, but might also be worth asking them to see if you are getting this temporary fault code. That way if your conservative measures don't work, you might solve it by replacing the part.

Between this, my tailgate failure, and a hard shifting issue right from the start, I've had a real disappointing (and expensive) experience with the 2019 Odyssey after having several great Hondas.

Good luck!

 

Wow, very helpful as well, thank you!! Will keep an eye on that for escalation.

 

Sorry just fixed those links to the tailgate and hard shift threads.