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Unfortunatly those early odyssey transmissions were junk. They tend to either loose first gear, or have a VERY hard shift from 2nd to 3rd. My family had an 01 odyssey that made it to 286 000 km before the tranny went up. -it wasn’t even the clutches, turned out to be a bad main bearing, cauing the transmission to overheat and puke out its oil.
In your case, I would check the connections from that speed sensor and follow the wiring making sure there are no breaks in the wire or corrosion in the connectors. The flashing TCS and flickering D seems to point to an electrical issue, such as a weak ground. Usually, the TCS will flash when its activated when a wheel looses traction. Follow every inch of wiring from the transmission to the computer. The harness could be pinched and shorting out.
Another test is to start off in D1 and manually shift to 2, then 3, then D. See how it shifts. If it shifts normally, it is deffinatly not an internal problem. Its either a wire or sensor. If it shifts the same, I would drain a bit of the transmission oil and check the colour of it and check the bolt/magnet for exessive clutch material. If you see alot of brown/black goo on the bolt and brow/black transmission fluid, your tranny’s had it.
I’m sure there are other tests, but this should help point you in the right direction.
Quoted From -BiRkS_:
Unfortunatly those early odyssey transmissions were junk. They tend to either loose first gear, or have a VERY hard shift from 2nd to 3rd. My family had an 01 odyssey that made it to 286 000 km before the tranny went up. -it wasn’t even the clutches, turned out to be a bad main bearing, cauing the transmission to overheat and puke out its oil.
In your case, I would check the connections from that speed sensor and follow the wiring making sure there are no breaks in the wire or corrosion in the connectors. The flashing TCS and flickering D seems to point to an electrical issue, such as a weak ground. Usually, the TCS will flash when its activated when a wheel looses traction. Follow every inch of wiring from the transmission to the computer. The harness could be pinched and shorting out.
Another test is to start off in D1 and manually shift to 2, then 3, then D. See how it shifts. If it shifts normally, it is deffinatly not an internal problem. Its either a wire or sensor. If it shifts the same, I would drain a bit of the transmission oil and check the colour of it and check the bolt/magnet for exessive clutch material. If you see alot of brown/black goo on the bolt and brow/black transmission fluid, your tranny’s had it.
I’m sure there are other tests, but this should help point you in the right direction.
Thanks !
I will try out the shifting from D1 through D manually and see how it works. As far as the color of the tranny oil, it seems to be fine just checking the dipstick. Also, it was flushed less than 10k before. So I amhoping that is not an issue.
My mechanic was also saying that he will trace the wiring to the computer and check the grounds. So your suggestion is in line with your reply. I really hope that it is not a transmission internal issue. I will post further after I find more. Thanks again for very useful tips/anaylsis
Man, whenever I hear “transmission flush” I cringe a bit. But Eric has mentioned that these transmissions are pretty much garbage. I would definitely follow the above posts first and hope for the best. Good luck.
Quoted From unnishilpa:
Thanks !
I will try out the shifting from D1 through D manually and see how it works. As far as the color of the tranny oil, it seems to be fine just checking the dipstick. Also, it was flushed less than 10k before. So I amhoping that is not an issue.
My mechanic was also saying that he will trace the wiring to the computer and check the grounds. So your suggestion is in line with your reply. I really hope that it is not a transmission internal issue. I will post further after I find more. Thanks again for very useful tips/anaylsis
Birks, Great suggestion on trying D1 through D3.
I tried it today. Is shifts fine when I use 1, 2 and D3. The D is not flashing also. The other thing I noticed is that the speedo is working when I use the lower gears. It looks like it does not go into limp mode (safe mode) when I use D1 through D3. I have not pushed beyond 40 miles though.Based on the above, is it safe to assume that the tranny is fine ? Any other suggestion on trouble shooting ?
I’m driving my 2001 Odyssey in exactly the same way (shifting manually to get it around) but I would not trust it on the highway, I just drive it locally at speeds below highway as I’ve seen those transmission lock up the front wheels unexpectedly and I wouldn’t want to deal with that while driving at highway speed. As stated those transmissions are a problem and by the sound of it you’ll need to replace it. I don’t recommend a salvage yard unit based on their history of failure as you might end up putting another bad one in, your best bet would be a remanufactured one. SOME transmission shops will be able to do the rebuild but choose VERY carefully and make sure they have Honda experience AND a transmission dyno to test it when it’s done because Honda automatics are very different than most other transmissions and if you don’t know what you’re doing with them they should be left alone.
Quoted From EricTheCarGuy:
I’m driving my 2001 Odyssey in exactly the same way (shifting manually to get it around) but I would not trust it on the highway, I just drive it locally at speeds below highway as I’ve seen those transmission lock up the front wheels unexpectedly and I wouldn’t want to deal with that while driving at highway speed. As stated those transmissions are a problem and by the sound of it you’ll need to replace it. I don’t recommend a salvage yard unit based on their history of failure as you might end up putting another bad one in, your best bet would be a remanufactured one. SOME transmission shops will be able to do the rebuild but choose VERY carefully and make sure they have Honda experience AND a transmission dyno to test it when it’s done because Honda automatics are very different than most other transmissions and if you don’t know what you’re doing with them they should be left alone.
Eric,
Thanks. So are you almost certain that it is the transmission. My mechanic came back and told me that he checked the wiring and could not find anything wrong there. So he is going to check the computer. I was hoping that it is not the transmission. One more question. Is there a way to confirm that it is the transmission ? If so, why is it giving only P0720 and not any internal codes like ratio issues ?
When at the Acura dealer I was putting in 2 sometimes 3 of those V6 transmissions in a day for 3 years straight, it’s so common in my experience it’s not worth doing anything but replacing the transmission as it usually ends up being a waste of time to try and find a cause elsewhere, I’m not saying it’s a bad idea I just haven’t found any other cause besides a transmission failure and if I did it was so rare it’s not worth mentioning.
Quoted From EricTheCarGuy:
When at the Acura dealer I was putting in 2 sometimes 3 of those V6 transmissions in a day for 3 years straight, it’s so common in my experience it’s not worth doing anything but replacing the transmission as it usually ends up being a waste of time to try and find a cause elsewhere, I’m not saying it’s a bad idea I just haven’t found any other cause besides a transmission failure and if I did it was so rare it’s not worth mentioning.
Finally my issue is fixed. Thankfully it was not the transmission. It turned out to be an issue where the wires connected to the computer (from transmission). There was some oily stuff at the connector on the computer that was causing a high resistance. After disconnecting, cleaning up and reconnecting it started working.
So as the code indicated, the “Output shaft speed sensor circuit was malfunctioning”Thanks everyone for the feedbacks
Thanks for posting the fix!
Please turn the traffic light to green so it updates our data base and helps someone else who may be experiencing this issue C8-)
Interesting. Keep us posted if that actually fixes it as I’ve seen them reset themselves after disconnecting connectors like that and then come back later out of the blue. I do hope your’s is fixed however. Speed codes are registered by the speed sensors that come through the different parts of the transmission chase, there’s one for the main shaft and one for the counter shaft which the computer compares the readings of to see if the clutches are slipping or not so unless you found a problem with one of those speed sensors there may still be a problem.
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