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HELP! Transmission/TCM problems?!

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HELP! Transmission/TCM problems?!

 
Old 04-13-2018, 03:08 PM
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Default HELP! Transmission/TCM problems?!



Gear indicators
Hi everyone, having a bit of a problem with my 2001 A8L D2 transmission. Drove it in this morning and everything functioned fine. However A little while (5 mins) after getting in this afternoon the car has acceleration problems, as if the transmission is slipping. The engine functions ok but the shifting is incorrect and when it does shift it shutters a bit. Nursed it home doing about 45-50 (I live about 7miles from town). It should be noted that upon entering the highway and trying to gain a bit of speed all of the gear indicator lights lit up, leading me to believe this is an electrical issue with the TCM or some such component. I restarted the car and the lights didnít all come on again until I took on a small hill before my house. About a minute after that my check engine light came on. I checked the code with my onboard reader and itís a PO170. Which I know can mean a lot of things but Iím most interested in the Mass Airflow Sensor as ive heard that can cause transmission malfunction. I donít want to take it in to a shop because there are not many around here and the closest Audi dealer is 4 hours away. On a final note, all the gears function properly (Reverse, 1-5, Neautral, Park and Tiptronic). Help much appreciated! Mostly wondering if the PO170 has anything to do with it or how to tell if itís mechanical instead of electrical. Thank you!!!
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Old 04-14-2018, 07:23 AM
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All the positions lit up is usually not a good sign; I believe it means the trans has gone into limp mode, which is only one gear, 5th, according to the info I have.

I couldn't find P0170 in my Bentley manual. What engine code do you have?
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Old 04-14-2018, 07:35 AM
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Thank for replying so soon! Quick thought wouldent it stay in limp mode once it entered it? Eh I believe the code is in fact PO170 I can double check when I head out to the shop this morning though. I’m no sure(?) The reader (Scangauge 2) only lets me see fault codes. Gonna dig around a bit today and see if I can find water damage anywhere, or loose wires. If the transmission needs replaced I guess so be it. But yesterday it was covered in snow and it got quite warm throughout the day and the snow all melted leading me to believe ya know, water just got somewhere it shouldent. I don’t know haha. I’ll get back on here this evening with what I’ve found
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Old 04-14-2018, 07:17 PM
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Originally Posted by flythebigsky View Post
Thank for replying so soon! Quick thought wouldent it stay in limp mode once it entered it? Eh I believe the...
Agree with Hillpc, trans failure is starting. There are cases where a transmission will go in limp mode. The owner will pull over and turn the car off and then back on. The transmission will reset itself and operate fine for a short time. Another indicator is the fact you drove the car for 5 minutes and went in to limp mode. As the transmission heat up from driving, the trans will slip causing limp mode.

I hope I'm wrong and it's just a water issue.

Good luck.
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Old 04-14-2018, 11:25 PM
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Originally Posted by 2001 S8 View Post
Agree with Hillpc, trans failure is starting. There are cases where a transmission will go in limp mode. The owner will pull over and turn the car off and then back on. The transmission will reset itself and operate fine for a short time. Another indicator is the fact you drove the car for 5 minutes and went in to limp mode. As the transmission heat up from driving, the trans will slip causing limp mode.

I hope I'm wrong and it's just a water issue.

Good luck.
Iím starting to think you guys are more and more correct about it being the actual transmission. Started it just for fun tonight as I couldnít really do anymore digging due to time restrictions. Anyways what resulted was a second code, PO733. Unlike PO170 it has to do directly with the tranny, which is worrisome. As I said if it needs a new tranny I guess so be it. Iím not sure of the last time it was flushed but Iíve heard thatís honestly not cheap. The ony hope Iím holding on to is the fact that the transmission had NO anomilaies before that day. And all of a sudden it just doesnít work? I donít know a lot about transmission if thereís anymore insight itís greatly appreciated. For now though I think Iím gonna go with probably the cheapest option at the moment and get another TMC. Hopefully it works but Iím prepared for it not to knowing my luck haha. Anyways thx again for all the help everyone. I will upload a YouTube video of a little drive I took, the last drive before having to replace somthing big haha. Iíll get back to you guys with the link tomorrow. Internet slow here.
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Old 04-16-2018, 07:31 AM
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Hereís the video I was referring to earlier. (
) - I apologize for the quality. Also it should be noted that the shaking near the end is me trying to operate tiptronic, stay on the road, and video at the same time😂 But there for sure is shuttering. Going in today to check prices on a transmission fluid check and change, as that is due for service anyways. If shops here can do it Iíll most likely get it done tomorrow. Will keep this forum updated as I really want to figure out the problem. Love the car and how much of a joy it is to drive and I miss it already😥
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Old 04-17-2018, 05:22 AM
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Default Limp mode.

99.9% sure it is a clutch A basket. It needs a rebuild.
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Old 04-17-2018, 09:14 AM
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Originally Posted by tozoM8 View Post
99.9% sure it is a clutch A basket. It needs a rebuild.
Yeh, Iíve read about that haha. Would it cost less to get another transmission or rebuild the clutch? Thx for the input👍
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Old 04-17-2018, 06:44 PM
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Calling Bozeman Audi tomorrow�� Shops around here useless and I guess if they charge a lot they charge a lot but we’ll see.
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Old 04-18-2018, 08:01 AM
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Most dealers will outsource the job, you might look for ZF rebuilders in your area. If it were my car and was worth the cost of repair I would buy a good used transmission, FUN code, and replace the lower valve body on it and install the Transgo replacement valve. Then new seals and install it. I have little faith in rebuilds other than by known-good techs like Tozo. Rebuilders often cut corners and do not address the root cause, and the trans may never be right and may even fail again soon.

I had a really nice FUN code trans (spare part for my 2001) I sold to a list member called Dr. A8 who is located near Salt Lake, his car was wrecked before he installed it. If he still has the trans you might consider getting it and having it installed, maybe $2500 all in.
A rebuild is likely $4000 and if your car would be worth $3000 (perhaps an optimistic price) with a good trans you might not wish to perform the work.

Good luck,
-Joel.
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