2005 A4 car tranney problem?
Thread Starter
Racer
Joined: Jan 2011
Posts: 292
Likes: 1
From: Edmond OK
2005 A4 car tranney problem?
The car is 2005 automatic with 40000 miles. I recently changed rear diff to 3.42 from stock 2.73. Car has ram great since, until Tuesday. I drove around all day normal driving combined with some sporty spurts. On wy way home for the evening, I felt a thump in the transmission. When I exited the interstate the car now shifts hard...to the point the wheels chirp at 10 MPH light throttle. The car feels like it is goong to break apart.
I share a code reader with someone and do not have acces to it right now. Autozone ran the code and gave me what I believe to be a geneic code P0700.
P0700...TCM requested mil illumination. Explanation is the TCM has detected an emissions related fault.
After having the code read. I disconnected and reconnected the MAF and the now the car shifts fine, check engine light remains. I had to do this two times on the way home, each time the car was back to normal...check engine light remained.
Any one had this issue before? Any thoughts as to what direction I should go now?
Is the MAF disconnection and reinstall just a coincidence?
Thanks
Brian
I share a code reader with someone and do not have acces to it right now. Autozone ran the code and gave me what I believe to be a geneic code P0700.
P0700...TCM requested mil illumination. Explanation is the TCM has detected an emissions related fault.
After having the code read. I disconnected and reconnected the MAF and the now the car shifts fine, check engine light remains. I had to do this two times on the way home, each time the car was back to normal...check engine light remained.
Any one had this issue before? Any thoughts as to what direction I should go now?
Is the MAF disconnection and reinstall just a coincidence?
Thanks
Brian
Drifting
Joined: Feb 2012
Posts: 1,796
Likes: 37
From: skiatook oklahoma
NOTE: TCM is... Transmission Control System
P0700 Transmission Control System (will show up as PCM code, but is all TCM Related)
This illuminates the Malfunction Indicator Lamp (MIL) to let the driver know there is a problem. If this code is present and the MIL (Malfunction Indicator Lamp) is illuminated that basically means there is at least one transmission code set in the TCM's memory. P0700 is an informational code only. It doesn't point to a direct fault in the engine, only a general fault in the transmission. More diagnosis is necessary to identify what the transmission fault is. This requires a scan tool that will communicate with the transmission module.
For a P0700 the only real solution is to acquire a scan tool that will communicate with the transmission control module. Extracting this code from the TCM will be the first step in repairing the fault in the transmission.
If the TCM compatible scan tool will not communicate with the Transmission Control Module then that is a good indication that there may be a fault with the TCM itself.
Maybe as little as open/shorted circuit (maybe something came unplugged).. i dont know enough to be expert on this, there is a little info here (little)..
http://engine-codes.com/p0700_chevrolet.html
P0700 Transmission Control System (will show up as PCM code, but is all TCM Related)
This illuminates the Malfunction Indicator Lamp (MIL) to let the driver know there is a problem. If this code is present and the MIL (Malfunction Indicator Lamp) is illuminated that basically means there is at least one transmission code set in the TCM's memory. P0700 is an informational code only. It doesn't point to a direct fault in the engine, only a general fault in the transmission. More diagnosis is necessary to identify what the transmission fault is. This requires a scan tool that will communicate with the transmission module.
For a P0700 the only real solution is to acquire a scan tool that will communicate with the transmission control module. Extracting this code from the TCM will be the first step in repairing the fault in the transmission.
If the TCM compatible scan tool will not communicate with the Transmission Control Module then that is a good indication that there may be a fault with the TCM itself.
Maybe as little as open/shorted circuit (maybe something came unplugged).. i dont know enough to be expert on this, there is a little info here (little)..
http://engine-codes.com/p0700_chevrolet.html
Last edited by ChevyDave; Apr 12, 2012 at 04:01 PM. Reason: added note
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Sorry, can't actually diagnose for you but ChevyDave got it. When there is an issue with the auto trans there will be at least 2 codes.....the P0700 plus the code(s) for the actual problem. Haven't seen too many issues with the A4 but with the A6's it usually involves an internal switch in the trans. We'll just hope it's something simple. Please let us know what happens. 
Thread Starter
Racer
Joined: Jan 2011
Posts: 292
Likes: 1
From: Edmond OK
Update!!
I started trouble shooting. P codes were as follows: p0700 trans comm and p0894 trans slipping. Hooked car up to the snap on tool and got TCC readings.
I went back through the wiring on the outside of tranny all good. Then I check fluid level. When I pulled the plug fluid came gushing out...approximately 1/2 to 2/3 a quart. I then let it drain until the flow slowed. Of course the car is running during this.
I then cleared the code and went for a drive. 80 miles later no codes and no hard shifting. It may have just been that I overfilled the trans when I did the work.
Car shifts smooth now. I will let those that are interested if it comes back.
Thanks for the replies...
I started trouble shooting. P codes were as follows: p0700 trans comm and p0894 trans slipping. Hooked car up to the snap on tool and got TCC readings.
I went back through the wiring on the outside of tranny all good. Then I check fluid level. When I pulled the plug fluid came gushing out...approximately 1/2 to 2/3 a quart. I then let it drain until the flow slowed. Of course the car is running during this.
I then cleared the code and went for a drive. 80 miles later no codes and no hard shifting. It may have just been that I overfilled the trans when I did the work.
Car shifts smooth now. I will let those that are interested if it comes back.
Thanks for the replies...
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Thread Starter
Racer
Joined: Jan 2011
Posts: 292
Likes: 1
From: Edmond OK
Ok, guys any help here would be great. I have done all I can think of. I took the car to the dealer and all they could tell me what I already new, yes, I have the two codes and yes they appear to relate to the TCC. So I changed the TCC solomoid. Still have problem and it may be worse now. Car still has hard 1-2 shift and now 3rd gear is neutraling out.
I would like to know, if my tune is not correct will this cause my transmission to act in the manner it is?
Again, I changed from 2.73 to 3.42 rear diff On a 2005 C6 A4 car...
Thanks
I would like to know, if my tune is not correct will this cause my transmission to act in the manner it is?
Again, I changed from 2.73 to 3.42 rear diff On a 2005 C6 A4 car...
Thanks
Instructor
Joined: Apr 2011
Posts: 196
Likes: 8
From: flat out like a lizzard drinking Wisconsin
did your speedo get corrected for gear change? also for the slip code to set or rather for cel to come on the tcm needs to see the problem twice. when you say 3rd gear is neutraling is there no drive at all? for third gear in your trans the forward clutch and the 3-4 clutches are applied when trans shifts from 2nd to 3rd the forward clutch remains on and in 2nd the band is applied for 3rd band releases and 3-4 clutch is applied if 3-4 clutch is bad you should still have the ability to get forward motion but it would be 1st. can your scan tool give you live data? have you tried 3rd instead of o/d on shifter is there any difference?
Thread Starter
Racer
Joined: Jan 2011
Posts: 292
Likes: 1
From: Edmond OK
did your speedo get corrected for gear change? also for the slip code to set or rather for cel to come on the tcm needs to see the problem twice. when you say 3rd gear is neutraling is there no drive at all? for third gear in your trans the forward clutch and the 3-4 clutches are applied when trans shifts from 2nd to 3rd the forward clutch remains on and in 2nd the band is applied for 3rd band releases and 3-4 clutch is applied if 3-4 clutch is bad you should still have the ability to get forward motion but it would be 1st. can your scan tool give you live data? have you tried 3rd instead of o/d on shifter is there any difference?
Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Good Call.....
Not tuning the ECM and TCM correctly can cause that type of problem.
His tuner told him the ecm would adjust for the rear end itself....
RUH ROH.... Send me those computers and let me take a look.
Chuck CoW
Intermediate
Joined: Feb 2009
Posts: 49
Likes: 0
I just went through the same problem. Also at highway cruising if I gave it a little more gas the converter would unlock and lock back and forth. Your tranny will probably last you a few more months and then take a **** like mine did. I was cruising at 150 mph and lost 3rd and 4th gear. Now I'm saving up for a tranny and stall from rpm transmissions.
Le Mans Master
Joined: Aug 2004
Posts: 5,259
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From: Monroe Township New Jersey
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
St. Jude donor in memory of jpee '14
The spedo was correct after rear diff, no change was required. I can get third gear if I manually shift the car. Third gear neutrauls out when using auto--car shifting through the gears in O/D. This is a new problem. At first the only problem I had was hard shifts from car being in limp mode.
You can not swap the rears and change the trans speedo gear as we used to do way back when
Find someone with HP tuners and check out the transmission tab. There are TCC settings and etc that need to be changed. There is also a speedo tab and the vss settings & etc may need to be adjusted. You should also visit the HP tuners web site.
good luck
Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Call me any time.....
I just went through the same problem. Also at highway cruising if I gave it a little more gas the converter would unlock and lock back and forth. Your tranny will probably last you a few more months and then take a **** like mine did. I was cruising at 150 mph and lost 3rd and 4th gear. Now I'm saving up for a tranny and stall from rpm transmissions.
914-332-0049
We've been building strong 4L60e's since they were new....
We've got many options and price structures for you....
Chuck CoW
