Tranny started acting up while I was going through some mountain passes. Shifts were all over the place and hard. Once i got it in overdrive everything was great. I called Mike L. to check with him and we decided since the trans wasn't getting hot and the fluid was fine to keep going. This was in Oregon and I am now in Bowling Green Kentucky. I swung into a parts store and checked out the codes it threw.


1. P0500 Vehicle Speed Sensor Malfunction


2. P0700 Trans. control sys. Malfunction


3. U0073 ?


4. U0100 ?


I will be takin her into the dealer tomorrow. I wonder if they'll have to operate?http://www.dieselplace.com/forum/smileys/Cry.gif

how many miles does your rig have?

The P0700 indicates you have some kind of trans problem; that code comes up all the time just before the real code indicating where to start looking. Looks like a bad speed sensor or circuit. The U codes i would have to look up monday at the shop. Good luck, but i do not see surgery in your Allys future at this point.


mike

Mike- Iwas hoping you would see this post. I was gonna give you a call, but didn't wanna bug you on Sunday. Thanks for the clarification. This thing is really bad now, I gotta get it in first thing in the AM.

DSTRBD


Call me anytime, always glad to help.


mike

Well finally got an update from the dealer here in Bowling Green. They say the computer is fried. They also said that it may be up to a week before they can get a new one down here.http://www.dieselplace.com/forum/smileys/Angry.gif That is unacceptable. I have to check back with them tomorrow to find out exactly when they can get one. This may get ugly.

ECM or TCM?

Okay, now we have a problem. I just got a call from the service manager at the local dealership where my truck is at. They said we are sorry to inform you that your truck will not be fixed until July 3rd. Wait just a minute, JULY 3RD!!! Needless to say, GM customer service got a call. All I can say is they better come up with a solution and fast. Has anyone EVER had a problem like this before? What was the outcome? Bad things are about to happen in Bowling Green.

Why?

Mike did you see the post in the lly forum that the trucks being held are for a front pump failure on the ally. I sure hope this is not true, the ally is the reason I bought this truck. Mine is a 02/04 build and while checking the trans fluid yesterday I noticed some small aluminum flakes in the fluid on the stick. I have aprox 800 mi. Guess I'll get a new filter and cut open the old one. How much debre would be concidered normal for break in? Hopefully someone with first hand knowledge can comment on this. Would be nice to know what the hold is all about, and if earlier trucks were affected. Once again I will say the poster said he heard? and posted no source for that information. thanks Mark

Mike- They cannot come up with a PCM!? I know where I can find one, why can't they?

big buford


I can not see a problem with the Ally pump. I don't see a problem with the Ally period except they could have made the torque converter better as far as the clutch geometry. The TCM makes life miserable for us (they are learning at our expense) and we do things that the Allison was not programed to handle. We have made it pretty strong. Problem is; you guys can't stop making more horsepower!http://www.dieselplace.com/forum/smileys/HiHi.gif We in the trans business are constantly playing catch up with you (us) power mongers. We" endeavor to persevere" Chief Dan George, Josey Wales.http://www.dieselplace.com/forum/smileys/Big Smile.gif


mike

DSTRBD


A little late, I know. Thought you still might want to know what the codes meant.


3. U0073 --Control Module Communication Bus Off


4. U0100 --Lost Communication With ECM/PCM "A"Edited by: neverenuf

I have a dealer contact that MAY know of a wreck that could be a donor.





Also suggested to check grounds, particularly behind the dash as well as general harness condition. Also ignition 1 relay. Quite often U codes etc are wiring faults with pins or grounds. You may just be waiting on a guess that does not work...





No remote start on the truck is there?





Edited by: Kennedy

No remote start.


I think I am waiting on a guess that will not work. The thing about it is, they cannot come up with a fix. We have a good idea what may be the problem, but refuse to help GM fix their mess.


They are fumbling their words and have no answers for me. Their solution was offering me a 1/2 ton reg. cab pickup to take back to MN. Then they would contact me when they came up with a solution. What a joke. I refuse to take anything back but a Crew Cab diesel. I don't think thats too much to ask.


A lawyer has been contacted.

Hate to say it, but sometimes you need to kick these guys in the ass or blind them with a spotlight to get their attention. Might be simpler to show these guys how to do it.





If you can get it to Charlotte...

Well, I am going to get it and take it home unrepaired. I can't sit around and wait for them any longer.

Update


I drove the truck back to MN and brought it to the dealer. They somehow found a PCM and istalled it yesterday. Nothing. Same shifting, same codes. Son of a B&*#$!

Inspect wires 129 (positive), 132 (negative), 131 (shield) at engine and trans connectors for shorting or terminal damage.


129 red wire


132 black wire


131 green wire


This is refering to codes U0073 and U0100

04dmax- You may have been right. After they tried a new PCM, then a new TCM, they found nothing. Then they decided to look into the wiring and found some faulty connections. Truck runs perfect.


Looks like they want to give me an extended warranty and some maintenance stuff for my troubles. Thanks GMhttp://www.dieselplace.com/forum/smileys/Ermm.gif

http://www.dieselplace.com/forum/uploads/331_plate.JPG

Nice plates!


The tranny trouble continues. Check engine light came on again after a few hard accellerations. It was shifting very quick and hard. I actually liked it much better than the regular shifts. Well, back to the shop it goes.

Man I hope they get it right this time!!! Let us know what pans out this time.http://www.dieselplace.com/forum/smileys/Angry.gif

I LIKE THE PART WHERE THEY SAID IT WAS GOIN TO BE JULY 3RD. I WOULDA WENT TO THE LOCAL GAS STATION TO GET A GALLON AND BURNT THE DAMN THING RT OUTSIDE THE SERVICE DEPT

Now they are saying its a fuel injection problem and are waiting on a part from Michigan. This was after they called GM cause they are completely clueless as to what the problem is.


I just recieved a letter from Chevrolet regarding my problem.


"We are sorry you continue to be dissatisfied with the decision we made concerning your 2004 Silverado. We know you are sincere in the position you have taken, and we trust we have been able to explain our point of view."


Bla blah blah BS. They go on to say that they participate in the BBB Auto Line and I should contact them as an independant dispute resolution. I think they are tired of dealing with me and are trying to push the matter off to someone else. What a bunch of $hit. http://www.dieselplace.com/forum/smileys/Angry.gif

Tell them to send somebody out who knows what the hell they are talking about. How does a tranny problem turn into fuel injection?

Good question. However, they called today for me to come pick it up. Seems to be fine again. They also changed fluid in both diffs and are going to switch the tranny over to Transynd free of cost. They are also giving me the extended warranty. I may have to blow a few trannys for them just to get evenhttp://www.dieselplace.com/forum/smileys/Evil Smile.gif

Ok, I am going on to my soap box here but bear with me. Why can't anybody step back and analyze a problem properly. Where does everybody miss out on this. A tech anylyzes with a tech 2, reads codes and calls gm for advice. Is this what they teach in diesel mech. school? Why not approach a problem logically instead of replacing random parts until whatever the problem was quits being a problem only to re-appear a few short days later. Does this not seem counter intuitive to anybody else?http://www.dieselplace.com/forum/smileys/Confused.gif