O/D light After flashing back to stock w/ X3

[Ed C]

Just wanted to let you guys know that apparently this is still a problem even with the X3. After doing a search I found out it is a problem with the Xcal2. I reflashed it before I left (stupid me never test drove it after I did it) and just called my wife. She said the O/D light is flashing and the shifting is erratic. I sent her detailed intructions on disconnecting the battery and letting it sit , I hope that does it. I'm sure she looks like this :wacko: trying to do it . I wish I was there...



Ed

 

[Jim Luttrell]

It will. Mine always does that. I don't know why, but it works everytime.

 

[Eric Pennal]

I have a first generation XCal, and mine does that too. Disconnecting the battery, and letting the transmission re-learn your driving style seems to fix the problem.

 

[user 62851]

Mine didn't do that, with my X3 on my 04. but good luck with yours

 

[Dingo]

Mine's fine.

'07 V8, Livewire.

 

[Eric Pennal]

 

[Ed C]

Mine didn't do that, with my X3 on my 04. but good luck with yours

Yikes!

 

[Ed C]

Just in case anyone cares, the battery reset worked, the truck is fine.

 

[Tom Schindler]

I will explain this to everyone why it does this.



The 5R55E transmission has an adaptive learning strategy. In other words, the ECU learns your driving style and adjusts the transmission fluid pressures accordingly.



IMO, that is one of the negative things about the Trac and I personally feel that is part of the reason that some of the problems some members have.



When you are running a chip, XCal 1, XCal 2, Or XCal 3 the computer is trying to lower tranny pressures. At the same time, the reprogramming in the ECU is keeping the pressures higher.



Essentially, we are having a power struggle. When one of the "powers that be" "leaves", i.e. the Programmer, the learning strategy makes it shift like crap because it has tried to lower the pressures as low as it can possibly lower them.



When you unplug the battery, it will put the pressures back to the default setting before it starts to adjust for your driving style.



It will learn in time if you leave it alone, but you can be causing wear on your clutches and excess heat. Best thing to do is ALWAYS disconnect the battery after going back to stock.





Tom

 

[Derick Cardenas]

caymen: if i flashed the ecu with a perf tune, do i need to disconnect the battery?