P12 no read

[Chevy366]

I tried again tonight, I checked to see if it was locked and it says it is. I dont think it has ever been flashed with EFI Live before. What should i do now?

That sucks , reading seems to be iffy right now with the P12 PCMs .
I have no problem flashing a P12 just reading them .
Did someone tune it with HPTuners or some other tuning suite ?
Have you tried flashing it or just reading ?
Try doing a calibration only flash .

[JustinD]

I have just tried to read it, I want the stock file so I can save it if we ever have to go back to it. How do I do a calibration only flash?


It wasn't tuned. He bought it stock with 25,xxx miles on it, doesn't seem like anyone has ever played with it???

[JustinD]

Do I have to read the stock file first to see which OS it is running or are all 06 Trailblazers the same? I will try to flash the tune file right in but I don't want to lose the stock file.

[Chevy366]

Do I have to read the stock file first to see which OS it is running or are all 06 Trailblazers the same? I will try to flash the tune file right in but I don't want to lose the stock file.

Hmmm , I have not played around with the reading part anymore , I really don't know which of the 5 BCM fuses to pull , I suppose I could pull all 5 and see what happened but not something I really want to do .
There is a stock file on Holdencrazy.com and I have one plus the TIF updated one . Yeah , the PCM should have the same OS in the 06 year 4.2L , unless it is the EXT and has the 5.3L , then it is probably different .
I see your point in wanting to be able to read the current tune off the PCM thought , I have not heard anything more from anyone .
I did pull 2 of the 5 fuses when I tried reading last time but it still failed , so don't know who said to pull the BCM fuse .

[JustinD]

Yeah we tried the BCM fuses, there are a few of them we tried all of them and then 1 at a time, still get the same error messages.

[Chevy366]

Yeah we tried the BCM fuses, there are a few of them we tried all of them and then 1 at a time, still get the same error messages.

I know you are , but are you selecting the Atlas PCM when trying to read ?

[JustinD]

Yes P12 Atlas PCM on the drop down menu.

[Blacky]

We are still investigating this issue.
Regards
Paul

[Chevy366]

We are still investigating this issue.
Regards
Paul

Thanks for the reply .

[JustinD]

Any more info on this?