Flashing different OS?

[driver456]

I have a 99 Chevy Silverado w/09379910 OS pcm.Can I full flash a different OS into it so I can use the COS#5? I have an extra 99-02 pcm just in case.I just don't remember if I could do that:unsure:.................Paul

[ScarabEpic22]

You need to be running the 02 F Body OS before you can upgade to COS5. Once you have copied all of your tables over you can full flash that OS in, then upgrade to COS5.

[driver456]

Aahhh OK.Thank you:thumb_yello:.................Paul

[driver456]

OK I did a full flash and the truck does not start.I'm getting "U1000 Class 2 data link $1A Transfer Case Shift Control Module" Now what................Paul

[GAMEOVER]

What file did you flash into PCM? Was it a truck file or a F-body file?
Find a truck file that has OS 12212156 or 12202088 so you can use the COS's....

[driver456]

OK I'll try that,Thanks................Paul

[driver456]

What file did you flash into PCM? Was it a truck file or a F-body file?
Find a truck file that has OS 12212156 or 12202088 so you can use the COS's....

Thanks man that worked.Started right up:grin: I used an 02 silverado w/12212156 OS.I also put in the BCC code.I did not do that on the last one.I don't know if that had anything to do with it.Any way's it starts.Thanks again:thumb_yello:

[GAMEOVER]

Cool....:cheers:

[joecar]

Be sure to read this.


COS5:
showthread.php?t=2599 (http://forum.efilive.com/showthread.php?t=2599)
showthread.php?t=2270 (http://forum.efilive.com/showthread.php?t=2270)


(http://forum.efilive.com/showthread.php?t=2270)

[driver456]

Well its back again,Same problem.Any idea's?

[driver456]

I had an extra 99-02 pcm.I put that in,Flashed it,The truck starts right up,But I still have that U1000 code and now the battery light came on in the message center and my fuel gauge does not work.:confused: I think I'm going to flash the original OS and leave it alone like I should have done in the 1st place:grin:

[driver456]

OK put in 0411 pcm in flashed 12212156 OS WITHOUT the COS#5 and everything works fine:grin:I took out the 5.3 motor & put in my 5.7 short block that I had left over from the Corvette,That's why I changed PCM's and OS to get away from the backup VE table and other stuff:grin:............Paul

[GAMEOVER]

So everything is good?

[driver456]

So everything is good?

Yes sir :thumb_yello: