LBZ: O.s #

[Huntinducks82]

Are there any differences in the O.S numbers for the LBZs. Did they add any more tables in EFI from the old O.S#s to the new ones. Just wonderin why they would want to change them.

 

[Drholliday]

I had my truck reflashed to the newest OS at the dealer and it was to address some EGR issues. After the fact I noticed when its cold enough for high idle the truck waits longer to engage the high idle (about 3-5 minutes) then it did before (about 1 minute).

 

[Huntinducks82]

Okay Thanks

 

[x MadMAX DIESEL]

dumb question but what does O.S. stand for??

 

[Kat]

dumb question but what does O.S. stand for??

Operating system

 

[LBZ]

The latest LBZ update also changes the parameters for the tcm for the warm up cycle time. They fried a couple transmissions in the past so GM made some changes.