Hey guys, for the 2nd time on the exact same 2.5 hour drive, my 09 ESV tripped the P0700 and P0742 codes. Both times the CEL went back off on its own. Since I knew the codes were tranny related (thanks to onstar) and I was out of warranty, I took it to a local tranny shop to see what they would recommend because they offer free diagnostics and I figure they specialize in this stuff. This is my 1st time at one of these shops. Well they came back saying it could be anywhere between 2k and 3k to fix, but they would need to take the entire thing apart and the final cost would be determined then. The truck is running fine, best gas mileage we have ever had, the shop test drove it and said it seemed to run fine. My question for the board is, should I take it to the dealership (my buddy is a service writer there) and expect the same quote/explanation or would they maybe say something different? Also, if you guys are in my shoes, would you continue to drive until something happens that makes me have to get fixed, or would you just take care of it now. I don't want to do unknown damage. Other than this CEL, we love the truck and it works as expected. Thanks for the input.
P0700 and P0742
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I heard there was some kind of update for the software, I would take it to the dealer and have them tell you. Find out about the software updates
Had the tranny fail twice on our old 07 Yukon Denali XL ( high mileage and driven hard). It does not destroy the truck, had it fixed and moved on to Escalades after the second tranny.
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