copper, what will this trans flash do for shifting, mpg, etc?copperbeech said:Today while at the dealership I had them flash the transmission with this update identified as P10103 or ID# 2450040. It applies to 2009 Traverse (Acadia, Enclaves and Outlooks). It was released 04/22/10.
I think I know what you mean, but I'm a little confused. You say it doesn't hunt for a higher gear now with the reflash, and so it stays in lower gears longer causing higher RPM's? Am I understanding this right? I would like to hear more comparisons between the non-flashed 09 (what I have now), and the flashed 09. Mileage is somewhat a concern, but not the most important for me. What I don't like is when I want to slow down, when I get my foot almost off the gas completely, it will act almost like I put it in N or put the brake on, then I have to push down again, which causes a downshift and speeds me up more than if I had not done anything. (speaking about when speed zones change, or other traffic is moving slower). Also, when starting up from a stoplight behind traffic, it starts moving forward right after I get off the brake, but if I have to let up on the gas just a little, it dies right down and stops creeping forward, causing me to push on the gas again more, and going too fast behind the car in front of me. I've learned to adjust for this, but just curious if the reflash takes care of these two issues.DaveD said:I had that software update applied to my 09 Traverse in early summer - same caveat was given of reduced mileage.
The shift points are much better now - it doesn't hunt for a higher gear all the time causing the high-RPMs. My mileage did go down a little, but overall it behaves much better than before.
I *just* got this flash late this afternoon so I for sure haven't had time to feel the difference(s) as compared to the OEM transmission software but I would think that if one did mostly HWY miles than you would see less of a hit in terms of gas mileage i.e. at prolonged HWY speed you will quickly move to 6th gear as expected regardless of the software.09Enclave said:Mileage is somewhat a concern, but not the most important for me.
The "file" is in their TSB's .... technical service bulletins. Tell them you need the transmission shift "update" performed due to mushy/sloppy shifts.Gibby said:When I go to the dealership how do I get them to do this? Where do they get the flash file from?
I'm sure they wont know what I am talking about!
That was the case Bob for the dealership closest to me but the dealership from which I had purchased the Traverse had no problem performing the update with no questions asked.bobg1951chevy said:Copperbeech stated they wanted to test drive his vehicle to determine the need for update.
I wouldn't want it to upshift quicker, it does that too soon already, my opinion. As for the "lugging" I don't have this problem, it's very responsive when I get my foot in it, it does what I want, it's just a little too touchy when I just want a little more gas. Has anyone verified, or heard anything firm about the "fact" that these transmissions "learn" driving behavior when the vehicle is new, or when the reflash has been done? I've heard this, but then seems that I also heard that's not true.bobg1951chevy said:When my update was done, the tranny upshifted quicker, but also downshifted quicker ...... by downshifting quicker, it prevented the vehicle from "lugging".
Example; Mine would go into 2nd gear, then hang and hang and hang before shifting into 3rd. Each gear would act much the same in lower speed conditions. This kept RPM's up higher, chewed more gas. Now it shifts quicker through the gears, it is more sensitive to downshifts when I want the downshift. I have "heard" about the transmission learning process, have nothing to document it, though.09Enclave said:I wouldn't want it to upshift quicker, it does that too soon already, my opinion. As for the "lugging" I don't have this problem, it's very responsive when I get my foot in it, it does what I want, it's just a little too touchy when I just want a little more gas. Has anyone verified, or heard anything firm about the "fact" that these transmissions "learn" driving behavior when the vehicle is new, or when the reflash has been done? I've heard this, but then seems that I also heard that's not true.