2009 4x4 (T-SB-0373-09) & VSC disable issue

I recently had my ECM recalibrated / reflashed using T-SB-0373-09 (Transmission TSB dated Nov 3 rd.)

Well now it's not possible to disable VSC in 4WD-HI.

I used to be able to hold in the "VSC diable button" for 3 seconds while in park--now it does not work!

I think this may be an unintended side affect of the ECM reflash. Can some of you guys with the 2009 4x4's confirm this for me?

UPDATE: 12/23/2009 My problem has been solved.

I confirm that my problem existed... Took my tuck to the dealer for diagnostics... My truck sat for a day... The SA said the tech did nothing. When I picked up my truck the problem was gone. I have tested the VSC disable switch while in 4WD-HI and the problem is indeed gone. Chalk one up to PFM.

 

I just went out to my truck and started it up and put it into 4HI. Then I pressed and held in the VSC button. The light came on in the dash saying that it was off. Then I put it into drive without issue. I had the reflash done last monday.

 

Thank you for doing that! I can't imagine why mine would be any different if they did the same exact reflash. I had the service advisor print the TSB so I know they had the right one. I am very concerned about this.

 

Did the reflash make a difference in the shifting issue or not?

 

As far as I can tell yes. I still think mine downshifts prematurely at times but I don't have that hesitation where it's searching for gears anymore.

 

I tried it out as well and had the same experience as dexterdog. Doesn't seem to be a problem for me.

 

After the reflash I noticed an immediate improvement during the 2-1 downshift. i.e. Slowing down to roll over speed bumps and then accelerating is much improved. My truck never had an issue with hunting for gears that others have reported, only the harsh 2-1 downshift.

I was messing around on some trails six days ago when I noticed I couldn't disable the VSC in 4WD-HI. I was in the extreme backcountry, and I had nobody to communicate with to test this until now.

 

Thanks for testing this and reporting it here +Reps sent.

 

So the Auto trannys are having problems as well for 09? whats the deal? manuals with revs hanging and autos shift hesitation/problems? My father has a 09 with the auto and hasn't said anything, maybe he is just getting too old to notice..lol

 

My truck appears to be having a unique problem. I'll make an appointment to have it examined and report back here what happened.

Thanks again to Dexterdog and NMG for testing and reporting.