P0757 help..

[Hideintire]

Silverado SS with RPM level 3 tranny and Circle D 3200 rpm TC, both new. Has kicked P0757 code twice. Search for P0757 issues say to turn off test in tranny diagnostic, but there is no P0757 in tranny test. There is a P0757 in engine diagnostic. Do I turn off there? Is yes or no...off? Not real explanitory.
Help would be appreciated!

[Hideintire]

Any help out there....

[400ss]

Disable that code in the tune. I think its because of yhe converter. It just happened to me. It stays in third gear . Just disable the code

[Hideintire]

Thanks 400ss....but what code?????

[400ss]

Set p0757 to not reported in engine dtc processing enable and p0751 in trans dtc fault processing enablers

[400ss]

P0751 to " NO"

[Hideintire]

Thank you 400ss! If I might ask...I'm having low idle issues and would appreciate some help. 04 SS basically stock except shorty headers and true duals. Thought it was a dirty TB, but cleaned it good and no change...honestly it is worse! MAF was also cleaned, but that was about three weeks ago...before the problems started!
This problem seemed to begin after I downloaded the tune and added electric fans. Best I can tell...only the fan info changed...but the truck has run worse since and the mileage is down 1 mpg!!! The P0757 code is more pronounced since I changed the tune for efans, as well. Could there have been a mail-order tune on truck that EFILive did not read? It seemed to download properly...but something has changed! Any help would be greatly appreciated!!!!
Thanks,
Jimmy

[400ss]

With v7.5 compare your tune with a stock one . This way youll knof if it hasbeen modified

[Hideintire]

Thanks...I did and it looked stock. Just wondering why all the issues since adding fans.

[400ss]

The problem is when the fans turn on??

[Hideintire]

I had not thought about that...but it may be. Idle is fine when cold.

[Hideintire]

Thanks 400ss....you made me think through things and I appreciate it! When I loaded Efan tune, the computer lost its relearn of the dirty TB. Thinking it might be the TB causing the low idle, (BTW the throttle body was filthy...it did not look as if it had ever been cleaned) when I cleaned it, I did not think to reboot ECM and I had a terrible mess! So your note got me thinking. Also, I altered my tune as you suggested and loaded it. Time will tell but hopefully the DTC will stay gone.
Thanks!