E38/T42 4l60E P0717 Code

Yes, weird about it being a 65E and throwing an ISS code...

Could it be in the TCM wiring? Ive heard all T42s are wired the same way, but Im pretty sure thats incorrect as 06-07 TBSSs can use the same TCM OS but 08-09s cannot. (They're 70Es, but that shouldnt matter for this argument.)

What year ECM OS are you running? Are they a matched pair (E38/T42 OSs), as in a factory option?

EDIT:
OK, so its throwing the P0717 code but it is a 65E with an ISS? (Or is the ISS part unknown at this stage?) Try changing the ISS table I mentioned a few posts ago (D7026) and killing the DTCs, but you're correct that just disabling the DTCs wont do it. I think the biggest thing is to make sure the ECM and TCM OS are a GM factory matched pair, then go from there (if they aren't already).

Quote:

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Originally Posted by ScarabEpic22

Yes, weird about it being a 65E and throwing an ISS code...

Could it be in the TCM wiring? Ive heard all T42s are wired the same way, but Im pretty sure thats incorrect as 06-07 TBSSs can use the same TCM OS but 08-09s cannot. (They're 70Es, but that shouldnt matter for this argument.)

What year ECM OS are you running? Are they a matched pair (E38/T42 OSs), as in a factory option?

EDIT:
OK, so its throwing the P0717 code but it is a 65E with an ISS? (Or is the ISS part unknown at this stage?) Try changing the ISS table I mentioned a few posts ago (D7026) and killing the DTCs, but you're correct that just disabling the DTCs wont do it. I think the biggest thing is to make sure the ECM and TCM OS are a GM factory matched pair, then go from there (if they aren't already).

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Thats the two issues. The ECM and TCM are not matched IMO. They initially setup by the company who did the harness. I get stuck coming behind them to tune the cars in person. I dont know of anything GM did with a E38 LS3 and a 4L60/5.

Post the TCM file.

This is the tune that was in it from who ever did the harness.

Ah yes, that combo only existed in trucks, Silverado 5.3/6.2 (E38) + 4L70E (T42) I think. What ECM OS is it using (Vette, Silverado, etc)?

That tune looks ok except for the ISS tables, sounds like you're going to have to talk with the builder and figure out what they want to do. Try and turn the code off or worst case, redo the engine/trans harness so you can run truck parts and a truck ECM/TCM OS.

Here is the tune that came in the ECM.

I am hoping to find a solution through tuning, because the bad thing is there is another car exactly like this one. So IF it comes down to pulling the trans then they have to disassemble two cars since they were both built alike.

Took a look at the segment numbers from both the E38 and T42 calibrations you posted. The T42 looks like it was originally based on a 2008 Yukon / Tahoe 5.3L LC9 4L65 4 x 4 - not a perfect match, but very close. The E38 appears to be based on a 2008 Sierra / Silverado 5.3L LY5 4L65 - with the exception of the system segment (12616621).

I was unable to track down the origin of the system segment. Hopefully it is simply one that I have never seen before (and don't have on file) - and not one that was swapped in, for whatever reason.


Regards,
Taz

Took a really quick look at the tunes you posted - more than a little time starved currently. Whoever set them up disabled most items you would expect in a retrofit application - but they left the ISS active.

Attached is the T42 tune with very minor changes related to the ISS - should run without setting ISS DTCs now.


Regards,
Taz

That got rid of the P0717 code. BUT now it gets to 75% throttle and thats about it most of the time. When you go WOT it will pull the TB back to 75% 9 out of 10 times. I cant figure out what is doing it, there are no codes either.

Checking in remotely ... no access to tuning software ... it may be that a torque limit is being reached, and causing the throttle reduction. Can't recall the torque settings in your ECM & TCM tunes. The forthcoming updates to the software should include an ECM torque table - which may help.


Regards,
Taz