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Duramax 6.6L
July 19th, 2009, 10:23 AM
Does anyone know if there is some sort of traction control hidden in the ECM or TCM?

I have been fighting a problem that has me pulling my hair out.

If I load the truck and come out of the hole spinning the rear tires, the truck will excellerate and fall flat on its face, Shift gears to second and then excellerates the rest of the run with out any problems.

If I roll into the throttle with out breaking the tires loose, the truck will go through the rest of the run without any problems.

At first I was looking at a defuel problem, but from what I can see that is not the problem.

Any help would be really appreciated, and if you could give tables to look at would be helpful also.

bballer182
July 19th, 2009, 10:59 AM
Take a look at D5197 in the TCM. Be careful though you will hurt the tranny. It is defuel problem.

Duramax 6.6L
July 19th, 2009, 11:32 AM
I have looked at that table, I have it disabled and both values set to 0.

I saw in another forum that there is an updated trans calibration, I looked at all of them, I think 10 updates, none of the TSB's refer to this problem.

bballer182
July 19th, 2009, 11:53 AM
hmmm... really sounds a lot like shift de-fuel

Jasondt2001
July 19th, 2009, 12:54 PM
Check out this thread... http://www.dieselplace.com/forum/showthread.php?t=305271&highlight=de-fuel

Sorry, i just thought I had read in there that he figured it out - i guess not... You can still read through, might help, might not though...

Jasondt2001
July 19th, 2009, 01:10 PM
Here's another one that didn't say if it helped or not, maybe it'll point you in the right direction though.. http://www.dieselplace.com/forum/showthread.php?t=264640&highlight=de-fuel

tinman22
July 21st, 2009, 01:39 PM
actually there is a traction control on the lbz but if I remember correctly it says in the manual that yo uhave to have the shifter in M and set to "2" for it to be active.

LBZoom
July 31st, 2009, 12:35 AM
Perhaps use the Brake Torque managenment tables to limit just enough to keep you from spinning the tires so that you still get optimal take off...when the wheels are spinning and suddenly they catch, that's gonna put a pretty good load on that engine for a second too which only increases the problem. My truck will do the same thing to some extent, but if I take off spinning like you say my truck de-fuels to shift into second but when it hits second it'll still keep spinning so I don't know that it's falling on it's face as yours seems to be...I'm not sure

bballer182
July 31st, 2009, 11:43 AM
actually there is a traction control on the lbz but if I remember correctly it says in the manual that yo uhave to have the shifter in M and set to "2" for it to be active.

Yeah i've tried that and it still starts out in 1st... Whatever.... My traction control is my right foot.

JoshH
August 2nd, 2009, 02:45 AM
What is your rev limiter set to?

tinman22
August 3rd, 2009, 01:59 PM
yes its still going to start in first. but according to the manual thats how you activate the traction control. although it seems to function even if your just in drive.

serpa4
August 16th, 2009, 09:55 AM
I'd say rev limiter. Had same problem of falling on its face for 1/2 shift and rest were fine. Had this issue for 1 year before upping rev limiters NOT raising shift points. Still shifts at stock 3200 ish, in manual, will rev over 4,000.