Reprogramming For Stock Tune

pa32mays · July 30, 2009

I have just purchased a 20003 GMC Yukon XL Denali and I think it acts as if it has a programmer in it. I don't know what it is or if I should be running premium fuel and what not. I would like to get the programming back to stock so I know what I am dealing with. Could someone tell me how I need to do this. Is there a way around going to the dealer for this. Thanks.

GARB55 · July 30, 2009

I have just purchased a 20003 GMC Yukon XL Denali and I think it acts as if it has a programmer in it. I don't know what it is or if I should be running premium fuel and what not. I would like to get the programming back to stock so I know what I am dealing with. Could someone tell me how I need to do this. Is there a way around going to the dealer for this. Thanks.

You can try aned disconnect your battery for around 10 min or so. So say longer 30 min some say less if you have not tried that aleady? What is the truck doing?

Draenor · July 30, 2009

I have just purchased a 20003 GMC Yukon XL Denali and I think it acts as if it has a programmer in it.

Wow, How do I get one?

The only way to really do it is to get it re-flashed, especially if the tune is password protected.

nbscanuck · July 30, 2009

disconnecting the battery just resets the learning, it doesn't reset the entire ECM program.

Stylous · July 30, 2009

Try and ask your dealer if they'll do it for free.

My friend got an '06 Silvy and when they did the oil change he asked of they could flash it back to stock and they did...for free.

They may have done it for free for him because he was still under warranty. May be worth a shot though. I think either way you need them to take a look at it to tell you what was done. Either way your gonna have to pay for that hour of labor.

fbachman · July 30, 2009

Another option would be finding a good independent repair shop (ASE shop, etc.) that has a Tech II available. They would most certainly re-flash your truck to get back to stock programming.

Naturally, there would be a charge...no clue how many hours (or fractions thereof) the book calls for on that.

I have heard the dealers being all over the map on that on in terms of cost. One may do it as a courtesy if you have a good relatioship with them. I have heard stories of dealers trying to charge 3 hours for that, which, of course, seems outrageous to me....

Edit: Did you buy your truck from a dealer? If so, I believe there is a law(?) indicating that dealers can not sell a used car that has its emmissions system altered(?). I seem to have heard that at some point. A tune, most likely, alters emmissions. Maybe a trip back there, telling them you suspect it had a tune on it when you bought it, may get you a re-flash?

pa32mays · July 31, 2009

I know where I can get my hands on a TechII. Would the tune be included in it? I need to get it because my Autoride is non responsive either.

Jennabear · July 31, 2009

If you do go to a shop with a Tech II/Tuning software, make sure they have the GM streams so you can have the most up to date GM stock tune on your PCM. It is a service you have to pay for and not all tuners have it...