Installed Yeti DTC delete but still getting egr code

Mountainman · **Posted:** Sat Feb 15, 2020 5:50 pm

Anytime

So, you've had two jeeps with that same problem right? I have used that particular tune a time or two, with no such problem. I'm thinking that your copy is corrupted. I would try getting a new copy from the diy thread and try that. If you still have the problem. I would get yet another copy, with a different mpps cable and software. Or, better yet, if the file isn't corrupt, the there's, however unlikely:

Use a different:
-The mpps cable (bad ones reported on lostjeeps)
-Copy of the 808 tune
-computer (if available, or a really cheap laptop from a used place)
-And let's not forget the mpps program. Try downloading from a different source if possible.

-you should be able to avoid the Yeti route if you have this on 2 seperate jeeps, as this is the first report of this problem (I believe).

Something is causing you to "lose" a 1 or zero in the file...
Unless its hexadecimal code, whatever lol

mass-hole · **Posted:** Sun Feb 23, 2020 12:28 pm

Its possible that tune does not turn off the EGR/FCV codes, it simply turns off the egr function. Once it is unplugged it still recognizes it as missing. I can check and see at some point when I get a few minutes.

norm1001 · **Joined:** Mon Sep 11, 2017 9:19 pm **Posts:** 13

I figured out why it is setting the abs code, when I programmed the ecm it used a different VIN number than the vehicle. How do I change vin in the code?

mass-hole · **Posted:** Tue Feb 25, 2020 6:38 pm

norm1001 wrote:

I figured out why it is setting the abs code, when I programmed the ecm it used a different VIN number than the vehicle. How do I change vin in the code?

The MPPS cannot change the VIN in the ECM. Did you flash an 808 tune to the 2005?

norm1001 · **Joined:** Mon Sep 11, 2017 9:19 pm **Posts:** 13

Yes, Same 808 but i downloaded them at different times, and i used 2 different computers, the abs module indicates it is a VIN conflict. Thanks, Norm

mass-hole · **Posted:** Tue Feb 25, 2020 8:55 pm

norm1001 wrote:

Yes, Same 808 but i downloaded them at different times, and i used 2 different computers, the abs module indicates it is a VIN conflict. Thanks, Norm

The issue is that the 2005 does not use the 808 file. 2005 jeeps have a different abs system in that they only have a single speed sensor in the rear axle while the 2006’s(which is what the 808 file is from) has two speed sensors. Thats probably where the conflict is coming from.

Im honestly surprised the 808 file even functions at all on a 2005.

Mountainman · **Posted:** Wed Feb 26, 2020 1:12 am

Wow, I didn't catch that.
Ok, so the next question is do you have the original file from your ecu?
Are you familiar with opening the file in wordpad?
If not we can tell you which tunes to try. With any luck you won't freeze up the ecu in the process.

kidjedi · **Posted:** Sun Aug 23, 2026 5:02 pm

This thread came up for me in a search, because oddly enough (or maybe not), I'm also experiencing U0121 & P0403 at the same time.

ABS is a beast of it's own. I've pulled the ABS connector at the module under the hood (clean with continuity and power everywhere). I've checked every related fuse under the hood and inside the vehicle. All the wheel sensors look good, but I've got a set of four new ones arriving Thursday to swap them all out (mine is a 2006, so I have sensors at all four wheels instead of the shared one at the rear diff like the 2005). There are so many threads posted on this ABS (all the dash lights) issue, and so many different reasons for it to happen. Hopefully someday I'll get it figured out!

For the P0403... last timing belt change I did a physical EGR delete. I'm using Yeti's 808 stock EGR/FCV delete tune (had been using it before the physical delete as well), but before the physical delete I didn't get a CEL or any code being thrown. Now I'm getting the P0403 code. I will try to post back if I figure out what's going on with the EGR code and the physical delete.

WWDiesel · **Posted:** Sun Aug 23, 2026 10:49 pm

Make sure none of your no longer used / disconnected EGR connectors have shorted out to ground anywhere.
Contact Yeti via PM message or email and ask for his advice on this issue. He may can help you!
Use the message and / or email buttons on this forum.

You can also contact him over on his Facebook page @https://www.facebook.com/YetiChiptuning

Installed Yeti DTC delete but still getting egr code

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