P2099 Historic Not Clearing
Thread Starter
On The Tree
Joined: Oct 2015
Posts: 113
Likes: 45
From: Maryland
P2099 Historic Not Clearing I have a 2015 Z28 LS7 with heads, cam, exhaust. The original tuner was lazy and didnt turn off the SES for some of the codes, only the reporting. I have a historic code of P2099 Post Cat fuel trim too rich bank 2. Its been months and thousands of miles (about 4000) and it just wont go away. I know it take 40 cycles to clear, but my cold starts are just rich as hell and 2 tuners so far have failed to fix it. I need this code to go away so my O2 sensor readiness will complete out and I can get my emissions scan done here in Southern MD. What can I do to get rid of this damn code??? I have hptuners, I just dont know how to use it very well.
Thread Starter
On The Tree
Joined: Oct 2015
Posts: 113
Likes: 45
From: Maryland
Permanent DTCs and VCM Scanner
What is a Permanent DTC?
Starting in 2009/2010 MY, vehicles now store emission related DTCs as Permanent DTCs. Unlike non-Permanent DTCs, Permanent DTCs can not be cleared by any conventional method like a battery disconnect or via any scan tool. Permanent DTCs will only clear automatically after the module storing the DTC, sees that the problem causing the code has been solved.
Please Note: It may take a few drive cycles for the DTC to clear if the issue causing the DTC is fixed. If the issue causing the DTC is never fixed, the Permanent DTC will never clear.
What does this mean for VCM Scanner?
With the release of VCM Suite 3.0 earlier this year, we have strived to make VCM Scanner the most comprehensive scan tool available and to report as much information as possible to you. This includes reporting Permanent DTCs. All versions of VCM Suite 3.0 or newer will report Permanent DTCs, but like stated above, they can not be cleared by any scan tool, including VCM Scanner. If you see Permanent DTCs being reported in VCM Scanner, it is not a bug, the module storing the DTC just hasn't cleared it yet.
Thread Starter
On The Tree
Joined: Oct 2015
Posts: 113
Likes: 45
From: Maryland
I understand that. So what do i do to get it to clear?? Have it tuned better? Why is it going rich in the first place? It only has trouble on cold starts with fueling as far as i can tell. It burns the eyes and stumbles a lot
Yes, it has to be tuned properly for it to clear. Unless you have some sort of actual hardware issue with bad parts causing it to run rich when cold, which is highly unlikely, but possible.
