hey guys,

I recently put a HP tune on the car (BYT) .. I have the GMS1 sensors on it already. about 10days after the tune, I Popped two P0442 codes and a P2237 Code as well.. I have nothing on the car other than the GMS1 sensors and the HP tune. the read out said this exact thing for the codes: P0442 (Evap Emission Control - small leak) and the P2237 : Sensor Pumping Current Ciruit Bank 1 Sensor 1 (OLD)

So, I've followed the CEL thread and searched the P2237.. and after reading I think I'm left with one of two possibilities... either I clear the code... and press on... or a I replace the sensor and wait for it to go tets up again...

other questions I have:

Is this related to the tune? has anyone popped this code without the tunes?
Is this detramental to the car in any significant way? cause i'm still daily driving it...
what's the part number or how do I identify it to the dealer without them trying to bring it in for service and seeing I have a tune ( I'd have to write entire back to the stock tune I assume before hand)
What is DCFO again? ... engine breaking ?

by the way, I did up into the CEL threads and did read a few that BYT and a few others commented on back in March 2010... but I couldnt reply to any for some reason.... so I have been reading the other threads.. just needed to get a quick assessment

 

I would say to make sure your gascap is on right... sometimes that stupid code for the EVAP system will go off cuz the gas cap isn't on tight enough or the seal is bad... otherwise you are going to have to look at the actual evap solenoid on the intake mani... as far as the other code... I think it can be thrown if your car feels like it randomly, its like when your girlfirend is on her period and has a random outburst of emotion about something you did 5 years ago... It's an old code. Clear it and see if it comes back.



Hopefully you can see that image... I'm not sure why it's so small. The far right column is the stuff that will thrown that code... as you can see the list is long and distinguished just like the amount off ass GM has kissed in the government.

As far as DFCO (Dynamic Fuel Cut Off) that is your car saving fuel while you are decelerating

 

Thanks for the reply!.. I can tell by the numbers of people looking but not saying anything that I probably hit on something that everyone knows about and I'm like the 5,000th person to say it again (Boring!) lol.... I appreciate your response though...

I guess my big concern from reading the other threads and some of the stickys on here that that this could be an inherent "bug" in the HP tune? ( per mention from BYT SS Cobalt on another thread) so it begs the question, if there in fact is a bug.. is anyone trying to figure it out? ... cause it tells me that the BYT tune might be subtly unstable... Don't get me wrong, I've been more than happy with this tune so far... but like any good tuner, I would think they would want to work these things out so that people dont have to keep spending money on stuff like O2 sensors every 6months lol...

the other issue as it pertains to these codes is long term stability of the ECM and the overall car performance.. I kinda wondered if there are any potential issues with it.. not sure though..

I plan on clearing the code and seeing what happens with it.

again, thanks for the reply

 

oh and hey.. any reccomedations on a decent aftermarket gas cap? because I've tried tightening the stock one and I feel like its a half turn , then it clicks repeatedly.. and almost feels like it backs off to very loose again ...

 

I had the same 2237 problem when I first got tuned. What it was what the car was not going into DFCO mode, which is where the fuel is cut to the engine to save gas. Here's the exact response that byt sent me when I asked him that I forwarded to my tuner, which fixed the problem

 

Just hit up a dealership for the gas cap.

 

Have the gas cap tested... most auto parts stores have equipment to do so, or you can go to a smog check station. No sense in spending the money on something that isn't broken.

 

Good idea about the gas cap!... thanks for mentioning that... I didnt realize this could be done actually.. never had the problem before on any of my other cars..

 

Tommy P.... I will definately give that a try... Hopefully getting to that on the HP tuner Software is fairly easy to do

 

The best thing you can possibly due is get into contact with your tuner. So he or she can explain in detail what the code means and the possibilited os why they have came up.

.. If you cant get into contact with him then ure fine lol. Im just throwing it out there to the peole who read this.. But your evap code can be a crack in the line, to a failed test to the gas cap. The h02 circuit can be faulty are lnf wideband sensors are known to go out!! So is it the tunes fault? Not really, if the tune is rich enough or lean enough the 02 can get burnt up and cuse failure to it. But get into contact with Nick... He will lead you inthe direct position.. Also have him relog ure car.... And have him look into ure purge valve...

 

Yea new gas caps blow bags of 10 dicks at a time... I haven't had a newer car that hasn't thrown an evap code cuz of the gas cap... apparently I have been cursed by Ms. Cleo for talking ****. I apologized but her crazy Jamaican ass is still ******* with me.

 

Chevy I'm not sure who nick is to be honest... can you elaborate there a bit?

but your suggestions of Ho2 circuit; if its a known lnf wideband issue, I can certainly look into that.. but I'll have to do some research on it as to the location and ease of checking it to see if there are any cracks in it or not... this thing is garaged most of the time... granted, weather has gotten colder recently... so if the rubber is that sensative to temps, then its something to definately look at.

I didnt want to come out and say right away that it was the tunes fault 100%.. but I look at the coicidence of having the GMS1 for 6 months, with no issue.. and 10days after the upgrade to the HP tune, I get codes... I think anyone would wonder, especially after reading some of the stickies and threads that there "could" be a bug... I just want to solve it as logically as possible without going in 10differet directions at once... it might be OCD to say, but I'd like a step 1 check this, step 2 check that thing here lol

atleast for what I am or the HP software is capable of doing...

I just really want to know that this isnt adversly effecting the car at all... that's my big concern... I dont want a small problem to turn into a huge issue if I can help it.

 

Ummm. You said you were BYT tuned, Nick is the owner/tuner of byt. Or did you just copy one of his tunes?

 

While in theory its posible that the tune may have caused the P2237, its INCREDIBLY unlikely, that code is an electrical circuit fault code. Youve most likely got a bad sensor, or a chafed wire.

 

Usually if its tune related... you would know right away. I am just trying to ease your mind a bit on that... I am hoping you get it figured out but just try eliminating the issue by good diagnostics... #1 clear code and see if it returns (unplug battery for a while to reset the codes if you don't have tuning software), #2 if code returns, check gas cap, #3 if none of that, check the evap solenoid, #4 purge valve, #5 if its none of that, you have a crack/hole in a line or an issue with a fitting... start easy then move to something more difficult.

 

I like this... sounds very sound and straight forward... thanks for that...

as for Nick... 1+1=2 Duhhh!! lol .. my apologies my heads all over the place at the moment.. I wasnt sure if he was talking about someone in here or not. and yes that's a good idea too.. but I think before I go blowing him up... I'd like to do this other stuff first... I would want someone to know I've atleast tried to rule out the basic stuff first ... so I'm gonna follow this path and see where it leads...

thanks for all the inputs everyone.

 

Most tuners on here know the main issues the car will face. They have a real intimate knowledge of the innerworkings of the LNF and LSJ. Nick is a good dude from what I have read too, he would answer your questions and point you in the right direction pretty quick.

 

good point.. I'll definately call him once I take a look at the basics you outlined here if there are still issues in the next week or so...

one thing that wasnt answered up to this point.. was whether these codes will or can cause some major issues or are they just emissions based and won't have a huge impact on the cars drivability...

 

Codes mean somthing isn't running like it should so technically yes. But in Ure boat! .no get ahold of nick he should take care of you.

 

lol.. true... I will get ahold of him.. but I do want to see if these things I can actually put eyes on are going to answer the question before I make the call though.. Eliminate the obvious... that wasn't sooo obvious to me a few hours ago lol...

I'm still qualified as I noob I suppose..

 

here's an interesting one for you.... I started the car this morning... ambient temperature outside is about 41 degrees F... the CEL did NOT come on... I smiled.. and also had that perplexed look on my face... so I dug into the PDS and looked at the A/F window.. and it said "A/F Data not available" WTFO??

that's a new one on me!? ... any suggestions on that one?

 

maybe it did this because it was at cold start and the car runs in open loop?

Did you reset the battery right before hand or at anytime before starting it? that could also be since there is no recorded driving data on it? Im guessing at this point but contact Nick about the fuel cut off code. He really will be able to help you out. He's definately the good sumaritan like that.

The EVAP purge solonoid may need to be replaced. Its like a $20-40 part and its located right on top of the intake manifold. Mine got stuck closed I think and I kept throwing that code. Warranty work will take care of that. best way to find out if its the EVAp purge solonoid is clearing the code and seeing if it reappears during 1 driving cycle. usually if you drive for 15 mins or so it will reappear.

 

Usually it is the boost gauge not working due to a blown MAP sensor. I'm guessing the AFR has to do with the wideband O2 sensor. That is the one in the manifold, before the turbo. It isn't necessarily blown it could be that the sensor is cold, after the warmup cycle, did the AFR on the RPD come back?

 

actually yes it did.. took probably 5-10min... but it did start to send data... I drove for 15min.. code has not reappeared... but oddly enough if 2237code went away, why if there are the other codes (as it related to the possible gas cap) didnt the CEL stay on? did all of the trouble codes just miraculously fix itself? lol..

I'm gonna stick with the plan that you set out.. check some of the basics here and give nick a call anyway...

 

and thanks for the correction there... RPD.. not PDS ... ughh.... I sent that earlier message after 14hrs of being at work lol