code po 496
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
Any tuner can disable the code if you just want it gone.
There's really not much of anything that I can think of relating to evap that can be changed in the tune though.
There's really not much of anything that I can think of relating to evap that can be changed in the tune though.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
i understand that, but if there is a problem somewhere, may be it should be addressed. if there is a constant ground in the ECM it may cause future issues. i dunno about lectronic chit
Race Director
Joined: Dec 2013
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As for bad ECM after it has been reflashed to OEM, I would pull the connectors from the ECM, and double check for one of the control wires being grounded instead. Hence not sure if dealer tech when this far, but would be wise move before just replacing a ECM, and still having the problem.
Last edited by Dano523; May 17, 2016 at 09:18 PM.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
Have the turner flash back in the stock tune for about a week and see if you still get the same problem. If the tuner does not have the stock tuned saved to flash it back over, then it's not hard to flash the OEM tune back in with a tech II/ MID.
As for bad ECM after it has been reflashed to OEM, I would pull the connectors from the ECM, and double check for one of the control wires being grounded instead. Hence not sure if dealer tech when this far, but would be wise move before just replacing a ECM, and still having the problem.
As for bad ECM after it has been reflashed to OEM, I would pull the connectors from the ECM, and double check for one of the control wires being grounded instead. Hence not sure if dealer tech when this far, but would be wise move before just replacing a ECM, and still having the problem.
thank you for your input.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
guess it turns out, ecm is bad 
. tuner reflashed the ecm and code still came back, so he deleted code and turned off the light, and leave my solenoid unplugged, worked for a 2 days, then i get a new code, 445 i think it was, massive evap leak, so i delete the code and plug solenoid back in, hasn t came back on in a day, so we wait and see, but i guess it is inevitable i need to replace ecm.
. tuner reflashed the ecm and code still came back, so he deleted code and turned off the light, and leave my solenoid unplugged, worked for a 2 days, then i get a new code, 445 i think it was, massive evap leak, so i delete the code and plug solenoid back in, hasn t came back on in a day, so we wait and see, but i guess it is inevitable i need to replace ecm.
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
You/he can keep deleting codes if needed (if any other relative pop up). I don't totally believe the ECM is bad, but don't know enough about the evap system to say what else it could possibly be. I'd do what you're doing and just get rid of the codes for the time being.
Last edited by schpenxel; May 23, 2016 at 10:36 PM.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,887
Likes: 981
From: Whitby Ont.
You/he can keep deleting codes if needed (if any other relative pop up). I don't totally believe the ECM is bad, but don't know enough about the evap system to say what else it could possibly be. I'd do what you're doing and just get rid of the codes for the time being.
Yes. Thanks for the input. The gm tech with his tech 2 says same, bare wire or evap, did his tests and still had it when evap upplugged from harness. I will just keep deleting if they come back. I replace ecm and same situatiin, then i am really not happy. So...
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