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    Default Overdrive Tiggers, The Check Engine Light to Come On.

    Recently every time my Sierra goes into overdrive it triggers the check engine light to come on. I have plugged it into the computer at my familys garage and it's coming up evap valve. I took the valve off and blew it out with an air hose and reinstalled it and reset the code. The light stayed off for a few days until today driving back from work I passed someone and as soon as the overdrive kicked in the light came on. I am going to plug it back into the computer and see what it reads. I'm just curious if anyone else has had this issue.
    Last edited by EthanP89; 06-17-2013 at 08:01 AM.

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