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Anyone experience a p1421 code after UPREV tune

Basically title is my question, also related to the code it says its cold start idle control? the Z once in awhile idles high for a couple seconds then goes

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Old 09-16-2019, 07:44 AM   #1 (permalink)
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Default Anyone experience a p1421 code after UPREV tune

Basically title is my question, also related to the code it says its cold start idle control? the Z once in awhile idles high for a couple seconds then goes to normal at start up im assuming the code is causing the idle issues I tried searching and couldn't find an answer or solution on this, just wondering if anyone else has had this come up and if they have found a solution, thanks!

Last edited by Da370z; 09-16-2019 at 08:26 AM. Reason: explaining code
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Old 10-26-2019, 10:04 PM   #2 (permalink)
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I just had this same issue and my tuner had to disable simple timing in uprev in order for my Z to run correctly, I’m not sure what it is but my early production Z doesn’t seem to like any of the newer features of uprev
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Old 12-28-2019, 07:14 PM   #3 (permalink)
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I worked with uprev to correct the issue, as long as you have the very latest ROM the issue should be resolved now
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