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I'm getting this code with no check engine light but the truck does not idle as well as it used to. That is the only symptom. P602 is a programming issue with the ECM. Any ideas?

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Smarty... It's causing the error code... If you reset to stock and clear the codes you'll be fine... But as soon as you run a Smarty program the error will show up... Of course because you modifying the stock fueling tables in the ECM and the checksum doesn't match any longer...

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So do you suggest this may not be causing the odd idle? Im considering putting in newer injectors with the hopes it will take care of the minor idle issue. And I did try that but nothing changed. I had problems with my smarty at one time which is probably why. I got stuck in a tune.

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