Quote:
Originally Posted by roplusbee
Word. I hope you get it all sorted
That P1421 will not go away. You can go back to stock and then re-flash, but it WILL come back. You will either have to convince GTM to turn off that DTC or just live with it. I will be going back down to UPREV in a week or so. I will be asking about that one for myself, so I will share the results.
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I just got this code (P1421) today pulling out of the garage. Haven't driven the car all winter and still didn't drive it today. I wiped it and will see if it comes back next time I go for a drive.
Any idea what causes it?