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1st time post: I have a 2021 GMC 1500 Sierra Diesel and my check engine light recently came on. I took to local dealer and the Subject Line Op Code P2C7a was provided to me. Before I explain further, any thoughts/feedback as to the meaning of this code? Any certified emissions techs on this site that would be willing to communicate directly with me. My goal to to get additional input to confirm the servicing dealer’s tech conversation. I would greatly appreciate any/all assistance. Thank you.
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I had a similar issue on 2021 GMC Denali. 70,000 miles . The check engine light kept going on and off…took for inspection sticker and computer was saying it wasn’t ready with all the emissions check. Dealer flashed the computer it cleared the code …got inspection sticker then came back on with limited speed warning…. brought truck back to dealer and was told that a part on cooling system t hat helps cool turbo was bad …took 6 months to get part in . Gm gave me a rental for that time . It’s seems better now . Time will tell
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Thanks for the reply. I have the 1500 DuraMax Diesel. Tech is recommending replace the cat converter. He did not drive the vehicle nor do I have a print-out of the freeze frame data (data the resulted in the code). My thought is it could simply be O2 or NOx. I am hesitant to purchase a cat w/o the other options being explored. I have not experienced the limited speed/milage warning and since the code was cleared a week ago, the Check Engine Light has not come back on.
Are you aware of any online sites (independent of the OEM) where OEM certified techs give non-legal advice about what the steps/processes should be to help with the diag that the tech is giving?
Thanks again for the reply…much appreciated.
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