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Reply To: 2021 GMC 1500 Sierra Diesel: Code P2C7a

#823842
1dug
Participant

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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