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Reply To: 2023 GMC 1500 6.2L engine miss

March 1, 2023 at 9:00 am #749348
sdakolios01
Participant

Welcome to the wonderful world of DFM issues. Dynamic Fuel Management uses valve lifters to disable 4 cylinders in certain situations. I experienced rough performance, engine miss firing, and rough idle. On my 2020 6.2L one lifter failed at 8,800 miles. The result was a bent pushrod and the lifters on that bank were replaced with a new, more robust design. At 33,000 miles, a more dramatic failure that resulted in the lifters on the other bank all being replaced.
You might want to search “GM DFM Issues” to determine if what you are experiencing aligns with DFM lifter failure.

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