All 2021 Chevrolet Silverados GMC Sierra, both the 2500 HD and 3500 HD, have software issues that are causing the check engine light to come on. The code is a P11D5 but there are no obvious exhaust or knock issues. This may be caused by software admirality. Jim and engineers are aware of the problem and are currently working on the solution. Just please clear the code and apologize to the customer!
Update from Oct 20, 2021: After Software update never had this issue again.
A D V E R T I S E M E N T S
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All 2021 Chevrolet Silverados GMC Sierra, both the 2500 HD and 3500 HD, have software issues that are causing the check engine light to come on. The code is a P11D5 but there are no obvious exhaust or knock issues. This may be caused by software admirality. Jim and engineers are aware of the problem and are currently working on the solution. Just please clear the code and apologize to the customer!
Update from Oct 20, 2021: After Software update never had this issue again.
- Roger S., Mount Orab, US