Hi,
The code is related to an issue with the idle air control valve. I'm not sure, but I don't feel that would cause it to go into limp mode. I would think it would cause idling issues or rough running issues.
When you say limp mode, do you mean the transmission isn't shifting, the engine loses power, or is something different happening?
What I've done is attached the diagnostics related to the code you have. The attachments contain a description of the code, things that could cause it, and what to check. Take a look through this and let me know if you are comfortable doing it and if you have any questions.
Take care,
Joe
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Thursday, October 7th, 2021 AT 7:36 PM