Hi,
Basically, if the grill shutter fails, it should set a diagnostic code. Have you scanned the can-bus? CAN stands for controller area network. Basically, this will identify codes regardless of the module storing them.
Here is a link that explains how this is done:
https://www.2carpros.com/articles/can-scan-controller-area-network-easy
In this case, you may be able to get away with a traditional scan tool because the shitter actuator should signal the PCM of issues. Once we get a code, we can focus on the specifics.
There is one thing I would like you to check. See if fuse 12 in the battery junction box is good and has power to and from it. Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
I have multiple diagnostics for the shutter, but I'm not sure which would help. If I send all of them, it will be completely overwhelming.
Let me know.
Joe
See pic below for fuse location.
Image (Click to make bigger)
Thursday, June 2nd, 2022 AT 7:56 PM