Hi,
I went through the manual for your vehicle, and the P1054 isn't shown. I know normally that is an air/fuel code, but it isn't identified as relevant for this vehicle. Please confirm that code for me.
As far as the 77-1, that is a communication error with the PCM. Interestingly, one of the components it could be related to is the PG MFI (fuel injection) which could cause an Air/Fuel mixture. However, according to the test procedure, it could also be related to the AWD control unit. See pic 1 below
The manual indicates if there is a code related to the PG MFI system, to start diagnosing with the codes stored. Since I don't have a listing for 1054, I'm at a standstill. So, please confirm that is the code you have.
Let me know.
Joe
See pic below.
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Tuesday, July 27th, 2021 AT 9:19 PM