My wife's 97 Grand Caravan with 112K miles stalled today during a heavy rainstorm. By the time I got to her she had it restarted. I figured that the serpentine belt came off again like it did several rainstorms before and had her drive home quickly to prevent draining the battery. To my surprise the belt was not off, so I checked for codes: 12 54 34 55

I know 12 and 55 but need to know 54 and 34.

Appreciate the help.