Hi,
If it is staying in first gear, that will cause the engine RPM's to be extremely high if you are driving it. Also, if the engine is revving that high, you can damage the engine.
As far as the code you have, it is a transmission code indicating a hydraulic pressure issue. This could be a couple of things. For example, the front pump or a pressure switch. I attached a description below for you to review.
So, let's start with the basics. Is the fluid clean and full? Also, does reverse work properly?
Let me know.
Joe
See pics below.
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Thursday, July 13th, 2023 AT 8:59 PM