Hi and thanks for using 2CarPros.com.
Here is the definition of a P0191:
P0191 - Fuel Rail Pressure Sensor A Circuit Range/Performance
This code can be set for several different reasons. However fuel pressure seems to be the most common. Picture 1 indicates possible causes.
The first thing I would recommend checking is fuel pump pressure. Here is a link that gives general directions for checking. This general test discusses pump pressure as well as the fuel pressure regulator.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Next is code P1233 Here is the definition:
P1233 - Fuel Pump Driver Module Disabled Or Off Line
Picture 2 indicates possible issues.
I have access to pinpoint data information. However, it is several pages long. Without knowing the symptoms, it is like looking for a needle in hay stack. Sorry for the cliche. Also, it is quite involved.
I hope this information is helpful. Please let me know if you have other questions or need additional help. Also, as you can see, the two codes are related. I feel once the 1233 is fixed, the other issue will go away.
Take care,
Joe
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Tuesday, July 31st, 2018 AT 8:36 PM