Diagnostics codes PO175 & PO172 - 2010 GMC Sierra 1500

it's not a letter o (oh), it is a number zero (0)

All available on Google and better to include 'year make model'

So

year make model P0193

Diagnostic Trouble Code (DTC) P0193 stands for "Fuel Rail Pressure Sensor "A" Circuit High." It is logged when the PCM perceives that the signal from the fuel rail pressure sensor exceeds the calibrated limit over a specified amount of time.Aug. 24, 2021

P0193 Code: Fuel Rail Pressure Sensor "A" Circuit High

P0175 OBD-II Trouble Code: P0175 System Too Rich (Bank 2)

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P0175 indicates that the Engine Control Module (ECM) detects too much fuel and not enough oxygen in the air fuel ratio (AFR). This code will set when the ECM ...

P0172 OBD-II Trouble Code: System Too Rich (Bank 1)

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P0172 indicates that there is too much gasoline being detected in the exhaust gases exiting the combustion chamber. The ECU uses a number of instruments, such ...

Can be multi reasons search the codes and will have multi sites that give reasons and solutions for the problem --some reasons - dirty air flow sensor -failed or failing O2 sensor-injectors- fuel regulator- vacuum leak- coolant system/ sensor - needs tune up ect.

https://www.obd-codes.com/p0172

P0172 and P0175 OBD II Trouble Codes

Code 300 is for a random miss.
172 and 175 are for the same problem - 172 is for a rich fuel mixture bank one and 175 is for the fuel mixture too rich on bank two.
Code 143 is for a rich mixture for sensor number 3.
All of the codes could be connected to a leaking injector or other fuel problem. Very seldom are all of the O2 sensors faulty at the same time.

easy one.. when ever you have codes and want to know what they are..visit.. www.bestdirectorysolutions.com on the home page.. left side, scroll down and click on trouble codes... good luck sir

PO172 Bank 1 system too rich.PO175 Bank 2 system too rich. The tps may be bad. or the MAP sensor. They both control the fuel system.

This is one problem code P0351....
Below is code P1181

These codes mean system too rich, meaning too much fuel while running, I would check the vacuum lines and then clean the Mass Air Flow sensor (MAF), it should be located in line with the air intake tube from the air filter. Be careful not to damage the sensors internal components (use electrical cleaner or brake cleaner), and make sure it is dry before re-installation. Hope this helps, let me know.

Changed the air filter lately? Possibly defective O2 sensors, but I doubt it. If air filter and intake are clear, I'd check barometric pressure sensor and mass air flow sensors. Get a Haynes or Chilton's for $25 at Pep Boys for instructions on testing these componenets

If the fuel pressure was low enough to give lean codes then u would have a loss of power that you would easily notice, you say you checked for vacuum leaks, did you use a can of carb spray or a bottle of propane? it only takes a very small leak to trigger the codes, spray carb spray around the intake area, see if the engine sound changes, this will indicate a leak,