P00C8 and P0090 Tahoe 2017

[ipkiss]

Hello everyone,

I am in Paris and the proud owner of a 2017 TAHOE Premier Edition (5.3L).

I have been having some issues for a while now, with quite a few error codes.

After doing some research, I replaced 8 spark plugs, 8 spark plug wires, 2 coils, and all the injectors.

Despite all this, I would like to resolve the following two errors: P0090 and P00C8.

What should I do? I tested the resistance of the high-pressure fuel sensor and found 2 ohms (I hope I recorded the information correctly). What do you think the next step should be? And what is the most comprehensive OBDII software?

Thank you very much.

 

[Fless]

Some owners have found a harness that's been rubbed through. Take a look at this thread to see if it helps:

2018 sierra 5.3l P00C8 and P0090

My dads '18 Sierra 5.3l randomly started throwing P00C8 and P0090. open circuit in high pressure fuel pump actuator high control circuit and fuel pressure regulator control circuit open. Truck went into limp mode, he babied it home. Hooked the scanner up and deleted the codes, truck drove fine...

www.silveradosierra.com

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

Dr. Google offers the following on your two trouble codes, and they appear to be in the electromechanical domain. I recommend starting here and see where it takes you.

The GM P00C8 trouble code indicates a problem with the fuel pressure regulator solenoid supply voltage control circuit, meaning there is an open circuit or voltage issue. This is often caused by a faulty fuel pressure regulator solenoid (also known as a high-pressure fuel pump actuator), a wiring problem, or a faulty fuel pump. Troubleshooting involves inspecting the wiring for damage or corrosion, checking for internal pump issues, and verifying voltage and resistance readings at the solenoid.

The GM trouble code P0090 indicates a problem with the Fuel Pressure Regulator 1 Control Circuit. This means the engine computer (PCM) has detected an issue with the control circuit for the fuel pressure regulator, such as a short, open, or other electrical problem. Symptoms can include a no-start condition, poor acceleration, and the illumination of the check engine light.

 

[ipkiss]

Some owners have found a harness that's been rubbed through. Take a look at this thread to see if it helps:

2018 sierra 5.3l P00C8 and P0090

My dads '18 Sierra 5.3l randomly started throwing P00C8 and P0090. open circuit in high pressure fuel pump actuator high control circuit and fuel pressure regulator control circuit open. Truck went into limp mode, he babied it home. Hooked the scanner up and deleted the codes, truck drove fine...

www.silveradosierra.com

Thank you very much
The pics of the car…(my baby)

 

[ipkiss]

Hello, I give you somme news.
I'll turn crazy, I va changed the high pressure sensor and the fuel rail solenoid.
Result :
P0300 - Random or multiple misfires
P050D - Cold start rough idle issue
P0090 - Fuel Pressure Regulator 1 Control Circuit/Open has been detected
P00C8 - Fuel Pressure Regulator Solenoid Supply Voltage Control Circuit/Open has been detected

I really don't know what to do...