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chris989

03-26-2025 10:13 AM

how to read codes

Hello all,

Wife's burb,, 2002 2500, 6.0 4l80

It died yesterday,, 99% sure it is the fuel pump but before i pull the tank i want to confirm low pressure... Is there a way to cycle the key or some other combination to get the codes on the dash or a flashing sequence?

I have been searching the net for 30 minutes now and get every forum/video except chevy for my gen.. I have an 89 v2500,, a little different

Thanks in advance

chris989

03-26-2025 11:25 AM

Re: how to read codes

I went ahead and just hooked up my pressure gauge at the rail,, I have 30PSI

i read i need 50+ is that accurate?

Thank you

hatzie

03-27-2025 02:53 PM

Re: how to read codes

Quote:

Originally Posted by chris989 (Post 9377288)

I went ahead and just hooked up my pressure gauge at the rail,, I have 30PSI

i read i need 50+ is that accurate?

Thank you

The fuel pressure for an LQ4 engine should typically be between 55-62 psi at idle and under load.

30 is super low.

chris989

03-27-2025 05:51 PM

Re: how to read codes

I installed a pump from NAPA yesterday,,, all better now

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