Question about Chevrolet C2500

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Hello, I have a 1996 Chevrolet C2500 heavy duty with 5.0 V8 Check engine light is on with -code po172 engine bank one too rich -code po175 engine bank two too rich I need to diagnose and correct problem so it will pass smog test.

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  • bellis46 Apr 24, 2010

    Can you you describe what MAF and G/sPIDs stand for?

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P0175 fuel system rich, at limit (bank 2)
You need to take a look at the trucks repair history, when was the last tune-up. If the ECM is noticing that the oxygen levels are too low that could be fouled plugs, bad wires, valves not seating, timing off, fuel injectors not spraying correctly, a problem with the fuel pressure reg May me leaking at the seal).Or you could have a faulty 02 sensor.

Posted on Apr 25, 2010

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Basically your codes are telling you that it cannot control the fuel delivery any longer.

our primary suspect would be the fuel pressure regulator
check fuel pressure and injector pulse width

however, I have also seen MAF cause a similar concern.
you need to confirm the G/s PIDs are within specifications

without some experience you may end up replacing more parts than needed


keep me posted and let me know if I can be of any further assistance

Posted on Apr 24, 2010

  • Sean Reisdorf
    Sean Reisdorf Apr 25, 2010

    sure...sorry about that

    the MAF is the Mass Air Flow sensor and the data in which it uses is in Grams per Second and is seen with a scanner through the DLC (Data Link Connector)


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1 Answer

Trouble code PO172


Code 172 means the fuel mix is too rich on bank one. If you have a 6 cyl engine there is only one bank of cylinders. The problem could be the O2 sensor or a leaking injector among other things.

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