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2013 silverado 2500 hd CNG a few questions

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  • 2013 silverado 2500 hd CNG a few questions

    I just bought a 13 silverado 2500 hd with CNG. The truck is great, i ran it on cng and it works good. My thing is im getting a u0109 code and a p069e code lost communication with fuel pump control module and fpcm request mil. My question is this. Im assuming the fuel pump module for gas is intergrated into the cng controller but im not sure is that true. Also is there a way to connect with a scan tool to the fuel system module. I have a snap on appolo scanner and it dosen't give me the option.. As of now the truck runs good on gas. The cng guage will flicker or go out completly or it will flash and orange light with 2 green lights. Shortly after that the check engine light comes on it seems like a power issue but i cant find any electrical schmatics for it.

  • #2
    I think you will find that the fuel pump module is a separate part located in left front of the engine compartment. The only option to scan the vehicle is with a GM scanner. The old Tech 2 with the last update that was done to the tool will read the 2013 Silverado CNG. They stopped writing PID's for it after the 2013 model year. A lot of independent shops still have the Tech 2 and that would be the cheapest way to see what is going on. My memory is getting a little bad but I think the truck you have uses a variable flow gasoline fuel pump that is controlled by the engine control unit. When running on CNG I think the module only fakes out the ECU to think the fuel pump is running and doing it's job when it is not. It's possible the module has failed and sending the ECU codes that the fake fuel pump isn't working correctly.

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    • #3
      Hi, I have different Silverado question. I bought a used 2013 Silverado 2500HD bi-fuel. The dealer had no clue about the CNG feature. My truck came with the owners manual, and I assumed all I would need to know would be in the manual. Boy was I wrong, there is nothing in it except how to engage the system. I've been reading online that I should change the coalescent fuel filter every 3,000 miles, but I can't find it on the truck, and even when I go to the GM parts site, I can't find a part number. I am hoping someone out there could direct me on where I could find something like a service manual or any kind of information that would tell me what parts i need to change and maintain to keep the system running correctly. Thank you very much

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      • #4
        I have found the dealer PARTS departments are best sources for exploded views of all parts and locations. (They can also print out a vehicle factory build list for your truck via the VIN).
        It is my understanding that dealers must be able to supply parts for 10 years on a vehicle.
        The filter likely would not be a stock item and need to be ordered, or if they can give you a part number, maybe find one via the Internet.
        I have the same truck, but have yet to change the filter...probably should after 50,000 miles!
        '13 Chev Silverado 2500 Ext Cab Factory Bi-Fuel
        '08 Green Tea Metallic GX
        FMQ-2-36 Fueler

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        • #5
          Sorry, I do not know where the filter is located. Maybe let us know when you find it!
          '13 Chev Silverado 2500 Ext Cab Factory Bi-Fuel
          '08 Green Tea Metallic GX
          FMQ-2-36 Fueler

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          • #6
            Thanks for the input cnguser, I will check with a local chevy dealership (who just built a brand new facility). I will post what I can find out.

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