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2011 Silverado 1500 p219a tc

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  • 2011 Silverado 1500 p219a tc

    Get a p219a code while on cng may run fine 100 miles or so then comes on. No codes on gas ever. Any ideas? Also does my truck have a filter on the low side I've changed the hp filter?

  • #2
    Welcome to CNGchat.

    I'm assuming this is an aftermarket dual-fuel conversion, blending CNG into diesel by way of fumigation of the intake manifold? If so a P219A OBD code when running in this mode is not surprising, as the engine and control system was designed for precise gasoline fuel injection per cylinder and now the BTU content & air mixture is all over the place from one cylinder to another. You may want to contact the conversion company to see if they have any suggestions about this, and if there is a low pressure filter installed.