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This code means the catalytic converter is failing or has failed. You can try a burn off procedure to clean it out but if that doesn't help it will need to be replaced. To do burn out procedure disconnect a spark plug or coil to disable one cylinder then hold rpm at 3000 for 5 minutes. The unburned fuel from disabled cylinder will go into converter and burn out debris. Let me know if you have more questions or if there is anything else I can do to help. Thanks.
What year, model, make, and engine size of truck?
Does vehicle seem to run fine or run rough? When is last time spark plugs were replaced?
I'd start with burn out procedure and replace spark plugs. If it was anything else such as a sensor there would usually be separate codes. Let me know how it goes or if you have more questions, thanks.
No problem, keep me updated. Thanks again and have a great day!