:welcome: Code 0471 is Exhaust press sensor range/perf. I would say you might have just had a temporary spike in the exhaust back pressure if you had gotten on it hard and let off in a hurry. Just reset it and do not worry for now. Without knowing anything more about your truck I can not tell you much more.
the code has not reappeared although i have noticed that when going 60-70mph and letting off the gas it feels as though there is some sort of back pressure built up. it feels like the exhaust brake but not as strong.
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