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Re: Trouble Code 0449
have had that problem P0449 replaced vent valve. gm has a bulletin on it with an updated vent valve it comes with new style vent and hose assembly, it gets plugged up and does not work right. the new kit comes with directions. it relocates vent hose. mine is between cab and box,was not all that bad to change. it cured DTC P0449
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