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We had the same problem with our GMC 3500, found out the senors was bad and needed to be replaced. It happened again this year we put DEF in and drove and still the same message 25% left on DEF, found a dealer drove in and he found that the engine and DEF senor were not at let me see I believe he said at the same temperature, which caused the message from not going away. He reset everything and it's been working find.
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