Diesel, DPF, DEF & EGRQuestionCommunity Starter

Question: DEF warning came back shortly after refill

JDMTuner26Community StarterApr 5, 20262023 GMC Sierra 1500 AT4Ohio
2023 GMC Sierra 1500 AT4, about 37,000 miles. Filled the DEF tank but warning returned sooner than expected. Before blaming the sensor, can old/contaminated fluid or crystallization create this kind of behavior? I'd rather test this logically than start replacing parts.
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