Def System Diagram
P201a – reductant injector – circuit range/performance bank 2 unit 1 Selective catalytic reduction Reductant injector sensor nox scr circuit bank catalyst performance threshold range location system injection def efficiency unit below located troublecodes
GMC Sierra 3500 HD Diesel Exhaust Fluid (DEF) Tank Drain Line. Drain
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What is def and what does it do?
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