I got the code P20C9 on my 2011 Isuzu, what is the most likely failure causing this code?

Question

I got the engine code P20C9 on my 2011 Isuzu, what is the most likely failure causing this code?

Answer 1

• Check Diesel Exhaust Fluid (DEF) level and condition
• Faulty Nitrogen Oxide (NOX) Sensor(s)
• Faulty Reductant Control Module
• Reductant Control Module harness is open or shorted
• Reductant Control Module circuit poor electrical connection

P20C9 Isuzu Code - Diesel Exhaust Fluid Control Module Requested MIL Illumination
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