check engine code P111D

Question

Just tuned the truck 2011 GMC Sierra 3500 6.6 Duramax and now have engine light and code P111D. What is this and should I need to worry? Truck has 65K miles

Answer 1

You could either have a faulty Intake Air Temperature Sensor 1 or Fuel Temperature Sensor 2. Also, aftermarket power-up products could trigger this code.

P111D GMC - Intake Air Temperature Sensor 1 – Fuel Temperature Sensor 2 Correlation
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