Chevrolet P111D: Intake Air Temperature (IAT) Sensor 1-Fuel Temperature Sensor 2 Correlation

What Does The Chevrolet P111D Code Mean?

Ignition has been OFF for 8 hours or more. The ambient temperature is warmer than -60°C (-76°F). The engine is running. OR Condition 2 DTCs P0016, P0112, P0113, P0187, P0188, P0335, P0336, P0340, or P0341 are not set. Ignition has been OFF for 8 hours or more. The ambient temperature is warmer than -60°C (-76°F). The engine is running. In the first 60 s of engine run time, the ECM determines the block heater is OFF. AND In the first 10 minutes of engine run time, the vehicle speed as been at least 24 km/h (15 mph) for at least 5 minutes and the ECM determines there is no Sunload This DTC runs once per key cycle when the conditions in 1 or 2 are met.

Condition 1: The ECM determines the absolute temperature difference between the Fuel Temperature Sensor 2 and the IAT Sensor 1 signals is more than 100°C (180°F) at start up.

Condition 2:

• The ECM determines the absolute temperature difference between the CAC Temperature Sensor signal and the IAT Sensor 2 signal is more than 20°C (36°F), but less than or equal to 100°C (180°F) after 10 minutes of engine run time.
• The ECM determines the block heater if OFF.
• The ECM determines there is no sunload.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

• GM, 2012, Service Bullettin – Information On Identifying Duramax™ Diesel Overpower Engine Breakdown or Non-Function Due to
  Aftermarket Power-Up Devices vs. Non Overpower Engine Non-Function of Pistons, Cylinders, Valvetrain
  Components, DTC P003A or P111D Set.
• GM, 2015, Service Bullettin – Information On Identifying Duramax™ Diesel Overpower Engine Breakdown or Non-Function Due to
  Aftermarket Power-Up Devices vs. Non Overpower Engine Non-Function of Pistons, Cylinders, Valvetrain
  Components, DTC P003A or P111D Set.