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

What Does The GMC P111D Code Mean?

This code mean that:

• 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.

OR

• 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.

Conditions for setting the code:

• Case 1: 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.
• Case 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.

Recommended Parts

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

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Intake Air Charge Temperature Sensor
>>> GM Genuine Intercooler Temperature Sensor
>>> GM Genuine Fuel Temperature Sensor

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

Reference Sources

• Technical Service Bulletin 06-06-01-007G for P111D – General Motors; 2001–2013 GMC Sierra, 2003–2009 GMC TopKick, and 2006–2013 GMC Savana
• Technical Service Bulletin 06-06-01-007I for P111D – General Motors, 2001-2016 GMC Sierra, 2003-2009 GMC TopKick, and 2006-2016 GMC Savana