When it comes to the GMC P111C Code, it is important to know the causes and solutions to this problem. The code is triggered when the engine control module (ECM) determines an absolute temperature difference between the charge air cooler temperature sensor signal and the intake air temperature sensor 2 signal. The GMC P111C Code can be triggered in two different conditions – if the absolute temperature difference between the two signals is more than 100°C (180°F) at start up or if it is more than 35°C (63°F) but less than or equal to 100°C (180°F) after 10 minutes of engine run time. Additionally, the ECM determines the block heater is off and there is no sunload. To avoid this issue, it is essential to understand the causes and solutions to the GMC P111C Code.
Causes and Solutions for GMC P111C Code
| Causes | Solutions |
|---|---|
| The ECM determines the absolute temperature difference between the CAC Temperature Sensor signal and the IAT Sensor 2 signal is more than 100°C (180°F) at start up. | Check the ECM for any fault codes, then replace the CAC Temperature Sensor or IAT Sensor 2. |
| The ECM determines the absolute temperature difference between the CAC Temperature Sensor signal and the IAT Sensor 2 signal is more than 35°C (63°F), but less than or equal to 100°C (180°F) after 10 minutes of engine run time. | Verify the ECM and the sensor harnesses for any signs of damage. |
| The ECM determines the block heater is OFF. | Check the wiring and connectors for any corrosion or damage. |
| The ECM determines there is no sunload. | Replace the sunload sensor if necessary. |
Understanding ECM Determinations
The Engine Control Module (ECM) is the computer system responsible for monitoring and controlling the engine performance. It determines the absolute temperature difference between the CAC Temperature Sensor and IAT Sensor 2 signals and triggers the GMC P111C Code if it is more than 100°C (180°F) at start up or more than 35°C (63°F) but less than or equal to 100°C (180°F) after 10 minutes of engine run time. In addition, the ECM determines the block heater is off and there is no sunload.
Checking the ECM and Sensor Harnesses
When the ECM determines an absolute temperature difference between the CAC Temperature Sensor and IAT Sensor 2 signals, it is important to check the ECM and sensor harnesses for any signs of damage. Additionally, the wiring and connectors should also be inspected for any corrosion or damage.
Replacing the CAC Temperature Sensor or IAT Sensor 2
If the ECM detects the absolute temperature difference between the CAC Temperature Sensor and IAT Sensor 2 signals is more than 100°C (180°F) at start up, it is recommended to replace the CAC Temperature Sensor or IAT Sensor 2.
Replacing the Sunload Sensor
If the ECM determines that there is no sunload, the sunload sensor should be replaced.
Conclusion
GMC P111C Code is triggered when the Engine Control Module (ECM) determines an absolute temperature difference between the charge air cooler temperature sensor signal and the intake air temperature sensor 2 signal. To prevent this issue, it is essential to understand the causes and solutions to the GMC P111C Code. This includes checking the ECM and sensor harnesses, replacing the CAC Temperature Sensor or IAT Sensor 2, and replacing the sunload sensor if necessary. With the right knowledge and understanding, GMC P111C Code can be easily prevented and resolved.
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