The GMC P0797 Code is an important part of ensuring the safe and efficient operation of your vehicle. This code indicates a problem with the Pressure Control (PC) Solenoid 3, which is responsible for controlling the shift solenoid valve 1 and the transmission line pressure. If the engine run time is greater than 1 second, the transmission line pressure is greater than 370 kPa (54 psi) and not fluctuating by greater than 30 kPa (4 psi), and propulsion is active, then this code is triggered. Below is a table of potential causes and solutions for GMC P0797 Code.
Causes and Solutions for GMC P0797 Code
| Causes | Solutions |
|---|---|
| The clutch pressure control solenoid 3 commanded pressure is 5 kPa (1 psi) and the TFP switch 1 state is High for 36 seconds. | Check for any worn or damaged parts and replace them if necessary. Check for any loose or corroded wiring, and replace if necessary. |
| The clutch pressure control solenoid 3 commanded pressure is 5 kPa (1 psi) and the TFP switch 1 state is High for 1.25 seconds greater than 5 times during a key cycle. | Check the solenoid for any blockages or damage, and replace if necessary. Inspect the transmission fluid for any contaminants, and flush if necessary. |
| P0797 – Condition 1 | Inspect the pressure control solenoid and the transmission control module, and replace if necessary. |
| P0797 – Condition 2 | Check the transmission fluid levels and the transmission range switch, and replace if necessary. |
The Clutch Pressure Control Solenoid 3
The Clutch Pressure Control Solenoid 3 is an important component of the transmission system in GMC vehicles. This solenoid is responsible for controlling the shift solenoid valve 1 and the transmission line pressure. This solenoid is triggered if the engine run time is greater than 1 second, the transmission line pressure is greater than 370 kPa (54 psi) and not fluctuating by greater than 30 kPa (4 psi), and propulsion is active.
TFP Switch 1
The TFP Switch 1 is an important part of the transmission system in GMC vehicles. It is responsible for controlling the shift solenoid valve 1 and the transmission line pressure. If the TFP Switch 1 state is High for 36 seconds, it can trigger the GMC P0797 Code.
P0797 – Condition 1
P0797 – Condition 1 is triggered when the clutch pressure control solenoid 3 commanded pressure is 5 kPa (1 psi) and the TFP switch 1 state is High for 36 seconds. If this occurs, it is important to inspect the pressure control solenoid and the transmission control module, and replace them if necessary.
P0797 – Condition 2
P0797 – Condition 2 is triggered when the clutch pressure control solenoid 3 commanded pressure is 5 kPa (1 psi) and the TFP switch 1 state is High for 1.25 seconds greater than 5 times during a key cycle. If this occurs, it is important to check the transmission fluid levels and the transmission range switch, and replace them if necessary.
Conclusion
The GMC P0797 Code is an important part of ensuring the safe and efficient operation of your vehicle. When this code is triggered, it is important to check the Clutch Pressure Control Solenoid 3, the TFP Switch 1, and the transmission fluid levels and range switch. These components must be inspected and replaced if necessary to avoid further damage to the transmission system. By understanding the causes and solutions for GMC P0797 Code, you can ensure the safe and efficient operation of your vehicle. Taking the necessary steps to troubleshoot and repair the GMC P0797 Code can help you maintain optimal performance of your vehicle.
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