The P0797 trouble code indicates that the Pressure Control Solenoid C is stuck in the on position.
Pressure Control Solenoid “C” Stuck On
Code symptoms P0797.
1. Check Engine Light (CEL) illuminated on the dashboard.
2. Fluctuations in vehicle speed readings.
3. Problems with shifting gears, especially during acceleration or deceleration.
4. Harsh or delayed shifting.
5. Transmission may not respond properly to driver inputs.
6. Reduced fuel efficiency.
7. Transmission slipping.
Causes of the code P0797.
1. Faulty Pressure Control Solenoid C.
2. Wiring issues, such as damaged wires or poor connections in the circuit.
3. Low transmission fluid level or contaminated transmission fluid.
4. Intermittent solenoid failure.
5. Faulty transmission control module (TCM).
Code Solutions P0797.
1. Use a scan tool to retrieve freeze frame data and any other stored trouble codes. This information can provide insight into when and how the malfunction occurred.
2. Inspect the wiring and connectors associated with the Pressure Control Solenoid C circuit for any signs of damage, corrosion, or loose connections. Repair or replace any damaged wiring or connectors as needed.
3. Check the transmission fluid level and condition. Low fluid level or contaminated fluid can affect solenoid operation. If the fluid is low, top it up to the appropriate level. If it’s contaminated or burnt, a fluid flush and replacement may be necessary.
4. Test the Pressure Control Solenoid C itself using a multimeter or other appropriate diagnostic tools to ensure it is functioning properly. Replace the solenoid if necessary.
5. Perform a wiggle test on the wiring harness while monitoring solenoid data to simulate conditions that may cause intermittent faults. If the issue occurs during the test, focus on the area where the fault was induced.
6. Check the connectors and terminals for the solenoid and TCM for proper fit and corrosion. Clean and secure any loose connections.
7. If the problem persists, further diagnostics on the TCM and related systems may be necessary.
8. Clear the trouble codes from the vehicle’s computer memory and test drive the vehicle to see if the code returns. If it does, further diagnosis or repairs may be required.