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P0797 Pressure Control Solenoid C Stuck On

The OBD2 code P0797 indicates that the Pressure Control Solenoid C is stuck in the "on" position, which can lead to issues with transmission fluid pressure and shifting performance

Definition

The OBD2 code P0797 indicates that the Pressure Control Solenoid C is stuck in the "on" position, which can lead to issues with transmission fluid pressure and shifting performance

Common causes

  • Faulty pressure control solenoid C
  • Wiring issues or damaged connectors
  • Low transmission fluid level
  • Contaminated transmission fluid
  • Faulty transmission control module (TCM)
  • Internal transmission problems
  • Poor electrical connections
  • Malfunctioning valve body

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Other solenoid failures
  • Valve body issues
  • Torque converter problems
  • Internal transmission damage
  • Engine control module (ECM) faults

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Examine the wiring and connectors leading to the Pressure Control Solenoid C. Look for signs of damage, corrosion, or loose connections that could affect the solenoid's operation

  3. 3. Test the Solenoid

    If accessible, test the Pressure Control Solenoid C for proper operation. This may involve measuring resistance with a multimeter or applying voltage to see if it activates correctly

  4. 4. Check Transmission Fluid

    Ensure that the transmission fluid is at the correct level and in good condition. Low or contaminated fluid can affect solenoid operation. If the fluid is dirty or burnt, consider a transmission fluid change

  5. 5. Inspect the Transmission Control Module (TCM)

    The TCM controls the solenoids. Check for any software updates or faults in the TCM that could be causing the issue

  6. 6. Look for Mechanical Issues

    Inspect the transmission for any mechanical problems that could affect solenoid operation, such as sticking valves or internal wear

  7. 7. Perform a System Reset

    Sometimes, clearing the code and resetting the system can resolve temporary issues. However, if the problem persists, further investigation is needed

  8. 8. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to your vehicle's make and model that might address known issues with the Pressure Control Solenoid C or related components

  9. 9. Professional Diagnosis

    If the issue remains unresolved after these steps, consider seeking help from a professional mechanic or transmission specialist who can perform more in-depth diagnostics. By following these steps, you can systematically identify the cause of the P0797 code and take appropriate action to resolve the issue