WOMS
P code powertrain Medium severity

P1768 Performance / Normal / Winter Mode Input Malfunction

The OBD2 code P1768 indicates a malfunction in the input signal related to the performance, normal, or winter mode settings of the transmission, suggesting an issue with the transmission control system's ability to...

Definition

The OBD2 code P1768 indicates a malfunction in the input signal related to the performance, normal, or winter mode settings of the transmission, suggesting an issue with the transmission control system's ability to determine the selected driving mode

Common causes

  • Faulty transmission control module (TCM)
  • Defective input/output speed sensors
  • Wiring issues or damaged connectors
  • Malfunctioning mode switch
  • Low transmission fluid level or quality
  • Faulty transmission solenoids
  • Software issues or programming errors in the TCM
  • Mechanical transmission problems

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Faulty sensors (e.g., input/output speed sensors)
  • Shift solenoid malfunctions
  • Engine control module (ECM) issues
  • Incorrectly diagnosed transmission problems
  • Software or calibration errors

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing all related codes can help pinpoint the issue

  2. 2. Inspect Wiring and Connectors

    Examine the wiring and connectors related to the transmission control module (TCM) and the mode switch. Look for signs of damage, corrosion, or loose connections

  3. 3. Test the Mode Switch

    The mode switch (which may include performance, normal, and winter modes) should be tested for proper operation. Use a multimeter to check for continuity and ensure it is functioning correctly

  4. 4. Check Transmission Fluid

    Inspect the transmission fluid level and condition. Low or dirty fluid can cause shifting issues and may trigger error codes. If necessary, change the fluid and filter

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

    Check the TCM for any signs of damage or malfunction. If the TCM is suspected to be faulty, it may need to be reprogrammed or replaced

  6. 6. Look for Mechanical Issues

    Inspect the transmission for any mechanical problems, such as slipping, binding, or other performance issues that could affect the mode operation

  7. 7. Perform a Reset

    Clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns. Sometimes, a reset can resolve temporary glitches

  8. 8. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to your vehicle's make and model that may address known issues with the P1768 code

  9. 9. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or transmission specialist who can perform more in-depth diagnostics

  10. 10. Document Findings

    Keep a record of any findings, repairs, or parts replaced during the troubleshooting process for future reference. By following these steps, you can systematically diagnose and potentially resolve the issue associated with the P1768 code