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P1860 TCC PWM Solenoid Circuit Electrical/ Transmission Transfer Case Contact Plate 'D' Short Circuit To Battery

The OBD2 code P1860 indicates a short circuit in the TCC (Torque Converter Clutch) PWM (Pulse Width Modulation) solenoid circuit, specifically related to the transmission transfer case contact plate 'D', which is...

Definition

The OBD2 code P1860 indicates a short circuit in the TCC (Torque Converter Clutch) PWM (Pulse Width Modulation) solenoid circuit, specifically related to the transmission transfer case contact plate 'D', which is causing an electrical issue

Common causes

  • Shorted wiring or connectors
  • Faulty TCC PWM solenoid
  • Damaged transmission control module (TCM)
  • Faulty transmission transfer case contact plate
  • Poor ground connections
  • Corroded or damaged electrical connectors
  • Internal transmission failure

Common misdiagnoses

  • Faulty TCC PWM solenoid
  • Transmission control module (TCM) issues
  • Wiring harness problems
  • Short circuits in the transmission harness
  • Faulty transmission fluid temperature sensor
  • Defective transfer case control module
  • Incorrectly installed or damaged contact plate
  • Low transmission fluid levels or contamination
  • Faulty engine control module (ECM)
  • Issues with the torque converter

Troubleshooting steps

  1. 1. Scan Tool Verification

    Use an OBD-II scanner to confirm the presence of the P1860 code and check for any other related codes that may provide additional context

  2. 2. Visual Inspection

    Inspect the wiring and connectors associated with the TCC PWM solenoid and the transmission transfer case contact plate. Look for

  3. 3. Damaged, frayed, or corroded wires

  4. 4. Loose or damaged connectors

  5. 5. Signs of short circuits or grounding issues

  6. 6. Check the TCC PWM Solenoid

    Test the TCC PWM solenoid for proper operation. This may involve

  7. 7. Measuring the resistance of the solenoid with a multimeter (refer to the vehicle's service manual for specifications)

  8. 8. Applying power directly to the solenoid to see if it activates

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

    Check the TCM for any faults. This may involve

  10. 10. Ensuring that the TCM is receiving proper power and ground

  11. 11. Checking for any software updates or reprogramming needs

  12. 12. Check for Short Circuits

    Use a multimeter to check for continuity between the TCC PWM solenoid circuit and the battery. A short circuit will show continuity where it shouldn't

  13. 13. Inspect the wiring harness for any signs of wear or damage that could cause a short

  14. 14. Test the Contact Plate

    If applicable, inspect the transmission transfer case contact plate 'D' for any signs of damage or wear. Ensure that it is properly connected and functioning

  15. 15. Check Ground Connections

    Ensure that all ground connections related to the TCC PWM solenoid and TCM are clean and secure. Poor ground connections can lead to electrical issues

  16. 16. Clear Codes and Test Drive

    After performing repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  17. 17. Seek Professional Help

    If you are unable to resolve the issue, consider seeking assistance from a qualified mechanic or automotive technician who has experience with transmission systems and OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the P1860 code