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P1885 Transmission Transfer Case Disengaged Solenoid Short to Ground

The OBD2 code P1885 indicates a malfunction in the transmission transfer case disengaged solenoid, specifically that there is a short circuit to ground in the solenoid circuit, which can affect the operation of the...

Definition

The OBD2 code P1885 indicates a malfunction in the transmission transfer case disengaged solenoid, specifically that there is a short circuit to ground in the solenoid circuit, which can affect the operation of the transfer case

Common causes

  • Shorted wiring or connectors
  • Faulty transmission control module (TCM)
  • Defective transfer case disengaged solenoid
  • Poor ground connections
  • Corroded or damaged electrical connectors
  • Internal transfer case issues
  • Faulty transmission harness

Common misdiagnoses

  • Faulty transfer case control module
  • Wiring issues or shorts in the harness
  • Defective transmission control module
  • Malfunctioning transfer case motor
  • Low transmission fluid levels
  • Faulty sensors related to the transfer case
  • Issues with the vehicle's computer system or software
  • Problems with the gear shift mechanism

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

    Visual Inspection: Check the wiring harness and connectors associated with the transfer case solenoid for any signs of damage, such as fraying, corrosion, or loose connections

  3. 3. Grounding Issues

    Ensure that the ground connections are secure and free of corrosion

  4. 4. Test the Solenoid

    Resistance Check: Use a multimeter to measure the resistance of the solenoid. Compare the reading to the manufacturer’s specifications. A reading outside the specified range may indicate a faulty solenoid

  5. 5. Power and Ground Check

    With the ignition on, check for power and ground at the solenoid connector. If there is no power or ground, trace the wiring back to the control module

  6. 6. Inspect the Transfer Case

    Physical Inspection: Check the transfer case for any signs of damage or wear that could affect the operation of the solenoid

  7. 7. Fluid Level

    Ensure that the transfer case fluid is at the correct level and in good condition

  8. 8. Check the Control Module

    Functionality: If the solenoid and wiring are in good condition, the issue may lie with the control module. Check for any software updates or known issues with the module

  9. 9. Signal Testing

    Use a scan tool to monitor the signals sent to the solenoid from the control module. This can help determine if the module is functioning correctly

  10. 10. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  11. 11. Take the vehicle for a test drive to see if the code reappears. Monitor the operation of the transfer case during the drive

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P1885 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  13. 13. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose more complex issues.Conclusion By following these troubleshooting steps, you can systematically identify and address the cause of the P1885 code. Always refer to the vehicle’s service manual for specific procedures and specifications related to your vehicle