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P1835 Transmission Transfer Case Differential Lock-Up Solenoid Short Circuit To Ground

The OBD2 code P1835 indicates a short circuit to ground in the transmission transfer case differential lock-up solenoid, which can affect the operation of the solenoid responsible for engaging or disengaging the...

Definition

The OBD2 code P1835 indicates a short circuit to ground in the transmission transfer case differential lock-up solenoid, which can affect the operation of the solenoid responsible for engaging or disengaging the differential lock

Common causes

  • Faulty lock-up solenoid
  • Damaged wiring or connectors
  • Short circuit in the wiring harness
  • Corroded electrical connections
  • Failed transmission control module (TCM)
  • Malfunctioning transfer case control module
  • Grounding issues in the electrical system

Common misdiagnoses

  • Faulty transfer case control module
  • Wiring issues or shorts in the harness
  • Defective lock-up solenoid
  • Transmission control module problems
  • Incorrectly diagnosed transmission issues
  • Faulty sensors related to the transfer case
  • Issues with the vehicle's electrical system or grounds

Troubleshooting steps

  1. 1. Check for Additional Codes

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

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the transfer case differential lock-up solenoid. Look for signs of damage, fraying, corrosion, or loose connections

  3. 3. Ground Connections

    Ensure that all ground connections are secure and free of corrosion

  4. 4. Test the Solenoid

    Resistance Check: Disconnect the solenoid and use a multimeter to measure its resistance. Compare the reading to the manufacturer’s specifications. If it’s outside the specified range, the solenoid may be faulty

  5. 5. Power and Ground Test

    With the solenoid still disconnected, check for power and ground at the connector while the vehicle is in the appropriate mode (e.g., ignition on, engine running). This will help determine if the control circuit is functioning correctly

  6. 6. Check for Short Circuits

    Continuity Test: With the solenoid disconnected, perform a continuity test on the wiring to check for shorts to ground. If you find continuity where there shouldn’t be any, you may have a short circuit in the wiring

  7. 7. Inspect for Pinched Wires

    Look for any areas where the wiring may be pinched or damaged, which could cause a short to ground

  8. 8. Examine the Transfer Case Control Module

    If applicable, check the transfer case control module for any faults. This may involve checking for updates or reprogramming if necessary

  9. 9. Check for Mechanical Issues

    Inspect the transfer case for any mechanical issues that could affect the solenoid operation. This includes checking for proper fluid levels and any signs of internal damage

  10. 10. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code returns

  11. 11. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify the cause of the P1835 code and take appropriate action to resolve it