WOMS
C code chassis Medium severity

C1136 Gear Select position short to ground

The OBD2 code C1136 indicates that there is a short circuit to ground in the gear select position sensor circuit, which affects the transmission's ability to determine the current gear selection

Definition

The OBD2 code C1136 indicates that there is a short circuit to ground in the gear select position sensor circuit, which affects the transmission's ability to determine the current gear selection

Common causes

  • Faulty gear position sensor
  • Damaged wiring or connectors
  • Short circuit in the wiring harness
  • Corroded connectors
  • Malfunctioning transmission control module (TCM)
  • Improperly adjusted gear selector
  • Grounding issues in the electrical system

Common misdiagnoses

  • Faulty transmission range sensor
  • Wiring issues or shorts in the harness
  • Malfunctioning powertrain control module (PCM)
  • Defective gear shift lever assembly
  • Issues with the vehicle's body control module (BCM)
  • Incorrectly installed or damaged connectors
  • Faulty neutral safety switch

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information related to the C1136 code, including wiring diagrams and component locations

  2. 2. Visual Inspection

  3. 3. Inspect the wiring and connectors associated with the gear selector and transmission control module (TCM) for any signs of damage, corrosion, or loose connections

  4. 4. Look for frayed wires or shorts in the harness that could cause a short to ground

  5. 5. Check the Gear Selector Switch

  6. 6. Test the gear selector switch (also known as the neutral safety switch or transmission range sensor) for proper operation. Ensure it is functioning correctly and is not stuck or damaged

  7. 7. Use a multimeter to check for continuity and proper voltage at the switch

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

  9. 9. Check the TCM for any signs of damage or water intrusion

  10. 10. Ensure that the TCM is properly connected and that there are no issues with the pins or connectors

  11. 11. Scan for Additional Codes

  12. 12. Use an OBD-II scanner to check for any other related trouble codes that may provide additional context or indicate other issues in the system

  13. 13. Test the Circuit

  14. 14. Use a multimeter to test the circuit for continuity and resistance. Check for any shorts to ground in the wiring harness

  15. 15. If applicable, check the resistance of the gear selector switch and compare it to the specifications in the service manual

  16. 16. Check for Ground Issues

  17. 17. Inspect the ground connections related to the transmission control system. Ensure that all ground points are clean, tight, and free of corrosion

  18. 18. Clear the Code and Test Drive

  19. 19. After performing the above checks and repairs, clear the trouble code using an OBD-II scanner

  20. 20. Take the vehicle for a test drive to see if the code reappears. Monitor the transmission operation during the drive

  21. 21. Consult a Professional

  22. 22. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission systems and can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the C1136 code. Always ensure safety precautions are taken when working on a vehicle's electrical system