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C1150 Two Speed Rear Axle Input Switch Circuit Short to Vbatt

The OBD2 code C1150 indicates a malfunction in the two-speed rear axle input switch circuit, specifically that there is a short circuit to battery voltage (Vbatt), which may prevent the proper operation of the two-speed...

Definition

The OBD2 code C1150 indicates a malfunction in the two-speed rear axle input switch circuit, specifically that there is a short circuit to battery voltage (Vbatt), which may prevent the proper operation of the two-speed axle system

Common causes

  • Shorted wiring or connectors
  • Faulty input switch
  • Corroded or damaged connectors
  • Malfunctioning control module
  • Grounding issues
  • Improper installation or modifications

Common misdiagnoses

  • Faulty rear axle input switch
  • Wiring harness issues
  • Short circuit in the wiring
  • Faulty ABS module
  • Incorrectly diagnosed wheel speed sensors
  • Issues with the vehicle's body control module (BCM)
  • Problems with the powertrain control module (PCM)

Troubleshooting steps

  1. 1. Understand the Code

    C1150 typically relates to the two-speed rear axle system, indicating that the input switch circuit is shorted to battery voltage (Vbatt). This could mean that the switch is stuck in the "on" position or there is a wiring issue

  2. 2. Check the Vehicle’s Manual

    Refer to the vehicle’s service manual for specific information about the two-speed rear axle system, including wiring diagrams and component locations

  3. 3. Visual Inspection

    Inspect the wiring and connectors associated with the two-speed rear axle input switch. Look for

  4. 4. Damaged wires (fraying, cuts, or corrosion)

  5. 5. Loose or corroded connectors

  6. 6. Signs of short circuits (wires touching each other or grounding out)

  7. 7. Test the Input Switch

    Locate the two-speed rear axle input switch and test it

  8. 8. Use a multimeter to check the switch's resistance when it is in different positions (on/off)

  9. 9. Ensure that the switch operates correctly and does not show continuity when it should be open

  10. 10. Check for Short Circuits

    With the vehicle off, use a multimeter to check for continuity between the input switch circuit and battery voltage. If there is continuity when the switch should be open, there may be a short in the wiring

  11. 11. Inspect the Control Module

    If the wiring and switch are in good condition, the issue may lie within the control module

  12. 12. Check for any stored trouble codes that may provide additional context

  13. 13. Inspect the control module for signs of damage or corrosion

  14. 14. Clear Codes and Test Drive

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

  15. 15. Take the vehicle for a test drive to see if the code reappears

  16. 16. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the two-speed rear axle system for your specific vehicle make and model. There may be known issues or recalls that could provide additional guidance

  17. 17. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s specific systems.Tools Needed - OBD-II scanner - Multimeter - Basic hand tools for inspection and repair By following these steps, you should be able to identify and resolve the issue related to the C1150 code. Always ensure safety precautions are taken when working on a vehicle's electrical system