WOMS
C code chassis High severity

C1273 Motor # 2 Input Circuit Short to Vbat

The OBD2 code C1273 indicates that there is a short circuit in the input circuit of Motor #2, causing it to be connected directly to the vehicle's battery voltage (Vbat), which can lead to improper functioning of the...

Definition

The OBD2 code C1273 indicates that there is a short circuit in the input circuit of Motor #2, causing it to be connected directly to the vehicle's battery voltage (Vbat), which can lead to improper functioning of the motor

Common causes

  • Shorted wiring or connectors
  • Faulty motor or actuator
  • Damaged control module
  • Corroded or loose electrical connections
  • Grounding issues
  • Faulty sensors related to the motor
  • Incorrectly installed components

Common misdiagnoses

  • Faulty motor
  • Wiring issues
  • Bad connector
  • Shorted harness
  • Faulty control module
  • Grounding issues
  • Incorrectly installed components
  • Software glitches

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

    Visually inspect the wiring harness and connectors associated with Motor #2. Look for signs of damage, such as frayed wires, corrosion, or loose connections

  3. 3. Pay special attention to areas where the wiring may be exposed to heat, moisture, or mechanical wear

  4. 4. Test the Motor

    If accessible, test Motor #2 for proper operation. This may involve applying power directly to the motor to see if it functions correctly

  5. 5. Check the resistance of the motor windings to ensure they are within specifications

  6. 6. Check for Short Circuits

    Use a multimeter to check for continuity between the Motor #2 input circuit and battery voltage. A short circuit may indicate a problem in the wiring or connectors

  7. 7. Inspect the circuit for any signs of shorts to ground or other circuits

  8. 8. Inspect the Control Module

    If the wiring and motor are in good condition, the issue may lie within the control module (ECM or TCM). Check for any signs of damage or water intrusion

  9. 9. If possible, perform a software update or reset the control module to see if that resolves the issue

  10. 10. Check Power and Ground

    Verify that the motor is receiving the correct voltage and ground. Use a multimeter to measure voltage at the motor connector while the vehicle is in the appropriate state (e.g., ignition on)

  11. 11. Ensure that the ground connections are clean and secure

  12. 12. Clear Codes and Test Drive

    After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner

  13. 13. Take the vehicle for a test drive to see if the code reappears. Monitor the system to ensure it operates correctly

  14. 14. Seek Professional Help

    If the issue persists after performing the above steps, consider seeking assistance from a qualified mechanic or automotive technician who has experience with your vehicle's make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1273 code