WOMS
P code powertrain Medium severity

P0952 ASM Control Circuit Low

The OBD2 code P0952 indicates a low voltage condition in the ASM (Automated Manual Transmission) control circuit, which may affect the transmission's operation

Definition

The OBD2 code P0952 indicates a low voltage condition in the ASM (Automated Manual Transmission) control circuit, which may affect the transmission's operation

Common causes

  • Faulty ASM control module
  • Damaged wiring or connectors in the ASM circuit
  • Short circuit in the ASM control circuit
  • Open circuit in the ASM control circuit
  • Poor ground connection
  • Malfunctioning sensors related to the ASM system
  • Corroded connectors or terminals

Common misdiagnoses

  • Transmission Control Module (TCM) failure
  • Faulty wiring or connectors
  • Defective transmission solenoid
  • Low transmission fluid level
  • Faulty speed sensor
  • Malfunctioning clutch actuator
  • Incorrectly calibrated transmission
  • Engine control module (ECM) issues

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 and connectors associated with the ASM control circuit. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harness that connects to the transmission control module (TCM) and the transmission itself

  4. 4. Test the ASM Control Circuit

    Use a multimeter to test the voltage and ground at the ASM control circuit. Compare the readings to the specifications in the vehicle’s service manual

  5. 5. Check for continuity in the circuit to ensure there are no breaks or shorts

  6. 6. Check the Transmission Fluid

    Ensure that the transmission fluid is at the correct level and in good condition. Low or dirty fluid can cause transmission issues

  7. 7. If the fluid is dirty, consider performing a transmission fluid change

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

    If the wiring and connectors are in good condition, the issue may lie within the TCM itself. Check for any signs of damage or malfunction

  9. 9. If possible, reprogram or reset the TCM to see if that resolves the issue

  10. 10. Check for Mechanical Issues

    Inspect the transmission for any mechanical issues that could affect the ASM system. This includes checking for proper operation of the shift solenoids and other components

  11. 11. Perform a System Reset

    After addressing any issues found, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P0952 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  13. 13. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or a transmission specialist for further diagnosis.Conclusion Troubleshooting OBD-II code P0952 involves a systematic approach to check the electrical components, wiring, and the transmission system itself. Always refer to the vehicle’s service manual for specific procedures and specifications