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U code network Medium severity

U1334 Invalid Data Received from Vehicle Speed Control Module

The OBD2 code U1334 indicates that the vehicle's control module has received invalid or erroneous data from the vehicle speed control module, which may affect the operation of speed-related functions

Definition

The OBD2 code U1334 indicates that the vehicle's control module has received invalid or erroneous data from the vehicle speed control module, which may affect the operation of speed-related functions

Common causes

  • Faulty Vehicle Speed Control Module (VSCM)
  • Damaged or corroded wiring/connectors
  • Faulty wheel speed sensors
  • Malfunctioning engine control module (ECM)
  • Software issues or programming errors
  • Poor ground connections
  • Intermittent electrical connections
  • Issues with the throttle position sensor (TPS)

Common misdiagnoses

  • Faulty Vehicle Speed Sensor
  • Malfunctioning Engine Control Module (ECM)
  • Wiring or connector issues
  • Faulty Transmission Control Module (TCM)
  • Incorrectly calibrated speedometer
  • Issues with the Anti-lock Braking System (ABS)
  • Problems with the cruise control system
  • Faulty throttle position sensor

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

  3. 3. Examine the wiring and connectors related to the Vehicle Speed Control Module (VSCM) for any signs of damage, corrosion, or loose connections

  4. 4. Pay special attention to the wiring harness that connects the VSCM to the vehicle's main harness

  5. 5. Test the Vehicle Speed Sensor (VSS)

  6. 6. The VSS is crucial for providing speed data to the VSCM. Test the VSS for proper operation using a multimeter or scan tool

  7. 7. Check for proper voltage and signal output from the sensor

  8. 8. Check the VSCM

  9. 9. Inspect the Vehicle Speed Control Module for any signs of damage or corrosion

  10. 10. If possible, test the module to ensure it is functioning correctly. This may require specialized equipment or a professional diagnostic tool

  11. 11. Inspect the CAN Bus

  12. 12. The U1334 code may be related to issues in the Controller Area Network (CAN) bus. Check for any faults in the CAN wiring and ensure that all modules are communicating properly

  13. 13. Look for any shorts, opens, or resistance issues in the CAN bus wiring

  14. 14. Check for Software Updates

  15. 15. Sometimes, manufacturers release software updates for the VSCM or other related modules. Check if there are any updates available for your vehicle's software

  16. 16. Clear Codes and Test Drive

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

  18. 18. Take the vehicle for a test drive to see if the code reappears. Monitor the vehicle's performance and any related systems

  19. 19. Consult Technical Service Bulletins (TSBs)

  20. 20. Look for any TSBs related to the U1334 code or the vehicle speed control system for your specific make and model. These bulletins may provide additional guidance or known fixes

  21. 21. Professional Diagnosis

  22. 22. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have access to advanced diagnostic tools and resources. By following these steps, you can systematically identify and resolve the issue related to the U1334 code