U1334 – Invalid Data Received from Vehicle Speed Control Module.

The ODBII 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.

The severity of ODBII code U1334 is generally considered moderate.

Common Causes For: U1333 U1333: “Control Module Communication Fault”

• 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 misdiagnosis for U1334 Invalid Data Received from Vehicle Speed Control Module.

• 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

Common Troubleshooting Steps

When dealing with the OBD-II code U1334, which indicates “Invalid Data Received from Vehicle Speed Control Module,” it’s important to follow a systematic approach to troubleshoot the issue. Here are common troubleshooting steps:

• 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.
• Inspect Wiring and Connectors:
• Examine the wiring and connectors related to the Vehicle Speed Control Module (VSCM) for any signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harness that connects the VSCM to the vehicle’s main harness.
• Test the Vehicle Speed Sensor (VSS):
• The VSS is crucial for providing speed data to the VSCM. Test the VSS for proper operation using a multimeter or scan tool.
• Check for proper voltage and signal output from the sensor.
• Check the VSCM:
• Inspect the Vehicle Speed Control Module for any signs of damage or corrosion.
• If possible, test the module to ensure it is functioning correctly. This may require specialized equipment or a professional diagnostic tool.
• Inspect the CAN Bus:
• 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.
• Look for any shorts, opens, or resistance issues in the CAN bus wiring.
• Check for Software Updates:
• Sometimes, manufacturers release software updates for the VSCM or other related modules. Check if there are any updates available for your vehicle’s software.
• Clear Codes and Test Drive:
• After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears. Monitor the vehicle’s performance and any related systems.
• Consult Technical Service Bulletins (TSBs):
• 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.
• Professional Diagnosis:
• 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.