WOMS
U code network Medium severity

U1229 SCP (J1850) Invalid or Missing Data for Tires

The OBD2 code U1229 SCP (J1850) indicates that there is invalid or missing data related to the tire pressure monitoring system (TPMS) communication, often due to a malfunction in the system or a failure to receive data...

Definition

The OBD2 code U1229 SCP (J1850) indicates that there is invalid or missing data related to the tire pressure monitoring system (TPMS) communication, often due to a malfunction in the system or a failure to receive data from one or more tire sensors

Common causes

  • Faulty tire pressure monitoring system (TPMS) sensor
  • Damaged or corroded wiring or connectors
  • Low battery voltage in the TPMS sensor
  • Incorrect tire pressure
  • Malfunctioning TPMS receiver module
  • Software issues in the vehicle's control module
  • Interference from aftermarket devices or systems
  • Tire rotation or replacement without reprogramming the TPMS
  • Faulty vehicle control module (VCM)

Common misdiagnoses

  • Faulty Tire Pressure Monitoring System (TPMS) sensor
  • Damaged or corroded wiring/connectors
  • Malfunctioning Body Control Module (BCM)
  • Incorrect tire size or specifications
  • Software issues or outdated firmware in the vehicle's computer
  • Faulty instrument cluster
  • Issues with the vehicle's communication network (CAN bus)

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Addressing other codes may resolve the U1229 code

  2. 2. Inspect the Wiring and Connectors

    Examine the wiring and connectors related to the tire pressure monitoring system and the SCP bus. Look for signs of damage, corrosion, or loose connections

  3. 3. Check the Tire Pressure Sensors

    Ensure that all tire pressure sensors are functioning correctly. Check the battery levels in the sensors, as low battery voltage can cause communication issues

  4. 4. If the vehicle has been recently serviced (like tire rotation), ensure that the sensors are properly reprogrammed or reset

  5. 5. Verify the SCP Bus Integrity

    Use a multimeter to check the voltage and ground on the SCP bus. Ensure that the bus is receiving the correct voltage and that there are no shorts or open circuits

  6. 6. Inspect the TPMS Module

    Check the tire pressure monitoring system module for faults. If the module is malfunctioning, it may need to be replaced

  7. 7. Perform a System Reset

    Sometimes, clearing the code and resetting the system can resolve temporary communication issues. Use the OBD-II scanner to clear the code and see if it returns

  8. 8. Check for Software Updates

    Verify if there are any software updates available for the vehicle's ECU or TPMS. Sometimes, manufacturers release updates to fix known issues

  9. 9. Test the Vehicle's Battery and Charging System

    A weak battery or charging system can cause communication issues. Ensure that the battery is in good condition and that the charging system is functioning properly

  10. 10. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the U1229 code or the tire pressure monitoring system for your specific vehicle make and model. Manufacturers may have specific fixes for known issues

  11. 11. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis and repair. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the U1229 code