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U code network Medium severity

U1228 SCP (J1850) Invalid or Missing Data for Tires

The OBD2 code U1228 SCP (J1850) indicates that there is invalid or missing data related to the tire pressure monitoring system (TPMS) or tire information, often due to communication issues between the vehicle's modules

Definition

The OBD2 code U1228 SCP (J1850) indicates that there is invalid or missing data related to the tire pressure monitoring system (TPMS) or tire information, often due to communication issues between the vehicle's modules

Common causes

  • Faulty tire pressure monitoring system (TPMS) sensor
  • Damaged or corroded wiring or connectors
  • Low battery voltage in the TPMS sensor
  • Incorrect tire size or type
  • Malfunctioning TPMS receiver module
  • Software issues in the vehicle's control module
  • Interference from aftermarket devices or systems
  • Poor signal transmission due to distance or obstacles

Common misdiagnoses

  • Faulty Tire Pressure Monitoring System (TPMS) sensor
  • Wiring issues or damaged connectors
  • Malfunctioning Body Control Module (BCM)
  • Incorrect tire size or type
  • Software glitches in the vehicle's computer system
  • Low battery voltage or electrical issues
  • Faulty or damaged tire pressure monitoring system module
  • Issues with the vehicle's communication network (CAN bus)

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing other codes may resolve the U1228 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. Pay special attention to the connectors at the TPMS sensors, the body control module (BCM), and any junction points in the wiring harness

  4. 4. Test the TPMS Sensors

    If equipped, check the tire pressure monitoring sensors in each tire. Ensure they are functioning correctly and that the batteries in the sensors are not dead

  5. 5. Use a TPMS tool to read the sensor data and verify that each sensor is transmitting data correctly

  6. 6. Check the Body Control Module (BCM)

    The BCM is often responsible for processing data from the TPMS. Ensure that the BCM is functioning properly and that it is receiving data from the TPMS sensors

  7. 7. If necessary, perform a reset or reprogramming of the BCM according to the manufacturer's specifications

  8. 8. Inspect the SCP Bus

    Check the SCP bus for any faults. This may involve using a multimeter to test for proper voltage and continuity along the bus lines

  9. 9. Look for any shorts or open circuits that could be affecting communication

  10. 10. Check for Interference

    Ensure that there are no aftermarket devices or modifications that could be interfering with the SCP communication. This includes devices like remote starters, alarms, or other electronic accessories

  11. 11. Perform a System Reset

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

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the U1228 code or the TPMS for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  13. 13. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose more complex issues

  14. 14. Replace Faulty Components

    If any faulty components are identified during the troubleshooting process (e.g., a defective TPMS sensor or BCM), replace them as necessary. By following these steps, you should be able to identify and resolve the issue causing the U1228 code. Always refer to your vehicle's service manual for specific procedures and specifications