WOMS
U code network Medium severity

U1248 SCP (J1850) Invalid or Missing Data for Time / Date

The OBD2 code U1248 SCP (J1850) indicates that there is invalid or missing data related to the time or date in the vehicle's communication network

Definition

The OBD2 code U1248 SCP (J1850) indicates that there is invalid or missing data related to the time or date in the vehicle's communication network

Common causes

  • Faulty or disconnected OBD-II connector
  • Malfunctioning PCM (Powertrain Control Module)
  • Corrupted or missing data in the vehicle's computer
  • Issues with the vehicle's battery or electrical system
  • Faulty wiring or connectors in the data communication network
  • Problems with the vehicle's clock or timekeeping system
  • Software glitches or outdated firmware in the PCM
  • Interference from aftermarket devices or modifications

Common misdiagnoses

  • Faulty PCM (Powertrain Control Module)
  • Bad wiring or connectors
  • Defective instrument cluster
  • Malfunctioning body control module (BCM)
  • Incorrectly set or dead battery
  • Issues with the OBDII port or scanner
  • Software glitches or updates needed
  • Faulty sensors related to time/date functions

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect the Battery and Charging System

    Ensure that the vehicle's battery is in good condition and fully charged. A weak battery can cause communication issues

  3. 3. Check the alternator and charging system to ensure they are functioning properly

  4. 4. Examine the Wiring and Connectors

    Inspect the wiring and connectors related to the SCP (J1850) communication network. Look for signs of damage, corrosion, or loose connections

  5. 5. Pay special attention to the connectors at the PCM (Powertrain Control Module) and any other modules that communicate over the SCP network

  6. 6. Check the Ground Connections

    Ensure that all ground connections related to the PCM and other modules are clean, tight, and free of corrosion. Poor ground connections can lead to communication issues

  7. 7. Test the SCP Communication Network

    Use a multimeter or an oscilloscope to check the SCP communication lines for proper voltage and signal integrity

  8. 8. Verify that the communication lines are not shorted or open

  9. 9. Inspect the PCM

    If the wiring and connections are good, the issue may lie within the PCM itself. Check for any signs of damage or failure

  10. 10. If possible, reflash or update the PCM software to ensure it is running the latest version

  11. 11. Check for Module Communication

    Use a scan tool to check if other modules on the SCP network are communicating properly. If other modules are also having communication issues, it may indicate a problem with the network itself

  12. 12. Clear the Codes and Test Drive

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

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

  14. 14. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the U1248 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that could help in troubleshooting

  15. 15. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle's specific systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the U1248 code