WOMS
U code network Medium severity

U1158 SCP (J1850) Invalid or Missing Data for Antenna

The OBD2 code U1158 SCP (J1850) indicates that there is invalid or missing data related to the antenna, which may affect communication between the vehicle's modules

Definition

The OBD2 code U1158 SCP (J1850) indicates that there is invalid or missing data related to the antenna, which may affect communication between the vehicle's modules

Common causes

  • Faulty antenna
  • Damaged wiring or connectors
  • Poor ground connection
  • Malfunctioning control module
  • Interference from other electronic devices
  • Software issues or bugs in the vehicle's system
  • Corroded or loose connections
  • Faulty signal processing components

Common misdiagnoses

  • Faulty antenna
  • Wiring issues
  • Poor ground connection
  • Malfunctioning body control module (BCM)
  • Defective communication network
  • Incorrectly programmed or faulty key fob
  • Issues with the vehicle's security system
  • Faulty receiver module

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors related to the antenna and the communication network for any signs of damage, corrosion, or loose connections

  3. 3. Repair or Replace

    If any damaged wires or connectors are found, repair or replace them as necessary

  4. 4. Test the Antenna

    Functionality Check: Ensure that the antenna itself is functioning properly. If it’s a radio antenna, check if the radio is receiving signals correctly

  5. 5. Signal Strength

    If applicable, measure the signal strength to ensure the antenna is working as intended

  6. 6. Check the Communication Network

    Network Integrity: Ensure that the SCP (J1850) communication network is intact. Look for any shorts or opens in the network wiring

  7. 7. Bus Termination

    Verify that the bus is properly terminated at both ends, as improper termination can lead to communication issues

  8. 8. Inspect Modules

    Module Functionality: Check the functionality of the modules that communicate with the antenna. If a module is malfunctioning, it may not send or receive data correctly

  9. 9. Reprogram or Replace

    If a module is found to be faulty, consider reprogramming or replacing it

  10. 10. Check for Software Updates

    Manufacturer Updates: Check if there are any software updates available for the vehicle’s control modules. Sometimes, manufacturers release updates to fix known issues

  11. 11. Clear Codes and Test Drive

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

  12. 12. Take the vehicle for a test drive to see if the code reappears. Monitor the system to ensure that it is functioning correctly

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued bulletins regarding known issues and their fixes

  14. 14. 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 the specific vehicle and its systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the U1158 code. Always refer to the vehicle’s service manual for specific procedures and specifications