U1158 – SCP (J1850) Invalid or Missing Data for Antenna

The ODBII 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.

The severity of ODBII code U1158 SCP (J1850) Invalid or Missing Data for Antenna is moderate.

Common Causes For: U1157 U1157: Instrument Cluster Communication Loss

• 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 misdiagnosis for U1158 SCP (J1850) Invalid or Missing Data for Antenna

• 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

Common Troubleshooting Steps

When dealing with OBD-II code U1158, which indicates “Invalid or Missing Data for Antenna” in the context of the SCP (J1850) communication protocol, there are several common troubleshooting steps you can take to diagnose and potentially resolve the issue. Here’s a structured approach:

• 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.
• 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.
• **Repair or Replace: If any damaged wires or connectors are found, repair or replace them as necessary.
• 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.
• **Signal Strength: If applicable, measure the signal strength to ensure the antenna is working as intended.
• 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.
• **Bus Termination: Verify that the bus is properly terminated at both ends, as improper termination can lead to communication issues.
• 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.
• **Reprogram or Replace: If a module is found to be faulty, consider reprogramming or replacing it.
• 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.
• 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 system to ensure that it is functioning correctly.
• 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.
• 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.