U1160 – SCP (J1850) Invalid or Missing Data for Primary Id

The ODBII code U1160 SCP (J1850) Invalid or Missing Data for Primary Id indicates that the vehicle’s communication network is not receiving valid or expected data from a primary module, which may affect the operation of various systems.

The severity of ODBII code U1160 is moderate.

Common Causes For: U1159 SCP (J1850) Invalid or Missing Data for Antenna

• Faulty or damaged wiring/connectors
• Malfunctioning or disconnected sensors
• Issues with the vehicle’s communication network
• Faulty PCM (Powertrain Control Module)
• Corrupted or outdated software/firmware
• Interference from aftermarket devices
• Poor ground connections
• Low battery voltage or power supply issues

Common misdiagnosis for U1160 SCP (J1850) Invalid or Missing Data for Primary Id

• Faulty PCM (Powertrain Control Module)
• Bad wiring or connectors
• Defective sensors
• Communication issues between modules
• Incorrectly programmed or updated software
• Battery or power supply issues
• Grounding problems

Common Troubleshooting Steps

The OBD-II code U1160 indicates an issue with the SCP (Serial Communication Protocol) on the J1850 bus, specifically that there is invalid or missing data for the primary ID. This can be related to communication problems between modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve this issue:

• 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.
• Inspect Wiring and Connectors: Examine the wiring and connectors associated with the J1850 bus. Look for signs of damage, corrosion, or loose connections. Pay special attention to the connectors on the modules that communicate over this bus.
• Verify Power and Ground: Ensure that the modules on the J1850 bus have proper power and ground connections. Use a multimeter to check voltage and ground continuity.
• Check for Module Communication: Use a scan tool to check if all modules on the J1850 bus are communicating properly. If some modules are not responding, it may indicate a problem with those specific modules or their connections.
• Inspect the SCP Bus: Use an oscilloscope or a scan tool with live data capabilities to monitor the SCP bus for proper signal levels and communication patterns. Look for any irregularities in the data transmission.
• Look for Interference: Check for any sources of electrical interference that could be affecting the communication on the J1850 bus. This could include aftermarket accessories or modifications.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the modules. Reconnect the battery and see if the code reappears.
• Update or Reprogram Modules: If the vehicle has had recent software updates or module replacements, ensure that all modules are updated to the latest software version. Sometimes, reprogramming a module can resolve communication issues.
• Replace Faulty Modules: If a specific module is identified as the source of the problem and is not communicating properly, it may need to be replaced.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the U1160 code. 1
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional technician or a dealership with specialized diagnostic equipment. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the U1160 code.