u1129 scp j1850 invalid or missing data for primary id
What it means:
OBD2 Code: U1129
Description: SCP (J1850) Invalid or Missing Data for Primary ID
Definition: This code indicates that there is a communication issue on the SCP (Standard Corporate Protocol) network, specifically related to invalid or missing data from the primary ID. This can affect vehicle systems that rely on this data for proper operation.
Common Causes:
Description: SCP (J1850) Invalid or Missing Data for Primary ID
Common Causes:
- Faulty or damaged wiring harness
- Poor electrical connection in the circuit
- Malfunctioning control module
- Issues with the vehicle’s communication network
- Corrosion or damage at connectors and terminals
Common Misdiagnosis:
OBD2 Code: U1129
Description: SCP (J1850) Invalid or Missing Data for Primary ID
Common Misdiagnosis: Faulty PCM (Powertrain Control Module) replacement without verifying wiring issues or network communication faults.
Common Diagnostic Steps:
OBD2 Code: U1129
Description: SCP (J1850) Invalid or Missing Data for Primary ID
Common Diagnostic Steps:
- Check for any additional trouble codes that may be present and address them first.
- Inspect the vehicle’s wiring harnesses and connectors for signs of damage, corrosion, or disconnection.
- Verify the integrity of the communication bus by checking voltage levels and continuity.
- Test the modules on the network to ensure they are functioning correctly and communicating as expected.
- Update or reprogram any control modules if a software issue is suspected.
- If necessary, consult technical service bulletins (TSBs) related to this code for specific vehicle models.