u1028 scp j1850 invalid or missing data for primary id

OBD2 Code: U1028

Description: SCP (J1850) Invalid or Missing Data for Primary ID

Definition: This code indicates that there is a communication issue on the vehicle’s network, specifically related to the SCP (Standard Corporate Protocol) J1850 bus. The data from a specific module identified as the “Primary ID” is either invalid or not being received by other modules on the network.

U1028 SCP J1850 Invalid or Missing Data for Primary ID: Communication error between modules. Typical severity: Moderate.

Common Causes

U1028 – SCP J1850 Invalid or Missing Data for Primary ID

Common Causes:

• Malfunctioning or damaged wiring in the SCP (Standard Corporate Protocol) network
• Issues with the J1850 communication bus
• Faulty control module that is not sending proper data on the network
• Interference from aftermarket electronic devices affecting communication on the network

 

Common Misdiagnosis

OBD2 Code: U1028
Description: SCP (J1850) Invalid or Missing Data for Primary ID
Common Misdiagnosis: Faulty wiring or connectors are often misdiagnosed as a defective control module.

 

Common Diagnostic Steps

OBD2 Code: U1028
Description: SCP (J1850) Invalid or Missing Data for Primary ID
Common Diagnostic Steps:

• Check the vehicle’s battery voltage and ensure it is within the specified range.
• Inspect all related fuses and relays for any signs of damage or failure.
• Examine the wiring harness and connectors associated with the SCP (J1850) network for any loose connections, corrosion, or damage.
• Use a scan tool to check for additional trouble codes that may provide more context on the issue.
• Perform a continuity test on the communication lines to ensure there are no breaks in the circuit.
• If applicable, update or reprogram the control module software as per manufacturer guidelines.
• If necessary, replace faulty components such as modules or sensors that are not communicating properly over the network.