u1143 invalid or missing data for primary id

OBD2 Code: U1143

Description: Invalid or Missing Data for Primary ID

Definition: This code indicates that the vehicle’s control module has detected a problem with the communication network, specifically related to the primary identification data. It means that there is either invalid data being received or some expected data is missing from one of the modules on the vehicle’s network.

: Invalid or missing data for primary id
Severity: Medium

Common Causes

– Common Causes:
– Loose connection at the primary ID sensor
– Faulty primary ID sensor
– Wiring issues in the primary ID sensor circuit

 

Common Misdiagnosis

Invalid or Missing Data for Primary ID
Common Misdiagnosis: Faulty wiring or connectors, failing control module, or incorrect software updates.

 

Common Diagnostic Steps

OBD2 Code: U1143
Description: Invalid or Missing Data for Primary ID
Common Diagnostic Steps:

• Check for any stored codes in the vehicle’s ECU that may be related to communication issues.
• Inspect the wiring and connectors associated with the data bus network for damage, corrosion, or loose connections.
• Verify that all modules on the network are properly powered and grounded.
• Use a scan tool to monitor live data and ensure proper communication between modules.
• If applicable, update or reprogram the software of affected control modules to resolve any known issues.
• If no faults are found, perform a continuity test on the communication lines to check for breaks or shorts.