u1103 invalid or missing data for primary id

OBD2 Code: U1103

Description: Invalid or Missing Data for Primary ID

Definition: This code indicates that the vehicle’s control module has detected a communication issue with one of its components, where the data received is either invalid or missing. This can affect the vehicle’s performance and may require diagnostic procedures to identify and fix the underlying problem.

: Invalid or missing data for primary id
Severity: Medium

Common Causes

Common causes of this OBD2 code include:

• Issues with the primary identification data in the vehicle’s onboard computer system.
• Problems with the communication network between control modules.
• Faulty wiring or connectors related to the primary ID data.

 

Common Misdiagnosis

Invalid or Missing Data for Primary ID:
Common Misdiagnosis: Faulty wiring or connectors are often misdiagnosed as a problem with the control module.

 

Common Diagnostic Steps

OBD2 Code: U1103 – Invalid or Missing Data for Primary ID

• Check the vehicle’s battery voltage and ensure it is within the specified range.
• Inspect all related wiring harnesses and connectors for signs of damage, corrosion, or disconnection.
• Use a scan tool to check for any additional trouble codes that may be present and address them as necessary.
• Verify the integrity of the communication network (CAN bus) by checking for continuity and resistance in the circuit.
• Consult the vehicle’s service manual for specific diagnostic procedures related to this code.
• If applicable, update or reprogram the vehicle’s control modules with the latest software version provided by the manufacturer.
• If no faults are found in wiring or connections, consider replacing any suspect control modules after confirming they are faulty through proper testing methods.