u1139 invalid or missing data for primary id

OBD2 Code: U1139

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 invalid or missing data from a primary identification source. This can affect the proper functioning of various systems within the vehicle.

: Invalid or missing data for primary id
Severity: Medium

Common Causes

U1139 – Invalid or Missing Data for Primary ID

Common Causes:

• Malfunctioning or disconnected primary ID sensor
• Faulty wiring or connections related to the primary ID sensor
• Corroded terminals in the primary ID sensor circuit
• Software issues within the vehicle’s computer system

Common Misdiagnosis

OBD2 Code: U1139
Description: Invalid or Missing Data for Primary ID
Common Misdiagnosis: Faulty wiring harness, malfunctioning control module, or incorrect software updates.

Common Diagnostic Steps

OBD2 Code: U1139
Description: Invalid or Missing Data for Primary ID

1. Check the vehicle’s battery and charging system to ensure proper voltage levels.
2. Inspect all related fuses and relays for any signs of damage or failure.
3. Examine the wiring harnesses and connectors associated with the primary ID module for any loose connections, corrosion, or damage.
4. Use a scan tool to check for any additional trouble codes that may be present, which could provide further insight into the issue.
5. Verify that the software in the control modules is up-to-date; perform updates if necessary.
6. If applicable, test communication lines (CAN bus) between modules using an oscilloscope to identify any disruptions or anomalies.
7. If no faults are found in previous steps, consider replacing the primary ID module as a last resort after confirming it is defective.