AutoCodes – Generic – U1139

U1139 Code - Invalid Or Missing Data For Primary Id

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Module that is not communicating, Module harness is open or shorted, Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U1139 indicates Invalid Or Missing Data For Primary Id.
Common causes: Common causes include Faulty Module that is not communicating, Module harness is open or shorted, Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 8,825

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1139 Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within 5 seconds of beginning serial data communication, the Diagnostic Trouble Code (DTC) is set.

OBDII Code U1139 - Invalid Or Missing Data For Primary Id - AutoCodes.com — U1139 Code - Invalid Or Missing Data For Primary Id

What does this mean?

What are the Possible Causes of the DTC U1139?

Faulty Module that is not communicating
Module harness is open or shorted
Module circuit poor electrical connection

How to Fix the DTC U1139?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1139 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U1139 code?

Need more information on how to fix the U1139 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1139 code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U1139 Code

1. What are the common symptoms of OBDII code U1139?

- Common symptoms include engine misfires, rough idling, poor acceleration, and potential stalling.

2. What causes the OBDII code U1139 to appear?

- This code usually indicates an issue with the communication network between control modules or a faulty primary identification data.

3. How can I diagnose the cause of the U1139 code?

- A thorough inspection of the wiring, connectors, and control modules associated with the primary identification data is recommended. A professional diagnostic scan tool can help pinpoint the exact issue.

4. Can a loose or corroded connection trigger code U1139?

- Yes, loose or corroded connections in the primary identification data circuit can lead to the U1139 code being triggered.

5. Is it safe to continue driving with the U1139 code present?

- It is generally not recommended to continue driving with the U1139 code active, as it can lead to further damage or performance issues. It's best to address the problem promptly.

6. Are there any DIY repair tips for resolving the U1139 code?

- DIY repair tips include checking for loose connections, cleaning corroded terminals, and ensuring all wiring associated with the primary identification data is intact.

7. Can resetting the fault codes clear U1139 permanently?

- Resetting the fault codes may temporarily clear the U1139 code, but if the underlying issue is not addressed, the code is likely to reappear.

8. Do I need a professional mechanic to fix the U1139 code?

- While some DIY troubleshooting and repairs are possible, resolving the U1139 code may require the expertise of a professional mechanic with advanced diagnostic tools.

9. Can a software update resolve the U1139 code?

- In some cases, a software update from the manufacturer may address communication issues triggering the U1139 code. Consult with a qualified technician for guidance.

10. How long does it typically take to repair the U1139 code?

- The repair time for the U1139 code can vary depending on the underlying cause and the complexity of the fix. It may range from a quick wiring connection repair to a more involved module replacement, so it's best to consult with a professional for an accurate estimate.