AutoCodes – Generic – U1019

U1019 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: U1019 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 12,227

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 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1019 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. When more than one critical parameter does not have an identification number associated with it, the DTC will only be reported once.

OBDII Code U1019 - Invalid Or Missing Data For Primary Id - AutoCodes.com — U1019 Code - Invalid Or Missing Data For Primary Id

What does this mean?

What are the Possible Causes of the DTC U1019?

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

How to Fix the DTC U1019?

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 U1019 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.

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Need Help with the Code?

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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 U1019 Code

1. What is OBDII code U1019?

Code U1019 stands for "Invalid or Missing Data for Primary Id" in the On-Board Diagnostics system.

2. What are common symptoms of OBDII code U1019?

Common symptoms include the check engine light being illuminated and potential issues with vehicle performance.

3. What are possible causes of OBDII code U1019?

Possible causes of code U1019 include faulty wiring, loose connections, a damaged control module, or issues with the primary communication network.

4. How is OBDII code U1019 diagnosed?

Diagnosing code U1019 usually involves using a diagnostic scanner to retrieve the code, testing the primary communication network, and inspecting the associated wiring and connections.

5. How can I repair OBDII code U1019?

Repairing code U1019 may involve repairing or replacing damaged wiring, ensuring all connections are secure, or replacing a faulty control module.

6. Can OBDII code U1019 cause other problems in the vehicle?

Yes, unresolved issues related to code U1019 can potentially lead to communication problems between vehicle modules and affect overall vehicle performance.

7. Is it safe to continue driving with OBDII code U1019 present?

It is generally not recommended to continue driving with unresolved OBDII codes, including U1019, as they can indicate underlying issues that may worsen over time.

8. Can a DIY enthusiast fix OBDII code U1019 at home?

Depending on the root cause, some DIY enthusiasts may be able to address code U1019 at home by following repair guides and using the necessary tools.

9. How much does it cost to repair OBDII code U1019 at a mechanic?

The cost of repairing code U1019 at a mechanic can vary based on the specific cause of the issue, but it may involve diagnostic fees, parts replacement, and labor costs.

10. Are there any preventive measures to avoid OBDII code U1019?

Regular vehicle maintenance, such as checking and cleaning electrical connections, can help prevent issues that may trigger code U1019 in the future.