AutoCodes – Generic – U1198

U1198 Code - Invalid Or Missing Data For External Access

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: U1198 indicates Invalid Or Missing Data For External Access.
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 8,526

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 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1198 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 U1198 - Invalid Or Missing Data For External Access - AutoCodes.com — U1198 Code - Invalid Or Missing Data For External Access

What does this mean?

What are the Possible Causes of the DTC U1198?

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

How to Fix the DTC U1198?

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 U1198 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 U1198 code?

Need more information on how to fix the U1198 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1198 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 U1198 Code

1. What are the common symptoms of OBDII code U1198?

- Common symptoms include issues with vehicle communication systems, such as difficulty connecting to diagnostic tools or missing data during scan tool readings.

2. What are some possible causes of OBDII code U1198?

- Possible causes include faulty wiring connections, damaged OBDII connectors, issues with the vehicle's network communication modules, or software malfunctions.

3. How can I diagnose OBDII code U1198?

- Diagnosing this code typically involves checking the wiring connections, inspecting the OBDII port for damage, and using diagnostic tools to analyze the vehicle's data communication systems.

4. What are some repair tips for fixing OBDII code U1198?

- Repair tips may include repairing or replacing damaged wiring, ensuring proper connection at the OBDII port, updating software as needed, and checking for any network communication module malfunctions.

5. Can OBDII code U1198 cause other issues with the vehicle?

- Yes, unresolved issues related to this code can potentially cause problems with diagnostic tool communication, affecting the ability to accurately diagnose and repair other vehicle issues.

6. Is it safe to continue driving with OBDII code U1198 present?

- It is generally safe to drive with this code, but it is recommended to address the underlying issue promptly to prevent potential problems with diagnostic tool communication and data access in the future.

7. How do I reset OBDII code U1198 after making repairs?

- After making necessary repairs, you can reset the code using a diagnostic tool or by disconnecting the vehicle's battery for a few minutes to clear the error code from the system.

8. Can a DIY enthusiast fix OBDII code U1198, or should it be done by a professional mechanic?

- Depending on the complexity of the underlying issue, DIY enthusiasts with knowledge of vehicle diagnostics and repair may be able to address OBDII code U1198. However, consulting a professional mechanic is recommended for accurate diagnosis and repair.

9. Are there any recalls or technical service bulletins related to OBDII code U1198?

- It is advisable to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins related to OBDII code U1198, as they may provide specific guidance or solutions.

10. How can I prevent OBDII code U1198 from recurring in the future?

- Regularly inspecting and maintaining the vehicle's wiring connections, ensuring the OBDII port is not damaged, and updating software as recommended can help prevent the recurrence of OBDII code U1198.