AutoCodes – Generic – U1168

U1168 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: U1168 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 6,374

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1168 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 U1168 - Invalid Or Missing Data For Primary Id - AutoCodes.com — U1168 Code - Invalid Or Missing Data For Primary Id

What does this mean?

What are the Possible Causes of the DTC U1168?

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

How to Fix the DTC U1168?

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 U1168 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 U1168 code?

Need more information on how to fix the U1168 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1168 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 U1168 Code

1. What are the common symptoms of OBDII code U1168?

- Common symptoms include the check engine light being illuminated on the dashboard, issues with vehicle performance, and potential difficulty starting the vehicle.

2. What can cause the OBDII code U1168 to be triggered?

- The code U1168 is typically triggered by communication errors within the vehicle's network, such as damaged wiring, loose connections, or faulty modules.

3. How can I diagnose the OBDII code U1168?

- Diagnosis involves using a diagnostic scanner to retrieve the code, checking for any additional related codes, and then inspecting the vehicle's network for communication issues.

4. Are there specific vehicles that are more prone to experiencing the U1168 code?

- The U1168 code can appear in various vehicle makes and models, but it is more commonly seen in newer vehicles with advanced network systems.

5. What are some potential repair tips for addressing the U1168 code?

- Repair tips may include checking and repairing any damaged wiring, securing loose connections, resetting the code, and performing a thorough inspection of the vehicle's network components.

6. Can I continue driving my vehicle with the U1168 code present?

- It is not recommended to ignore the U1168 code, as it can lead to further electrical issues and potentially affect the vehicle's performance and safety.

7. How much does it typically cost to repair the U1168 code?

- The cost of repair can vary depending on the specific cause of the code and the extent of the repairs needed. It is advisable to consult with a professional mechanic for an accurate estimate.

8. Is it possible to prevent the U1168 code from appearing in the future?

- Regular maintenance and inspections of the vehicle's electrical system, including the network components, can help prevent the U1168 code from reoccurring.

9. Can a DIY enthusiast fix the U1168 code themselves?

- While some simple repairs like checking connections can be done by DIY enthusiasts, diagnosing and repairing complex network issues related to the U1168 code may require professional assistance.

10. How long does it take to resolve the U1168 code issue?

- The time needed to resolve the U1168 code can vary depending on the complexity of the underlying issue. Simple fixes may take a short time, while more intricate repairs could require more extensive work and time.