AutoCodes – Generic – U1038

U1038 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: U1038 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 7,870

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 U1038 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 U1038 - Invalid Or Missing Data For Primary Id - AutoCodes.com — U1038 Code - Invalid Or Missing Data For Primary Id

What does this mean?

What are the Possible Causes of the DTC U1038?

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

How to Fix the DTC U1038?

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 U1038 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 U1038 code?

Need more information on how to fix the U1038 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1038 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 U1038 Code

1. What are the common symptoms of OBDII code U1038?

- Common symptoms include issues with the vehicle's transmission, engine misfires, rough idling, and a decrease in overall performance.

2. What are the possible causes of OBDII code U1038?

- Possible causes may include faulty wiring, damaged connectors, issues with the primary id sensor, or a malfunction in the vehicle's onboard computer system.

3. How can I diagnose OBDII code U1038?

- Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes stored in the vehicle's computer system. Additionally, checking the primary id sensor and related wiring for any visible damage or issues is recommended.

4. How can I repair OBDII code U1038?

- Repairing the code may involve fixing any damaged wiring, replacing faulty connectors, or repairing/replacing the primary id sensor. It is also essential to clear the trouble codes after completing the repairs.

5. Can I drive my vehicle with OBDII code U1038?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potentially unsafe driving conditions. It is best to address the issue promptly.

6. How much does it cost to fix OBDII code U1038?

- The cost of fixing this code can vary depending on the specific cause of the issue, the extent of the repairs needed, and the labor rates of the repair shop. It is advisable to obtain a quote from a trusted mechanic.

7. Is OBDII code U1038 a serious problem?

- While the severity of the issue can vary, it is essential to address this code promptly to prevent further damage to the vehicle and ensure optimal performance.

8. Can a DIY enthusiast repair OBDII code U1038?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address this code themselves by following repair guides and tutorials. However, if unsure, it is best to seek professional assistance.

9. How long does it take to repair OBDII code U1038?

- The repair time can vary based on the specific cause of the issue, the availability of parts, and the expertise of the mechanic. In some cases, it can be resolved in a few hours, while more complex issues may take longer.

10. Will OBDII code U1038 cause my vehicle to fail an emissions test?

- Yes, this code can potentially cause the vehicle to fail an emissions test, as it indicates a problem with the primary id data. It is advisable to address this issue before undergoing an emissions test.