AutoCodes – Generic – U1039

U1039 Code - Invalid Or Missing Data For Primary Id Vehicle Speed

Quick Answer

Network Diagnostic Trouble Code (DTC) occurs during module-to-module communication concerns. Common causes include Faulty Vehicle Speed Sensor, Vehicle speed sensor harness or connectors is open or shorted, Vehicle speed sensor 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: U1039 indicates Invalid Or Missing Data For Primary Id Vehicle Speed.
Common causes: Common causes include Faulty Vehicle Speed Sensor, Vehicle speed sensor harness or connectors is open or shorted, Vehicle speed sensor 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 18,266

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U1039 Description

Network Diagnostic Trouble Code (DTC) occurs during module-to-module communication concerns. Invalid data is received from the Vehicle Speed Sensor.

OBDII Code U1039 - Invalid Or Missing Data For Primary Id Vehicle Speed - AutoCodes.com — U1039 Code - Invalid Or Missing Data For Primary Id Vehicle Speed

What does this mean?

What are the Possible Causes of the DTC U1039?

Faulty Vehicle Speed Sensor
Vehicle speed sensor harness or connectors is open or shorted
Vehicle speed sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC U1039?

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 U1039 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 U1039 code?

Need more information on how to fix the U1039 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1039 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1039 Ford — Invalid Or Missing Data For Primary Id Vehicle Speed
U1039 Lincoln — Invalid Or Missing Data For Primary Id Vehicle Speed
U1039 Mercury — Invalid Or Missing Data For Primary Id Vehicle Speed

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 U1039 Code

1. What does the OBDII code U1039 mean?

U1039 indicates that the vehicle's control module has detected invalid or missing data for the primary vehicle speed signal.

2. What are the common symptoms of code U1039?

Symptoms may include erratic or non-functional speedometer readings, transmission shifting issues, reduced engine performance, or the illumination of the check engine light.

3. What causes the U1039 code to appear?

Common causes include a faulty vehicle speed sensor (VSS), damaged wiring or connectors, issues with the control module, or communication errors between the modules.

4. Can a faulty speed sensor trigger the U1039 code?

Yes, a malfunctioning speed sensor is one of the most common causes of this code.

5. How is the U1039 code diagnosed?

Diagnosis typically involves scanning for additional codes, inspecting the vehicle speed sensor and its wiring, and checking for module communication errors with a diagnostic tool.

6. Can the U1039 code affect transmission performance?

Yes, since vehicle speed data is used for transmission control, this code can cause shifting problems or improper transmission behavior.

7. Is it safe to drive with the U1039 code?

Driving with this code may not be safe, as it can affect speedometer accuracy and transmission performance, which could lead to unsafe driving conditions.

8. How do you fix the U1039 code?

Repairs may involve replacing a faulty speed sensor, repairing or replacing damaged wiring or connectors, updating or reprogramming the control module, or addressing any module communication issues.

9. Can a software update resolve the U1039 code?

In some cases, a software update for the control module may resolve communication errors causing the code.

10. How much does it cost to fix the U1039 code?

Repair costs depend on the root cause but typically range from $100 to $400, including parts and labor, with speed sensor replacements usually on the lower end.