AutoCodes – Generic – U3019

U3019 Code - Control Module Supply Circuit 3-4 Not Plausible

Quick Answer

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Faulty Control Module setting the code, Control Module harness is open or shorted, Control 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: U3019 indicates Control Module Supply Circuit 3-4 Not Plausible.
Common causes: Common causes include Faulty Control Module setting the code, Control Module harness is open or shorted, Control 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.

Save to My Repairs My Repairs

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

Code Popularity 888

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 Jun 18, 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 U3019 Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. With the ignition is ON, the Diagnostic Trouble Code (DTC) will set when the control module or sensor detects a system voltage of less than approximately 9 V for approximately 5 s.

OBDII Code U3019 - Control Module Supply Circuit 3-4 Not Plausible - AutoCodes.com — U3019 Code - Control Module Supply Circuit 3-4 Not Plausible

What does this mean?

What are the Possible Causes of the DTC U3019?

Faulty Control Module setting the code
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U3019?

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 U3019 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 U3019 code?

Need more information on how to fix the U3019 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U3019 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U3019 Buick — Control Module Supply Circuit 3-4 Not Plausible
U3019 Cadillac — Control Module Supply Circuit 3-4 Not Plausible
U3019 Chevrolet — Control Module Supply Circuit 3-4 Not Plausible
U3019 GMC — Control Module Supply Circuit 3-4 Not Plausible

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 U3019 Code

1. What are common symptoms of OBDII code U3019 (Control Module Supply Circuit 3-4 Not Plausible)?

- Common symptoms include engine stalling, rough idling, poor acceleration, and illuminated warning lights on the dashboard.

2. What are possible causes of OBDII code U3019?

- Possible causes include faulty control module, damaged wiring or connectors in the supply circuit, low battery voltage, or a malfunctioning powertrain control module.

3. How can I diagnose OBDII code U3019?

- Diagnosis involves using a diagnostic scanner to retrieve the trouble codes, inspecting the wiring and connectors in the supply circuit, and testing the control modules for proper functioning.

4. Can I continue driving with OBDII code U3019 present?

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

5. How can I repair OBDII code U3019?

- Repair may involve replacing the faulty control module, repairing or replacing damaged wiring or connectors, addressing any issues with the power supply, and clearing the trouble codes.

6. Is it possible to reset OBDII code U3019 without fixing the underlying issue?

- While you can clear the trouble code temporarily, it is important to address the underlying issue to prevent further problems and ensure the vehicle operates correctly.

7. Will OBDII code U3019 cause my vehicle to fail an emissions test?

- Yes, OBDII code U3019 can indicate a problem with the emissions control system, which may cause your vehicle to fail an emissions test.

8. Are there any DIY repairs I can attempt for OBDII code U3019?

- DIY repairs for this code may include checking and tightening electrical connections, inspecting for visible wire damage, and replacing the control module if necessary.

9. How much does it typically cost to repair OBDII code U3019 at a professional auto repair shop?

- The cost to repair this code can vary depending on the specific cause, but it may range from $200 to $500 or more, including parts and labor.

10. Can a low battery voltage trigger OBDII code U3019?

- Yes, low battery voltage can disrupt the control module supply circuit, leading to the triggering of OBDII code U3019. It is important to ensure the battery is in good condition to prevent this issue.