AutoCodes – Chevrolet – U3019 Chevrolet

U3019 Chevrolet 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 Chevrolet 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.

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Code Popularity 619

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

What does this mean?

What are the Possible Causes of the DTC U3019 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

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Get the U3019 Chevrolet 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 U3019 Chevrolet Code

1. What does OBDII code U3019 mean on a Chevrolet?

U3019 indicates an issue with the Control Module Supply Circuit 3-4, specifically that the power supply voltage to one or more control modules is not within acceptable parameters.

2. What are the common symptoms of OBDII code U3019?

Symptoms may include the check engine light or other warning lights turning on, erratic electrical behavior, intermittent power loss to certain systems, or failure of specific control modules.

3. What causes OBDII code U3019 on a Chevrolet?

Common causes include a weak or faulty battery, corroded or loose electrical connections, damaged wiring in the supply circuit, or a malfunctioning control module.

4. Can a weak battery trigger code U3019?

Yes, a weak or failing battery can cause voltage irregularities that may trigger the U3019 code.

5. How can I diagnose the cause of code U3019?

Start by checking the battery voltage and health, inspecting all related wiring and connectors for damage or corrosion, and testing the affected control moduleâ€™s functionality.

6. Is U3019 a serious issue?

It can be serious if it leads to the failure of critical control modules or systems. Prompt diagnosis and repair are recommended to avoid further electrical issues.

7. What repairs are commonly needed for U3019?

Repairs may include replacing the battery, cleaning or repairing corroded connections, repairing damaged wiring, or replacing a faulty control module.

8. Can I clear code U3019 without fixing the issue?

Clearing the code without addressing the root cause may only result in the code returning. Always resolve the underlying problem first.

9. Will U3019 affect vehicle performance?

Depending on the control modules impacted, U3019 could affect performance, including systems like the engine, transmission, or other electrical components.

10. Can a professional scan tool help diagnose U3019?

Yes, a professional scan tool can read detailed freeze frame data, monitor live voltage readings, and pinpoint which module or circuit is affected for a more accurate diagnosis.