AutoCodes – GMC – U3019 GMC

U3019 GMC 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 GMC 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 545

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

What does this mean?

What are the Possible Causes of the DTC U3019 GMC?

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 GMC?

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 GMC 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 GMC code?

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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 GMC Code

1. What are the common symptoms of OBDII code U3019 GMC?

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

2. What can cause the OBDII code U3019 GMC to appear?

- The code may be triggered by issues such as a faulty control module, wiring problems, or a weak battery voltage.

3. How do I diagnose the Control Module Supply Circuit 3-4 Not Plausible code?

- Diagnosis typically involves checking the wiring and connections related to the control module, testing the battery voltage, and using a scan tool to gather data.

4. Can a weak battery cause the U3019 GMC code to set?

- Yes, a weak or failing battery can lead to voltage fluctuations that may trigger the U3019 code and other related issues.

5. What repair tips can help resolve the U3019 GMC code?

- Repair tips may include inspecting and repairing any damaged wiring, replacing the control module if necessary, and ensuring a strong battery connection.

6. Is it safe to continue driving with the U3019 GMC code present?

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

7. Can a DIY enthusiast fix the U3019 GMC code at home?

- While some basic troubleshooting can be done at home, diagnosing and repairing the underlying issues causing the code may require professional expertise and specialized tools.

8. How much does it typically cost to repair the U3019 GMC code?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Will resetting the trouble codes make the U3019 GMC code disappear?

- Resetting the trouble codes may temporarily clear the warning light, but the underlying issue causing the U3019 code will likely trigger the light to come back on.

10. Can extreme weather conditions affect the appearance of the U3019 GMC code?

- Yes, extreme temperatures or weather conditions can sometimes exacerbate electrical issues that may trigger the U3019 code, so it's important to keep this in mind when diagnosing the problem.