AutoCodes – GMC – B1390 2015 GMC Sierra

B1390 2015 GMC Sierra Code - Control Module Supply Circuit 1

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 Low battery voltage, Faulty Control Module, Control Module harness is open or shorted. 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: B1390 2015 GMC Sierra indicates Control Module Supply Circuit 1.
Common causes: Common causes include Low battery voltage, Faulty Control Module, Control Module harness is open or shorted.
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 232

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 Jul 11, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1390 2015 GMC Sierra Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Damage to components, and incorrect data can occur when the voltage is out of range. The vehicle has multiple Control Modules that will set this Diagnostic Trouble Code (DTC).

OBDII Code B1390 2015 GMC Sierra - Control Module Supply Circuit 1 - AutoCodes.com — B1390 2015 GMC Sierra Code - Control Module Supply Circuit 1

What does this mean?

What are the Possible Causes of the DTC B1390 2015 GMC Sierra?

Low battery voltage
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC B1390 2015 GMC Sierra?

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 B1390 2015 GMC Sierra 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 B1390 2015 GMC Sierra code?

Need more information on how to fix the B1390 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1390 2015 GMC Sierra 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 B1390 2015 GMC Sierra Code

What does OBDII code B1390 mean for a 2015 GMC Sierra?

OBDII code B1390 indicates a problem with the Control Module Supply Circuit 1, which affects the operation of various electrical components in the vehicle, often related to the body control module.

What are the common symptoms associated with code B1390?

Symptoms may include malfunctioning interior lights, faulty power windows, issues with the vehicleâ€™s central locking system, or trouble with other electronic features.

What could cause the B1390 code to trigger?

Common causes include a short circuit in the wiring harness, a faulty body control module, poor ground connections, or issues with the power supply to the module.

How can I diagnose the B1390 code?

Start by using an OBD-II scanner to confirm the code. Then, inspect the wiring and connectors for any signs of damage, corrosion, or loose connections. Check the body control module and related circuits for proper voltage.

Are there any specific tools needed to troubleshoot code B1390?

Yes, you'll need an OBD-II scanner to read the codes, a multimeter to test voltage and continuity in circuits, and possibly a wiring diagram for the vehicle to trace connections.

What are the potential repair solutions for B1390?

Repairs may include repairing or replacing damaged wiring or connectors, replacing the body control module, or ensuring proper grounding and power supply to the control module.

Can I drive my 2015 GMC Sierra with the B1390 code?

While it may be possible to drive with this code, it could lead to further electrical problems or malfunctions of important features, so itâ€™s advisable to address the issue as soon as possible.

How do I clear the B1390 code after repairs?

After completing the necessary repairs, you can clear the code using an OBD-II scanner. If the issue is resolved, the code should not reappear after a short test drive.

Will ignoring the B1390 code cause further damage to my vehicle?

Yes, ignoring the code can lead to further electrical complications, potentially affecting related systems and leading to more extensive repairs down the line. It's best to address the issue promptly.