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B1380 2015 GMC Sierra Code - Control Module Ignition Accessory Circuit

Quick Answer

The B1380 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Control Module Ignition Accessory Circuit. Common causes include Faulty ignition switch, Wiring or connector issues in the ignition accessory circuit, Defective control module. 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
B1380 2015 GMC Sierra indicates Control Module Ignition Accessory Circuit.
Common causes
Common causes include Faulty ignition switch, Wiring or connector issues in the ignition accessory circuit, Defective control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code B1380 2015 GMC Sierra Description

The B1380 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Control Module Ignition Accessory Circuit. This code indicates a problem with the circuit that controls the ignition accessory function in the vehicle. The ignition accessory circuit is responsible for providing power to various electrical components in the vehicle when the ignition is in the accessory position, such as the radio, power windows, and interior lights.

OBDII Code B1380 2015 GMC Sierra - Control Module Ignition Accessory Circuit
B1380 2015 GMC Sierra Code - Control Module Ignition Accessory Circuit

Common Causes of B1380 2015 GMC Sierra

  1. Faulty ignition switch.
  2. Wiring or connector issues in the ignition accessory circuit.
  3. Defective control module.
  4. Blown fuse related to the ignition accessory circuit.
  5. Water or moisture damage to the circuit components.

Symptoms of B1380 2015 GMC Sierra

  1. The radio or interior lights may not turn on when the ignition is in the accessory position.
  2. Power windows may not work properly or may be inoperable.
  3. The vehicle's key may get stuck in the ignition.
  4. The vehicle may experience intermittent electrical issues, such as flickering lights.

How to Fix B1380 2015 GMC Sierra

  1. Begin by conducting a thorough inspection of the ignition accessory circuit, including the ignition switch, wiring, connectors, and control module.
  2. Test the voltage and continuity in the circuit to identify any faults.
  3. Replace any damaged or faulty components, such as the ignition switch, wiring harness, connectors, or control module.
  4. Clear the DTC from the vehicle's onboard computer using a diagnostic scan tool.
  5. Test the repaired circuit to ensure all accessory components are functioning properly.

Cost to Fix B1380 2015 GMC Sierra

The cost of repairing a Control Module Ignition Accessory Circuit issue can vary depending on the specific cause of the problem and the extent of the repair needed. In general, replacing an ignition switch or control module can cost anywhere from $150 to $500, while addressing wiring or connector issues may range from $100 to $300. Labor costs can add an additional $80 to $150 per hour, with the total cost of repairs potentially reaching $500 to $1000 or more. It's important to consult with a qualified mechanic to obtain an accurate estimate based on the specific circumstances of your vehicle.

What does this mean?

Tech Notes for B1380 2015 GMC Sierra

B1380:01 Control Module Ignition Accessory Circuit Short to Battery
B1380:04 Control Module Ignition Accessory Circuit Short to Ground or Open




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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 B1380 2015 GMC Sierra Code

1. What does the OBDII code B1380 mean on a 2015 GMC Sierra?

The B1380 code indicates an issue with the Control Module Ignition Accessory Circuit, which manages power to certain electrical components when the ignition is in the accessory position.

2. What are the common symptoms of a B1380 code in a 2015 GMC Sierra?

Common symptoms include non-functional accessories like the radio or power windows, issues turning on accessory mode, or the battery draining unexpectedly.

3. What causes the B1380 code to appear?

This code is typically caused by a faulty ignition switch, damaged wiring or connectors in the ignition accessory circuit, or a malfunction in the control module.

4. Can a weak battery trigger the B1380 code?

Yes, a weak or failing battery can sometimes lead to insufficient power in the ignition accessory circuit, potentially triggering this code.

5. How can I diagnose the B1380 code on my GMC Sierra?

Start by checking the ignition switch, fuses, and wiring in the accessory circuit for damage or corrosion. Use a scan tool to monitor the circuit's voltage and confirm module communication.

6. Is the B1380 code serious, and can I drive with it?

While the vehicle may still be drivable, the code indicates issues with the accessory circuit that could lead to further electrical problems if not addressed promptly.

7. How do I fix the B1380 code on a 2015 GMC Sierra?

Repairs may include replacing the ignition switch, repairing or replacing damaged wiring, inspecting and replacing faulty fuses, or reprogramming the control module if necessary.

8. How much does it cost to repair a B1380 code on a GMC Sierra?

Repair costs can range from $100 to $500 depending on whether you need to replace the ignition switch, repair wiring, or reprogram the control module.

9. Can a DIYer fix the B1380 code on a GMC Sierra?

Yes, if you’re comfortable inspecting wiring, fuses, and the ignition switch, you can attempt the repair. However, module reprogramming or advanced diagnostics may require professional tools.

10. Will clearing the B1380 code with a scan tool fix the issue?

Clearing the code may temporarily remove it, but the underlying issue must be resolved to prevent the code from returning.

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