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B1400 2016 GMC Sierra Code - Control Module Supply Circuit 2

Quick Answer

The B1400 diagnostic trouble code for a 2016 GMC Sierra relates to the Control Module Supply Circuit 2. Common causes include Wiring harness issues, such as a short circuit or open circuit, Faulty connectors or terminals in the control module supply circuit, Blown fuse related to the power supply for the 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
B1400 2016 GMC Sierra indicates Control Module Supply Circuit 2.
Common causes
Common causes include Wiring harness issues, such as a short circuit or open circuit, Faulty connectors or terminals in the control module supply circuit, Blown fuse related to the power supply for the 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 17, 2024
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Code B1400 2016 GMC Sierra Description

The B1400 diagnostic trouble code for a 2016 GMC Sierra relates to the Control Module Supply Circuit 2. This code indicates that there is a malfunction in the circuit responsible for supplying power to a specific control module in the vehicle. Control modules are essential components that manage various systems within the vehicle, such as the engine, transmission, and emissions control. In this case, Control Module Supply Circuit 2 refers to the power supply for a particular control module, which could be related to functions like the airbag system, anti-lock brakes, or other critical systems.

OBDII Code B1400 2016 GMC Sierra - Control Module Supply Circuit 2
B1400 2016 GMC Sierra Code - Control Module Supply Circuit 2

Common Causes of B1400 2016 GMC Sierra

  1. Wiring harness issues, such as a short circuit or open circuit
  2. Faulty connectors or terminals in the control module supply circuit
  3. Blown fuse related to the power supply for the control module
  4. Defective control module requiring replacement
  5. Problems with the power supply source, such as a faulty relay or battery connection

Symptoms of B1400 2016 GMC Sierra

  1. Illumination of warning lights on the dashboard related to the affected system
  2. Loss of functionality in the system controlled by the affected control module
  3. Erratic behavior or malfunctions in the vehicle's operation
  4. Potential safety hazards if critical systems are impacted

How to Fix B1400 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the control module supply circuit, checking for any visible damage or loose connections.
  2. Test the power supply to the control module using a multimeter to ensure that the correct voltage is reaching the module.
  3. Inspect the wiring harness and connectors for any signs of wear, corrosion, or damage, repairing or replacing as necessary.
  4. Check and replace any blown fuses related to the control module supply circuit.
  5. If the issue persists, consider replacing the control module itself after confirming that the power supply is functioning correctly.

Cost to Fix B1400 2016 GMC Sierra

The typical repair costs for addressing a B1400 code related to the Control Module Supply Circuit 2 in a 2016 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, parts and labor for this type of repair could range from $200 to $500 or more. It's important to note that diagnostic time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Rates typically range from $80 to $150 per hour, with higher rates in metropolitan areas or at dealerships and lower rates at independent shops. For a more accurate estimate, it's advisable to consult with a local auto repair shop.

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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 B1400 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B1400 in a 2016 GMC Sierra?

The common symptoms of OBDII code B1400 in a 2016 GMC Sierra include issues with the vehicle's electrical system, such as intermittent power loss, dashboard warning lights illuminating, or difficulty starting the engine.

2. What does OBDII code B1400 indicate in a 2016 GMC Sierra?

OBDII code B1400 in a 2016 GMC Sierra indicates a problem with the Control Module Supply Circuit 2, specifically related to the power supply to a control module in the vehicle.

3. What are the possible causes of OBDII code B1400 in a 2016 GMC Sierra?

Possible causes of OBDII code B1400 in a 2016 GMC Sierra include a faulty control module, damaged wiring or connectors in the supply circuit, or a malfunctioning power source.

4. How can I diagnose OBDII code B1400 in my 2016 GMC Sierra?

To diagnose OBDII code B1400 in a 2016 GMC Sierra, you can use an OBDII scanner to retrieve the specific fault code, inspect the wiring and connectors in the Control Module Supply Circuit 2, and test the power supply to the affected control module.

5. Can OBDII code B1400 in a 2016 GMC Sierra be fixed at home?

Fixing OBDII code B1400 in a 2016 GMC Sierra depends on the underlying cause. Simple fixes like checking and tightening connections may be done at home, but more complex issues like replacing a control module may require professional help.

6. Is it safe to continue driving with OBDII code B1400 in a 2016 GMC Sierra?

It is not recommended to continue driving with OBDII code B1400 in a 2016 GMC Sierra, as it could lead to further electrical system malfunctions or potential safety hazards. It's best to address the issue promptly.

7. How much does it typically cost to repair OBDII code B1400 in a 2016 GMC Sierra?

The cost to repair OBDII code B1400 in a 2016 GMC Sierra can vary depending on the root cause of the issue. Simple fixes like replacing a fuse may be inexpensive, while more complex repairs involving control module replacement can be costly.

8. Are there any preventative measures to avoid OBDII code B1400 in a 2016 GMC Sierra?

Regular vehicle maintenance, including checking the electrical system for loose connections and ensuring proper power supply, can help prevent issues like OBDII code B1400 in a 2016 GMC Sierra.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code B1400 in a 2016 GMC Sierra?

A DIY enthusiast with basic automotive knowledge may be able to address simple causes of OBDII code B1400, such as checking and securing connections. However, complex issues may require professional expertise.

10. How long does it typically take to repair OBDII code B1400 in a 2016 GMC Sierra?

The time to repair OBDII code B1400 in a 2016 GMC Sierra varies based on the cause of the issue and the complexity of the repair. Simple fixes can be completed quickly, while more involved repairs may take longer.

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