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B356A 2015 GMC Sierra Code - Vehicle Direction Warning Switch Circuit

Quick Answer

The B356A diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the vehicle direction warning switch circuit. Common causes include Faulty direction warning switch, Wiring issues or shorts in the circuit, Corrosion or damage to electrical connectors. 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
B356A 2015 GMC Sierra indicates Vehicle Direction Warning Switch Circuit.
Common causes
Common causes include Faulty direction warning switch, Wiring issues or shorts in the circuit, Corrosion or damage to electrical connectors.
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 15, 2024
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Code B356A 2015 GMC Sierra Description

The B356A diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the vehicle direction warning switch circuit. This code specifically relates to issues with the switch that controls the vehicle's turn signals, hazard lights, and potentially other directional indicators. The direction warning switch is a crucial component for safe driving, as it allows the driver to signal their intentions to other road users, thereby preventing accidents and ensuring smooth traffic flow.

OBDII Code B356A 2015 GMC Sierra - Vehicle Direction Warning Switch Circuit
B356A 2015 GMC Sierra Code - Vehicle Direction Warning Switch Circuit

Common Causes of B356A 2015 GMC Sierra

  1. Faulty direction warning switch
  2. Wiring issues or shorts in the circuit
  3. Corrosion or damage to electrical connectors
  4. Faulty body control module (BCM)
  5. Water damage or exposure to moisture

Symptoms of B356A 2015 GMC Sierra

  1. Turn signals not working properly or intermittently
  2. Hazard lights not functioning
  3. Dashboard indicator lights related to direction warning system illuminated
  4. ESC or traction control system malfunctions

How to Fix B356A 2015 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to retrieve the trouble codes and pinpoint the exact source of the problem.
  2. Inspect the direction warning switch for any visible damage or signs of wear. Replace the switch if necessary.
  3. Check the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as needed.
  4. Test the body control module (BCM) to ensure it is functioning correctly. Replace if found to be faulty.
  5. Clear the trouble codes from the vehicle's computer system and test the direction warning system to ensure proper functionality.

Cost to Fix B356A 2015 GMC Sierra

The cost of repairing a vehicle direction warning switch circuit issue can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, the parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total cost of addressing this issue may fall between $150 and $500. It is important to note that these estimates are general guidelines, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at the repair facility. It is recommended to obtain a detailed quote from a trusted auto repair shop for a more accurate cost estimate.

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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 B356A 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B356A in a 2015 GMC Sierra?

- Common symptoms include the vehicle direction warning switch not functioning properly, the warning light staying on, and potential loss of directional signal functionality.

2. What can cause the OBDII code B356A to appear in a 2015 GMC Sierra?

- The code B356A typically indicates a fault in the vehicle direction warning switch circuit, which can be caused by a malfunctioning switch, wiring issues, or a faulty control module.

3. How can I diagnose the issue related to OBDII code B356A in my 2015 GMC Sierra?

- To diagnose the problem, you can use a diagnostic scanner to retrieve the trouble codes, inspect the vehicle direction warning switch and circuitry for any visible damage, and perform electrical tests as needed.

4. Can I still drive my 2015 GMC Sierra with OBDII code B356A present?

- It is generally not recommended to drive the vehicle with unresolved OBDII code B356A, as it can affect the proper functioning of the vehicle's directional signals and compromise safety.

5. How can I repair the OBDII code B356A in my 2015 GMC Sierra?

- The repair process may involve replacing the faulty vehicle direction warning switch, repairing any damaged wiring or connectors, or reprogramming the control module to address the issue.

6. Is it possible to reset the OBDII code B356A in a 2015 GMC Sierra without fixing the underlying problem?

- While you can clear the trouble code with a diagnostic scanner, it is crucial to address the root cause of the issue to prevent the code from reoccurring and ensure proper vehicle functionality.

7. Are there any common DIY fixes for OBDII code B356A on a 2015 GMC Sierra?

- DIY fixes may include checking and tightening loose connections, cleaning corroded terminals, and inspecting the switch for debris or water damage before considering professional repair options.

8. Will OBDII code B356A in a 2015 GMC Sierra cause the vehicle to fail an emissions test?

- The code B356A is related to the vehicle direction warning switch circuit and may not directly impact emissions, but it is still essential to address the issue to maintain overall vehicle health and safety.

9. How long does it typically take to repair OBDII code B356A in a 2015 GMC Sierra?

- The repair time can vary depending on the specific cause of the issue, but it may take a few hours to a day for diagnosis, parts replacement, and testing to resolve the OBDII code B356A.

10. Can a mechanic help me fix OBDII code B356A in my 2015 GMC Sierra, or is it a job I can do myself?

- A qualified mechanic with experience in diagnosing and repairing electrical issues is recommended for addressing OBDII code B356A to ensure the problem is correctly identified and resolved.

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