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B356A 2017 GMC Sierra Code - Vehicle Direction Warning Switch Circuit

Quick Answer

The B356A diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Vehicle Direction Warning Switch Circuit. Common causes include Faulty direction warning switch, Damaged wiring or connectors in the circuit, Blown fuse related to the turn signal system. 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 2017 GMC Sierra indicates Vehicle Direction Warning Switch Circuit.
Common causes
Common causes include Faulty direction warning switch, Damaged wiring or connectors in the circuit, Blown fuse related to the turn signal system.
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 13, 2024
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Code B356A 2017 GMC Sierra Description

The B356A diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Vehicle Direction Warning Switch Circuit. This code indicates a problem with the circuit that controls the vehicle's direction warning switch. The direction warning switch is a critical component that allows the driver to indicate their intention to change lanes or make a turn, alerting other drivers on the road. When this circuit malfunctions, it can lead to a loss of functionality in the direction warning system, compromising the safety of the vehicle and its occupants.

OBDII Code B356A 2017 GMC Sierra - Vehicle Direction Warning Switch Circuit
B356A 2017 GMC Sierra Code - Vehicle Direction Warning Switch Circuit

Common Causes of B356A 2017 GMC Sierra

  1. Faulty direction warning switch
  2. Damaged wiring or connectors in the circuit
  3. Blown fuse related to the turn signal system
  4. Defective turn signal relay
  5. Corrosion or moisture in the electrical connections

Symptoms of B356A 2017 GMC Sierra

  1. Non-functioning turn signals
  2. Turn signals flashing erratically
  3. Turn signals not turning off after completing a turn
  4. Dashboard indicator for turn signals not illuminating
  5. Audible clicking noise from turn signal relay

How to Fix B356A 2017 GMC Sierra

  1. Diagnose the issue using a scan tool to retrieve the DTC
  2. Inspect the direction warning switch, wiring, and connectors for damage
  3. Test the turn signal relay for proper operation
  4. Replace any faulty components, such as the direction warning switch or damaged wiring
  5. Clear the DTC and test the turn signal system to ensure proper functionality

Cost to Fix B356A 2017 GMC Sierra

The cost of repairing a B356A DTC for a 2017 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $300. Overall, the total repair cost for addressing this code typically falls in the range of $150 to $500. However, it's important to note that these estimates are rough averages and actual costs may vary based on factors such as location, vehicle make and model, and the rates charged by individual auto repair shops. It's recommended to obtain a detailed quote from a trusted mechanic or dealership to get a more accurate understanding of the repair costs for this issue.

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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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B356A in a 2017 GMC Sierra?

- Common symptoms include the vehicle direction warning switch not functioning properly, dashboard warning lights related to the switch circuit, and potential loss of directional signal functionality.

2. What can cause the OBDII code B356A in a 2017 GMC Sierra?

- The code may be triggered by issues such as a faulty vehicle direction warning switch, damaged wiring in the switch circuit, or a malfunctioning control module.

3. How can I diagnose the cause of OBDII code B356A in my 2017 GMC Sierra?

- Diagnose the issue by inspecting the vehicle direction warning switch for physical damage, checking the wiring for any signs of wear or disconnection, and using a diagnostic scanner to read the code and related data.

4. Is it safe to continue driving my 2017 GMC Sierra with OBDII code B356A present?

- It is not recommended to drive the vehicle with this code present, as it can affect the proper functioning of the vehicle's directional signals, posing a safety risk on the road.

5. How can I repair OBDII code B356A in my 2017 GMC Sierra?

- Repair options include replacing the faulty vehicle direction warning switch, repairing any damaged wiring in the switch circuit, or reprogramming the control module if necessary.

6. Can a DIY enthusiast fix OBDII code B356A in a 2017 GMC Sierra?

- While some straightforward repairs like replacing the switch may be possible for DIY enthusiasts, diagnosing and fixing complex electrical issues should be left to experienced professionals.

7. Are there any recalls or technical service bulletins related to OBDII code B356A in a 2017 GMC Sierra?

- Check with your local GMC dealership or visit the manufacturer's website to inquire about any relevant recalls or technical service bulletins related to this specific OBDII code.

8. How much can I expect to pay for repairing OBDII code B356A in my 2017 GMC Sierra?

- Repair costs can vary depending on the exact cause of the issue, but you can expect to pay for parts and labor, with the total cost ranging from a few hundred to over a thousand dollars.

9. Will resetting the OBDII code B356A in a 2017 GMC Sierra make it go away permanently?

- Resetting the code may temporarily clear the warning lights, but if the underlying issue is not addressed and repaired, the code is likely to reappear once the problem resurfaces.

10. How long does it typically take to repair OBDII code B356A in a 2017 GMC Sierra?

- The repair time can vary depending on the complexity of the issue and the availability of parts. Simple repairs may take a few hours, while more involved diagnostics and fixes could take a day or longer.

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