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Engine-Codes – GMC – B318A 2014 GMC Sierra

B318A 2014 GMC Sierra Code - Left Rear Window Switch

Quick Answer

The B318A diagnostic trouble code (DTC) for a 2014 GMC Sierra specifically refers to an issue with the left rear window switch. Common causes include Faulty left rear window switch, Wiring issues in the circuitry connected to the left rear window switch, Defective window motor. 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
B318A 2014 GMC Sierra indicates Left Rear Window Switch.
Common causes
Common causes include Faulty left rear window switch, Wiring issues in the circuitry connected to the left rear window switch, Defective window motor.
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 B318A 2014 GMC Sierra Description

The B318A diagnostic trouble code (DTC) for a 2014 GMC Sierra specifically refers to an issue with the left rear window switch. This code indicates that there is a malfunction or fault detected in the circuitry or operation of the switch that controls the left rear window. The left rear window switch is responsible for sending signals to the window motor to raise or lower the window. When this switch malfunctions, it can lead to issues with controlling the left rear window, potentially causing inconvenience and safety concerns for the vehicle occupants.

OBDII Code B318A 2014 GMC Sierra - Left Rear Window Switch
B318A 2014 GMC Sierra Code - Left Rear Window Switch

Common Causes of B318A 2014 GMC Sierra

  1. Faulty left rear window switch.
  2. Wiring issues in the circuitry connected to the left rear window switch.
  3. Defective window motor.
  4. Corrosion or damage to electrical connections.
  5. Water damage or exposure affecting the left rear window switch.

Symptoms of B318A 2014 GMC Sierra

  1. Inability to control the left rear window from the driver's seat.
  2. Left rear window gets stuck in a certain position.
  3. Intermittent operation of the left rear window.
  4. Unresponsive left rear window switch.

How to Fix B318A 2014 GMC Sierra

  1. Diagnostic: Begin by using a scan tool to confirm the B318A code and pinpoint the exact issue with the left rear window switch.
  2. Inspection: Inspect the left rear window switch, wiring, and connections for any visible damage or signs of wear.
  3. Replacement: If the left rear window switch is faulty, replace it with a new one following manufacturer guidelines.
  4. Repair Wiring: Address any wiring issues or damaged connections by repairing or replacing the affected components.
  5. Test: After the repair, test the left rear window switch to ensure proper functionality and smooth operation.

Cost to Fix B318A 2014 GMC Sierra

The typical repair costs for addressing a B318A code related to the left rear window switch in a 2014 GMC Sierra can range from $150 to $300, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. It's recommended to check local rates for a more accurate 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 B318A 2014 GMC Sierra Code

1. What does the OBDII code B318A mean on a 2014 GMC Sierra?

The code B318A indicates an issue with the left rear window switch circuit, typically related to a short, open circuit, or malfunction in the switch or its wiring.

2. What are the symptoms of the B318A code in a 2014 GMC Sierra?

Symptoms may include the left rear window not responding to commands, intermittent operation, or the switch not illuminating if applicable.

3. What causes the B318A code to appear on a 2014 GMC Sierra?

Potential causes include a faulty left rear window switch, damaged wiring or connectors, or a problem with the body control module (BCM).

4. How do I diagnose the B318A code on my 2014 GMC Sierra?

Start by inspecting the left rear window switch, its wiring, and connectors for damage or corrosion. Use a multimeter to test for continuity and check voltage at the switch.

5. Can I continue driving with the B318A code on my 2014 GMC Sierra?

Yes, the vehicle is safe to drive, but the left rear window may not function properly until the issue is fixed.

6. How do I fix the B318A code on a 2014 GMC Sierra?

Repairs may include replacing the left rear window switch, repairing damaged wiring, cleaning corroded connectors, or reprogramming the BCM if necessary.

7. Is the B318A code a common issue in 2014 GMC Sierra trucks?

While not extremely common, it can occur due to normal wear and tear or environmental factors affecting the switch or wiring.

8. Do I need a professional mechanic to fix the B318A code?

You can attempt basic troubleshooting like inspecting wiring and replacing the switch, but consult a professional if the issue involves the BCM or complex electrical diagnostics.

9. How much does it cost to fix the B318A code on a 2014 GMC Sierra?

Costs vary depending on the repair, ranging from $50 to $150 for a new switch or more if BCM programming or extensive wiring repairs are needed.

10. Will clearing the B318A code fix the problem in my 2014 GMC Sierra?

Clearing the code may temporarily remove it, but the underlying issue must be addressed, or the code will likely return.

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