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B318A 2016 GMC Sierra Code - Left Rear Window Switch

Quick Answer

The B318A diagnostic trouble code (DTC) for a 2016 GMC Sierra specifically refers to an issue with the left rear window switch. Common causes include Faulty left rear window switch, Damaged wiring or connectors in the circuit, Malfunctioning window motor or regulator. 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 2016 GMC Sierra indicates Left Rear Window Switch.
Common causes
Common causes include Faulty left rear window switch, Damaged wiring or connectors in the circuit, Malfunctioning window motor or regulator.
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 B318A 2016 GMC Sierra Description

The B318A diagnostic trouble code (DTC) for a 2016 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 circuit related to the left rear window switch. The left rear window switch is responsible for controlling the operation of the left rear window in the vehicle. When this switch is not functioning properly, it can lead to various issues with the window's operation.

OBDII Code B318A 2016 GMC Sierra - Left Rear Window Switch
B318A 2016 GMC Sierra Code - Left Rear Window Switch

Common Causes of B318A 2016 GMC Sierra

  1. Faulty left rear window switch.
  2. Damaged wiring or connectors in the circuit.
  3. Malfunctioning window motor or regulator.
  4. Problem with the body control module.

Symptoms of B318A 2016 GMC Sierra

  1. Left rear window not responding to switch inputs.
  2. Left rear window stuck in a certain position.
  3. Left rear window moving erratically.
  4. Left rear window not operating at all.

How to Fix B318A 2016 GMC Sierra

  1. Begin by diagnosing the root cause of the issue using a scan tool to retrieve the DTC and inspecting the left rear window switch, wiring, and related components.
  2. Replace the faulty left rear window switch if necessary.
  3. Repair or replace any damaged wiring or connectors in the circuit.
  4. Test the operation of the left rear window to ensure proper functionality.
  5. Clear the DTC and perform a final test drive to confirm that the issue has been resolved.

Cost to Fix B318A 2016 GMC Sierra

The typical repair costs for addressing the B318A code related to the left rear window switch on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the cost of replacing a window switch can range from $100 to $200, while addressing wiring or motor/regulator issues may increase the total cost. Additionally, labor rates at auto repair shops can range from $80 to $150 per hour, with rates potentially higher in metropolitan areas or at dealerships. It is advisable to check with local shops for a more accurate estimate based on the specific circumstances of the repair.

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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 2016 GMC Sierra Code

1. What does OBDII code B318A mean for a 2016 GMC Sierra Left Rear Window Switch?

The code B318A indicates a malfunction in the left rear window switch of a 2016 GMC Sierra.

2. What are the common symptoms of OBDII code B318A in a 2016 GMC Sierra Left Rear Window Switch?

Common symptoms include the left rear window being inoperable or functioning intermittently, the switch not responding to commands, or the window getting stuck in one position.

3. What are some possible causes of OBDII code B318A in a 2016 GMC Sierra Left Rear Window Switch?

Causes can include a faulty window switch, damaged wiring or connectors, a blown fuse, or issues with the window regulator or motor.

4. How can I diagnose the issue related to OBDII code B318A in my 2016 GMC Sierra Left Rear Window Switch?

You can start by checking the fuse related to the left rear window, inspecting the wiring and connectors for any damage, and testing the switch for proper functionality. If needed, a professional diagnostic tool can help pinpoint the exact issue.

5. What are some DIY repair tips for resolving OBDII code B318A in a 2016 GMC Sierra Left Rear Window Switch?

You may try cleaning the switch contacts, replacing the fuse if needed, or repairing any damaged wiring yourself. For more complex issues, it's recommended to consult a qualified mechanic.

6. Can I continue to drive my 2016 GMC Sierra with OBDII code B318A affecting the Left Rear Window Switch?

While the vehicle may still be operable, it's advisable to address the issue promptly to ensure the safety and functionality of the left rear window.

7. Is it safe to reset the OBDII code B318A without fixing the underlying problem in my 2016 GMC Sierra Left Rear Window Switch?

Resetting the code without resolving the root cause may temporarily clear the warning light, but the issue will likely reoccur. It's best to address the problem to prevent further complications.

8. How much does it typically cost to repair OBDII code B318A in a 2016 GMC Sierra Left Rear Window Switch?

The cost of repair can vary depending on the exact cause of the issue. Simple fixes like replacing a fuse or switch may be relatively inexpensive, while more complex problems could require professional intervention and incur higher costs.

9. Can a faulty left rear window switch trigger other OBDII codes in a 2016 GMC Sierra?

While it's possible for related issues to trigger additional codes, the B318A code specifically pertains to problems with the left rear window switch. Other codes may appear if there are separate malfunctions in the vehicle's systems.

10. Should I seek professional help to address OBDII code B318A in my 2016 GMC Sierra Left Rear Window Switch?

If you're unsure about diagnosing or repairing the issue yourself, or if the problem is complex, it's recommended to seek assistance from a qualified mechanic or dealership to ensure proper resolution.

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