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Engine-Codes – GMC – B318A 2017 GMC Sierra

B318A 2017 GMC Sierra Code - Left Rear Window Switch

Quick Answer

The B318A diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the left rear window switch. Common causes include Faulty left rear window switch, Wiring issues or loose connections in the switch circuit, 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 2017 GMC Sierra indicates Left Rear Window Switch.
Common causes
Common causes include Faulty left rear window switch, Wiring issues or loose connections in the switch circuit, 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 11, 2024
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Code B318A 2017 GMC Sierra Description

The B318A diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the left rear window switch. This code indicates a malfunction in the switch that controls the left rear window of the vehicle. The switch is responsible for sending signals to the window motor to raise or lower the window. When this code is triggered, it typically means that there is an electrical issue with the switch or its wiring, leading to a failure in controlling the left rear window.

OBDII Code B318A 2017 GMC Sierra - Left Rear Window Switch
B318A 2017 GMC Sierra Code - Left Rear Window Switch

Common Causes of B318A 2017 GMC Sierra

  1. Faulty left rear window switch.
  2. Wiring issues or loose connections in the switch circuit.
  3. Defective window motor.
  4. Water damage or corrosion affecting the electrical components.
  5. General wear and tear from regular use of the switch.

Symptoms of B318A 2017 GMC Sierra

  1. Left rear window does not respond to switch inputs.
  2. Window moves intermittently or gets stuck while operating.
  3. Switch feels unresponsive or loose when pressed.
  4. Window moves in the wrong direction when the switch is activated.

How to Fix B318A 2017 GMC Sierra

  1. Diagnose the issue using a scan tool to confirm the B318A code and pinpoint the exact cause.
  2. Inspect the left rear window switch for any visible damage or signs of malfunction.
  3. Check the wiring and connections associated with the switch for loose connections or corrosion.
  4. Test the window motor to determine if it is functioning properly or needs replacement.
  5. Replace the faulty switch, repair any wiring issues, or replace the window motor as necessary to resolve the problem.

Cost to Fix B318A 2017 GMC Sierra

The typical repair costs for addressing a B318A code related to the left rear window switch on a 2017 GMC Sierra can range from $150 to $300, including parts and labor. However, actual costs may vary depending on the specific diagnosis and repair needed, as well as the labor rates at auto repair shops. It is recommended to consult with a professional mechanic for an accurate estimate based on your location and vehicle details.

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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 2017 GMC Sierra Code

What does OBDII code B318A mean for a 2017 GMC Sierra?

B318A indicates a problem with the left rear window switch, which may affect the operation of the window.

What symptoms might I experience with code B318A?

Symptoms include the left rear window not functioning, intermittent operation, or the window switch not responding.

What could cause the B318A code to trigger?

Possible causes include a faulty left rear window switch, wiring issues, or a problem with the body control module.

How can I diagnose the issue related to code B318A?

Start by checking the left rear window switch for proper operation, inspecting the wiring for any damage, and using a multimeter to test for continuity.

Can a bad window motor cause OBDII code B318A?

While the window motor could cause operational issues, code B318A specifically refers to the window switch. However, it’s important to check all related components.

What repairs are typically needed to fix code B318A?

Repairs may involve replacing the left rear window switch, repairing any damaged wiring, or reprogramming the body control module if necessary.

Is it safe to drive a vehicle with code B318A?

While it may be safe to drive, the left rear window may not operate, which could be a safety concern if you need to use it.

Can I reset the code B318A myself?

Yes, you can clear the code using an OBDII scanner, but it’s advisable to diagnose and fix the underlying issue first.

Should I take my GMC Sierra to a dealership for this code?

While dealerships have specialized knowledge, a qualified mechanic can also diagnose and repair issues related to code B318A effectively.

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