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Engine-Codes – GMC – B3187 GMC

B3187 GMC Code - Left Rear Window Down Switch Circuit Low

Quick Answer

The B3187 GMC diagnostic trouble code (DTC) specifically refers to an issue with the Left Rear Window Down Switch Circuit being detected as low. Common causes include Faulty left rear window switch, Damaged wiring or connectors in the left rear window circuit, Short circuit in the wiring. 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
B3187 GMC indicates Left Rear Window Down Switch Circuit Low.
Common causes
Common causes include Faulty left rear window switch, Damaged wiring or connectors in the left rear window circuit, Short circuit in the wiring.
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 14, 2024
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Code B3187 GMC Description

The B3187 GMC diagnostic trouble code (DTC) specifically refers to an issue with the Left Rear Window Down Switch Circuit being detected as low. This means that there is an electrical problem with the switch that controls the left rear window in the vehicle. The switch is not sending the expected signal or voltage level, which could prevent the window from operating correctly.

OBDII Code B3187 GMC - Left Rear Window Down Switch Circuit Low
B3187 GMC Code - Left Rear Window Down Switch Circuit Low

Common Causes of B3187 GMC

  1. Faulty left rear window switch.
  2. Damaged wiring or connectors in the left rear window circuit.
  3. Short circuit in the wiring.
  4. Defective left rear window motor or regulator.
  5. Corrosion or moisture affecting the electrical components.

Symptoms of B3187 GMC

  1. Left rear window not responding to switch commands.
  2. Window only moves in one direction or intermittently.
  3. Unusual noises coming from the window when attempting to operate it.
  4. Window gets stuck in the down position.

How to Fix B3187 GMC

  1. Begin by inspecting the left rear window switch for any visible damage or signs of wear. Replace the switch if necessary.
  2. Check the wiring and connectors in the left rear window circuit for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the left rear window motor and regulator for proper operation. Replace if faulty.
  4. Clear the diagnostic trouble code from the vehicle's computer using a scan tool.
  5. Test the left rear window to ensure it operates correctly after the repair.

Cost to Fix B3187 GMC

The typical repair costs for addressing the B3187 GMC code can vary depending on the specific cause of the issue. In general, replacing a faulty window switch can cost between $50 and $150, while repairing damaged wiring or connectors may range from $100 to $300. If the window motor or regulator needs replacement, the cost can be higher, typically ranging from $200 to $500 or more. Labor costs at auto repair shops can add to the total expense, with hourly rates typically ranging from $80 to $150. It's advisable to consult with a professional technician for a more accurate estimate based on the specific vehicle make and model.

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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 B3187 GMC Code

1. What are the common symptoms of OBDII code B3187 GMC?

- The common symptoms include the left rear window not functioning properly, the window being stuck in the down position, and issues with the window switch.

2. What are some possible causes of the B3187 GMC code?

- Possible causes include a faulty left rear window switch, damaged wiring or connectors in the circuit, or a defective window motor.

3. How can I diagnose the issue related to the Left Rear Window Down Switch Circuit Low code?

- Use a diagnostic scanner to read the code and perform a visual inspection of the left rear window switch, wiring, and connectors to look for any visible damage.

4. Can a DIY enthusiast repair the B3187 GMC code at home?

- Depending on the specific cause, DIY repairs may be possible, such as replacing a faulty switch or repairing damaged wiring. However, for complex issues, it's recommended to seek professional help.

5. Are there any quick fixes for the B3187 GMC code?

- In some cases, resetting the OBDII code using a scanner may temporarily resolve the issue, but it's important to address the underlying cause to prevent the code from reappearing.

6. Is it safe to continue driving with the B3187 GMC code triggered?

- It is generally safe to drive with this code, but it's important to address the issue promptly to avoid further damage to the window system or potential safety hazards.

7. How much does it typically cost to repair the Left Rear Window Down Switch Circuit Low issue?

- Repair costs can vary depending on the cause of the problem, but it may range from a simple switch replacement costing around $50 to more complex repairs involving wiring or motor replacement costing several hundred dollars.

8. Will resetting the OBDII code make it go away permanently?

- Resetting the code without fixing the underlying issue will not make it go away permanently. The code is likely to reappear once the problem persists.

9. Can extreme weather conditions cause the B3187 GMC code to trigger?

- Extreme weather conditions can potentially exacerbate existing issues with the window switch circuit, leading to the triggering of the B3187 code.

10. How long does it typically take to repair the Left Rear Window Down Switch Circuit Low problem?

- Repair times can vary based on the complexity of the issue and the availability of parts, but simple repairs like switch replacement may take an hour or two, while more involved repairs could take longer.

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