AutoCodes – Chevrolet – B3187 Chevrolet

B3187 Chevrolet Code - Left Rear Window Down Switch Circuit Low

Quick Answer

This Diagnostic Trouble Code (DTC) is generated by a passenger door window switch or a passenger door window switch circuit. Common causes include Faulty Left Rear Window Switch, Left Rear Window Switch harness is open or shorted, Left Rear Window Switch circuit poor electrical connection. 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 Chevrolet indicates Left Rear Window Down Switch Circuit Low.
Common causes: Common causes include Faulty Left Rear Window Switch, Left Rear Window Switch harness is open or shorted, Left Rear Window Switch circuit poor electrical connection.
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.

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Code Popularity 482

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3187 Chevrolet Description

This Diagnostic Trouble Code (DTC) is generated by a passenger door window switch or a passenger door window switch circuit. Each passenger door window switch is mounted to the trim panel of the appropriate passenger door. The circuits and contacts of each passenger door window switch receive battery voltage and ground from the corresponding door module, i.e. Front Passenger Door Module (PDM), Left Rear Door Module (LRDM), or Right Rear Door Module (RRDM). When a passenger door window switch is operated, the switch contacts close and the associated door module interprets the flow of voltage as a specific request to move the window up or down. If conditions are correct for window operation to occur, the door module then powers the associated window motor and circuits to move the window.

OBDII Code B3187 Chevrolet - Left Rear Window Down Switch Circuit Low - AutoCodes.com — B3187 Chevrolet Code - Left Rear Window Down Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3187 Chevrolet?

Faulty Left Rear Window Switch
Left Rear Window Switch harness is open or shorted
Left Rear Window Switch circuit poor electrical connection
Faulty Left Rear Door Module (LRDM)

How to Fix the DTC B3187 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3187 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 Chevrolet Code

1. What are common symptoms of OBDII code B3187 in a Chevrolet related to the left rear window down switch circuit?

The common symptoms include the left rear window not responding to the switch, the window getting stuck in the down position, or erratic window operation.

2. What can cause the OBDII code B3187 in a Chevrolet for the left rear window down switch circuit to trigger?

Possible causes include a faulty window switch, damaged wiring or connectors in the circuit, a malfunctioning window motor, or a problem with the window regulator.

3. How can I diagnose the OBDII code B3187 in a Chevrolet for the left rear window down switch circuit?

Diagnose by checking the window switch for proper functionality, inspecting the wiring and connectors for damage, testing the window motor for proper operation, and examining the window regulator for any issues.

4. Are there any quick repair tips for fixing the OBDII code B3187 in a Chevrolet for the left rear window down switch circuit?

Quick repair tips include checking and replacing any blown fuses related to the window circuit, ensuring proper grounding of the components, and resetting the window's control module.

5. Can a DIY enthusiast fix the OBDII code B3187 in a Chevrolet for the left rear window down switch circuit?

While some simple troubleshooting and repairs can be done by a DIY enthusiast, complex issues like internal motor failures or control module malfunctions may require professional diagnosis and repair.

6. How critical is it to address the OBDII code B3187 for the left rear window down switch circuit in a Chevrolet promptly?

It is important to address this code promptly to ensure the safe operation of the left rear window, prevent further damage to the window components, and maintain the overall functionality of the vehicle.

7. What is the typical cost to repair the OBDII code B3187 in a Chevrolet for the left rear window down switch circuit?

The cost can vary depending on the specific issue causing the code, but it may range from a simple fix like replacing a switch or fuse to a more complex repair involving the window motor or regulator.

8. Can resetting the OBDII system clear the B3187 code in a Chevrolet for the left rear window down switch circuit?

Resetting the OBDII system may clear the code temporarily, but if the underlying issue causing the code is not addressed, it is likely to reappear once the problem is detected again.

9. Are there any recalls or service bulletins related to the OBDII code B3187 in a Chevrolet for the left rear window down switch circuit?

Check with Chevrolet or visit the NHTSA website to see if there are any recalls or service bulletins related to this specific OBDII code for your vehicle model.

10. How can I prevent the OBDII code B3187 from occurring again in a Chevrolet for the left rear window down switch circuit?

Regularly inspect and maintain the window components, avoid overloading the window with excessive force, and address any window operation issues promptly to prevent the recurrence of this OBDII code.