AutoCodes – GMC – B3287 GMC

B3287 GMC Code - Left Rear Window Express Up or Down 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: B3287 GMC indicates Left Rear Window Express Up or Down 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 475

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 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3287 GMC 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 B3287 GMC - Left Rear Window Express Up or Down Circuit Low - AutoCodes.com — B3287 GMC Code - Left Rear Window Express Up or Down Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3287 GMC?

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 B3287 GMC?

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 B3287 GMC 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 B3287 GMC Code

1. What does the OBDII code B3287 mean on a GMC vehicle?

The B3287 code indicates a problem with the Left Rear Window Express Up or Down Circuit, specifically that the circuit is experiencing a low voltage condition.

2. What are the common symptoms of a B3287 code on a GMC?

Symptoms may include the left rear window not operating in express up or down mode, slow window movement, or the window being completely unresponsive.

3. What can cause the B3287 code to appear?

Common causes include a faulty window switch, damaged wiring or connectors in the window circuit, a malfunctioning window motor, or a short to ground in the circuit.

4. Can a dead battery cause the B3287 code to trigger?

While unlikely, a weak or dead battery can sometimes contribute to low voltage issues in circuits, which could potentially trigger this code.

5. How is the B3287 code diagnosed?

Technicians typically use a scan tool to confirm the code, inspect the wiring and connectors for damage or corrosion, and test the window switch and motor for proper operation.

6. Can I still use the left rear window if the B3287 code is present?

In many cases, the window may still operate manually but may not work in express up/down mode. However, if the circuit is severely damaged, the window may not function at all.

7. How do I fix the B3287 code on my GMC?

Repairs may involve replacing a faulty window switch, repairing damaged wiring, reconnecting loose connectors, or replacing the window motor if necessary.

8. Is the B3287 code covered under warranty?

This depends on your vehicleâ€™s warranty coverage. Electrical issues may be covered under the basic or extended warranty, but itâ€™s best to check with your dealership.

9. Can the B3287 code drain my car battery?

If the issue involves a short circuit, it could potentially draw power continuously and drain the battery over time.

10. Do I need special tools to fix a B3287 code on a GMC?

Basic tools like a multimeter for testing voltage and continuity may be needed. In some cases, a professional scan tool may be required to diagnose and clear the code.