AutoCodes – Buick – B0287 Buick

B0287 Buick Code - Electric Rear Defrost Circuit Open

Quick Answer

The Liftgate Module (LGM) monitors the voltage level on the supply voltage circuit of the rear window defogger. Common causes include Faulty Liftgate Module (LGM), Liftgate Module (LGM) harness is open or shorted, Liftgate Module (LGM) circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0287 Buick indicates Electric Rear Defrost Circuit Open.
Common causes: Common causes include Faulty Liftgate Module (LGM), Liftgate Module (LGM) harness is open or shorted, Liftgate Module (LGM) circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 907

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 10, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0287 Buick Description

The Liftgate Module (LGM) monitors the voltage level on the supply voltage circuit of the rear window defogger. The LGM test the supply voltage circuit of the rear window defogger every 160 milliseconds. With the rear window defogger inactive, the supply voltage circuit of the rear window defogger will have no voltage present. With the rear window defogger active, the supply voltage circuit of the rear window defogger will be near system voltage.

OBDII Code B0287 Buick - Electric Rear Defrost Circuit Open - AutoCodes.com — B0287 Buick Code - Electric Rear Defrost Circuit Open

What does this mean?

What are the Possible Causes of the DTC B0287 Buick?

Faulty Liftgate Module (LGM)
Liftgate Module (LGM) harness is open or shorted
Liftgate Module (LGM) circuit poor electrical connection

How to Fix the DTC B0287 Buick?

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 B0287 Buick 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 B0287 Buick Code

1. What does the OBDII code B0287 mean on a Buick?

The code B0287 indicates an "Electric Rear Defrost Circuit Open," meaning there is a problem in the electrical circuit for the rear defrost system.

2. What are the common symptoms of the B0287 code in a Buick?

Symptoms include the rear defroster not functioning, visibility issues due to fogged or frosted rear windows, and the illumination of a warning light in some cases.

3. What causes the B0287 code to appear?

The code can be triggered by a broken or disconnected wire, a faulty rear defroster grid, a failed defrost relay, or a malfunctioning control module.

4. How do I troubleshoot the B0287 code?

Start by visually inspecting the rear defroster grid for breaks, checking the wiring for damage, and testing the defrost relay and related fuses.

5. Can a blown fuse cause the B0287 code?

Yes, a blown fuse in the defrost circuit can interrupt the power supply and trigger the B0287 code.

6. How do I fix the B0287 code on a Buick?

Repairs may include replacing damaged wiring, repairing the rear defroster grid, replacing a faulty relay, or addressing any control module issues.

7. Is the B0287 code a serious issue?

While not critical for vehicle operation, it can affect rear visibility in cold or wet conditions, which could be a safety concern.

8. Can I drive with the B0287 code active?

Yes, you can drive with the code active, but it's important to repair it promptly to ensure proper rear visibility during adverse weather.

9. How much does it cost to fix the B0287 code?

Repair costs vary depending on the issue, but minor repairs like rewiring or replacing a relay typically cost $50-$200, while more extensive grid repairs may be higher.

10. Can I clear the B0287 code without fixing the issue?

Clearing the code without fixing the underlying problem will only temporarily remove it, as it will reappear if the issue persists.