AutoCodes – GMC – B0287 GMC

B0287 GMC 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 GMC 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 877

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

What does this mean?

What are the Possible Causes of the DTC B0287 GMC?

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 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 B0287 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 B0287 GMC Code

1. What are the common symptoms of OBDII code B0287 GMC (Electric Rear Defrost Circuit Open)?

- The common symptoms include the rear defroster not functioning, rear window not clearing of fog or frost, and a warning light on the dashboard.

2. What are the possible causes of OBDII code B0287 GMC?

- The possible causes include a damaged rear defrost grid, a faulty defrost relay, wiring issues, or a malfunctioning control module.

3. How can I diagnose the Electric Rear Defrost Circuit Open issue?

- You can start by visually inspecting the rear defrost grid for any visible damage or breaks. Use a multimeter to test for continuity in the grid and check the relay and wiring connections for any issues.

4. Can I still drive my vehicle with the B0287 GMC code?

- It is generally safe to drive the vehicle with this code, but it is important to address the issue promptly to ensure proper visibility through the rear window in adverse weather conditions.

5. How can I repair the Electric Rear Defrost Circuit Open problem?

- Repair options may include repairing the damaged grid, replacing the defrost relay, fixing wiring issues, or replacing the control module, depending on the root cause of the problem.

6. Is it possible to reset the B0287 GMC code without fixing the issue?

- While clearing the code may temporarily turn off the warning light, it is crucial to fix the underlying problem causing the Electric Rear Defrost Circuit Open issue for a permanent solution.

7. Can extreme weather conditions cause the B0287 GMC code to trigger?

- Yes, extreme temperatures or physical damage to the rear window can potentially lead to the Electric Rear Defrost Circuit Open fault code.

8. Are there any preventive measures to avoid the recurrence of OBDII code B0287 GMC?

- Regularly inspecting and maintaining the rear defrost system, avoiding excessive force when cleaning the rear window, and addressing any issues promptly can help prevent the code from reoccurring.

9. Will fixing the B0287 GMC code improve the overall performance of my vehicle?

- While resolving the Electric Rear Defrost Circuit Open issue may not directly impact performance, it is essential for safety and maintaining proper visibility while driving.

10. How long does it typically take to repair the Electric Rear Defrost Circuit Open problem?

- The repair time can vary depending on the specific cause of the issue. Simple fixes like repairing a broken grid may take less time, while more complex issues like control module replacement may require more time and expertise.