AutoCodes – GMC – B0286 GMC

B0286 GMC Code - Electric Rear Defrost Circuit High

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: B0286 GMC indicates Electric Rear Defrost Circuit High.
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 900

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 B0286 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 B0286 GMC - Electric Rear Defrost Circuit High - AutoCodes.com — B0286 GMC Code - Electric Rear Defrost Circuit High

What does this mean?

What are the Possible Causes of the DTC B0286 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 B0286 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 B0286 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 B0286 GMC Code

1. What are common symptoms associated with OBDII code B0286 GMC?

- Common symptoms include the rear defrost not working properly, the rear window not clearing frost or condensation, and a warning light on the dashboard.

2. What does OBDII code B0286 GMC indicate?

- This code indicates that there is a high voltage condition detected in the electric rear defrost circuit.

3. What are possible causes of OBDII code B0286 GMC?

- Possible causes include a faulty rear defrost relay, a damaged rear defrost grid, a wiring issue in the defrost circuit, or a problem with the body control module.

4. How can I diagnose the issue causing OBDII code B0286 GMC?

- You can use a multimeter to test the rear defrost relay, visually inspect the rear defrost grid for damage, and check the wiring connections for any signs of corrosion or damage.

5. How can I repair OBDII code B0286 GMC?

- Repair options may include replacing the rear defrost relay, repairing or replacing the damaged rear defrost grid, fixing any wiring issues, or reprogramming the body control module.

6. Can I still drive my vehicle with OBDII code B0286 GMC?

- It is generally safe to drive your vehicle with this code, but you may experience reduced visibility due to the rear defrost not functioning correctly.

7. How urgent is it to address OBDII code B0286 GMC?

- While it may not be urgent, it is recommended to address this code promptly to ensure proper visibility through the rear window, especially in adverse weather conditions.

8. Are there any preventive measures to avoid OBDII code B0286 GMC in the future?

- Regularly inspecting and maintaining the rear defrost system, checking the wiring connections, and addressing any issues promptly can help prevent this code from occurring.

9. Can weather conditions affect the occurrence of OBDII code B0286 GMC?

- Extreme weather conditions, such as freezing temperatures or heavy snow, can put additional strain on the rear defrost system and potentially contribute to the occurrence of this code.

10. How much does it typically cost to repair OBDII code B0286 GMC?

- The cost of repairing this code can vary depending on the specific issue causing it, but it may range from a simple fix like replacing a relay to a more involved repair like fixing the rear defrost grid or wiring.