AutoCodes – Chevrolet – B0285 Chevrolet

B0285 Chevrolet Code - Electric Rear Defrost Circuit Low

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: B0285 Chevrolet indicates Electric Rear Defrost Circuit Low.
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 1,035

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 B0285 Chevrolet 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 B0285 Chevrolet - Electric Rear Defrost Circuit Low - AutoCodes.com — B0285 Chevrolet Code - Electric Rear Defrost Circuit Low

What does this mean?

What are the Possible Causes of the DTC B0285 Chevrolet?

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

How to Fix the DTC B0285 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 B0285 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.

Need more information about the B0285 Chevrolet code?

Need more information on how to fix the B0285 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0285 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 B0285 Chevrolet Code

1. What are common symptoms of OBDII code B0285 in a Chevrolet related to the electric rear defrost circuit?

The common symptoms include a malfunctioning rear defroster, failure of the rear window defroster to clear fog or frost, and possibly a lit warning light on the dashboard.

2. What are the possible causes of OBDII code B0285 in a Chevrolet, indicating an electric rear defrost circuit low condition?

Possible causes include a faulty rear defrost switch, damaged defrost grid on the rear window, a broken or shorted defrost grid wiring, or a malfunctioning rear defrost relay.

3. How can I diagnose OBDII code B0285 in a Chevrolet related to the electric rear defrost circuit?

To diagnose this issue, you can visually inspect the rear defrost grid for damage, check the rear defrost switch for proper operation, test the rear defrost relay, and inspect the wiring for any signs of damage or shorts.

4. What are the repair tips for resolving OBDII code B0285 in a Chevrolet due to an electric rear defrost circuit low problem?

Repair tips may include repairing or replacing damaged defrost grid elements, fixing any wiring issues, replacing a faulty rear defrost switch or relay, and ensuring proper grounding of the defrost system.

5. Can OBDII code B0285 in a Chevrolet be reset without fixing the electric rear defrost circuit issue?

Resetting the code without addressing the underlying issue with the electric rear defrost circuit is not recommended, as the problem may persist and potentially affect the functionality of the rear defroster.

6. Is it safe to continue driving a Chevrolet with OBDII code B0285 indicating an electric rear defrost circuit low problem?

While it may be safe to drive the vehicle in most cases, it is advisable to address the issue promptly to ensure the rear defrost system functions correctly, especially in cold or foggy weather conditions.

7. Can extreme weather conditions contribute to triggering OBDII code B0285 in a Chevrolet related to the electric rear defrost circuit?

Extreme weather conditions, such as frost, ice, or heavy rain, can potentially exacerbate existing issues with the rear defrost circuit, leading to the triggering of OBDII code B0285.

8. How can I prevent OBDII code B0285 in a Chevrolet due to the electric rear defrost circuit low problem from recurring?

Regularly inspecting and maintaining the rear defrost system, keeping the rear window clean, and addressing any electrical issues promptly can help prevent the recurrence of this OBDII code.

9. Are there any DIY fixes for resolving OBDII code B0285 in a Chevrolet associated with an electric rear defrost circuit low issue?

Depending on the cause, some DIY fixes may include repairing minor wiring damage, cleaning the rear defrost grid, or replacing a faulty rear defrost switch if you have the necessary skills and tools.

10. How important is it to address OBDII code B0285 in a Chevrolet related to the electric rear defrost circuit low condition?

It is essential to address this code promptly to ensure the proper functioning of the rear defrost system, especially for visibility and safety reasons during adverse weather conditions.