AutoCodes – GMC – B0284 GMC

B0284 GMC Code - Electric Rear Defrost Circuit Range/Performance

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: B0284 GMC indicates Electric Rear Defrost Circuit Range/Performance.
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 944

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 B0284 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 B0284 GMC - Electric Rear Defrost Circuit Range/Performance - AutoCodes.com — B0284 GMC Code - Electric Rear Defrost Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC B0284 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 B0284 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 B0284 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 B0284 GMC Code

1. What are common symptoms of OBDII code B0284 in a GMC vehicle?

The common symptoms of OBDII code B0284 in a GMC vehicle include a rear defroster that doesn't function properly, lack of heating on the rear windshield, and a warning light on the dashboard.

2. What does the OBDII code B0284 GMC indicate?

OBDII code B0284 for GMC vehicles indicates an issue with the Electric Rear Defrost Circuit Range/Performance.

3. What are possible causes of OBDII code B0284 in a GMC vehicle?

Possible causes of OBDII code B0284 in a GMC vehicle include a faulty rear defrost switch, damaged wiring or connectors in the rear defrost circuit, a malfunctioning rear defrost relay, or a problem with the rear defrost grid on the windshield.

4. How can I diagnose OBDII code B0284 in my GMC vehicle?

Diagnosing OBDII code B0284 in a GMC vehicle involves checking the rear defrost switch, inspecting the wiring and connectors in the rear defrost circuit, testing the rear defrost relay, and examining the rear defrost grid on the windshield for damage.

5. What are some repair tips for fixing OBDII code B0284 in a GMC vehicle?

Repair tips for fixing OBDII code B0284 in a GMC vehicle include repairing or replacing the rear defrost switch, repairing any damaged wiring or connectors, replacing the rear defrost relay if necessary, and repairing or replacing the rear defrost grid on the windshield.

6. Can OBDII code B0284 in a GMC vehicle be cleared/reset without fixing the issue?

Clearing or resetting OBDII code B0284 in a GMC vehicle without fixing the underlying issue will likely result in the code reappearing once the vehicle is driven and the system detects the problem again.

7. Is it safe to continue driving with OBDII code B0284 in a GMC vehicle?

While it may be safe to drive with OBDII code B0284 in a GMC vehicle, it is recommended to address the issue promptly to ensure proper functioning of the rear defroster, especially in cold or rainy conditions where visibility through the rear windshield is crucial.

8. How much does it typically cost to repair OBDII code B0284 in a GMC vehicle?

The cost to repair OBDII code B0284 in a GMC vehicle can vary depending on the specific cause of the issue, parts needed for repair, labor rates, and whether the repair is done at a dealership or an independent mechanic. It is advisable to get a diagnosis and repair estimate from a qualified technician.

9. Can OBDII code B0284 affect other systems or components in a GMC vehicle?

OBDII code B0284 is specific to the Electric Rear Defrost Circuit and is unlikely to directly affect other systems or components in a GMC vehicle. However, addressing the issue promptly is important to maintain overall vehicle functionality and safety.

10. Are there any preventative measures to avoid OBDII code B0284 in a GMC vehicle?

To prevent OBDII code B0284 in a GMC vehicle, regular inspection of the rear defrost system, ensuring proper operation of the rear defroster, and addressing any issues promptly can help maintain the system's functionality and prevent potential faults that trigger the code.