AutoCodes – GMC – B0283 GMC

B0283 GMC Code - Electric Rear Defrost Circuit Malfunction

Quick Answer

When the rear heated rear window switch is pressed and the engine is running, the rear window defogger grid will activate and will turn off automatically depending upon the vehicle's speed. Common causes include Faulty Rear Defogger Relay, Rear Defogger Relay harness is open or shorted, Rear Defogger Relay 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: B0283 GMC indicates Electric Rear Defrost Circuit Malfunction.
Common causes: Common causes include Faulty Rear Defogger Relay, Rear Defogger Relay harness is open or shorted, Rear Defogger Relay 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 1,870

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 Nov 12, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0283 GMC Description

When the rear heated rear window switch is pressed and the engine is running, the rear window defogger grid will activate and will turn off automatically depending upon the vehicle's speed. The Heating, Ventilation, and Air Conditioning (HVAC) Control Module monitors the voltage level on the supply voltage circuit of the rear window defogger. The HVAC tests 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 the system voltage.

OBDII Code B0283 GMC - Electric Rear Defrost Circuit Malfunction - AutoCodes.com — B0283 GMC Code - Electric Rear Defrost Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B0283 GMC?

Faulty Rear Defogger Relay
Rear Defogger Relay harness is open or shorted
Rear Defogger Relay circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0283 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 B0283 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.

Need more information about the B0283 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

B0283 2014 GMC Sierra — Electric Rear Defrost Circuit Malfunction
B0283 2015 GMC Sierra — Electric Rear Defrost Circuit Malfunction
B0283 2016 GMC Sierra — Electric Rear Defrost Circuit Malfunction
B0283 2017 GMC Sierra — Electric Rear Defrost Circuit Malfunction
B0283 2018 GMC Sierra — Electric Rear Defrost Circuit Malfunction

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 B0283 GMC Code

1. What are the common symptoms of OBDII code B0283 GMC?

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

2. What could cause the Electric Rear Defrost Circuit Malfunction (B0283) in a GMC vehicle?

- Possible causes include a faulty rear defroster grid, damaged wiring or connectors, a defective rear defroster switch, or a blown fuse.

3. How can I diagnose the Electric Rear Defrost Circuit Malfunction in my GMC?

- You can start by visually inspecting the rear defroster grid for damage, checking the wiring and connectors for any issues, and using a multimeter to test for continuity and voltage.

4. Can I repair OBDII code B0283 GMC on my own?

- Depending on the cause, you may be able to repair it yourself by replacing a damaged grid, repairing wiring, or replacing a faulty switch. However, complex electrical issues may require professional help.

5. Are there any quick tips to troubleshoot OBDII code B0283 GMC?

- Quick tips include checking the rear defroster fuse, ensuring the switch is working properly, inspecting the grid for damage, and checking for loose or corroded connections.

6. Is it safe to continue driving with the Electric Rear Defrost Circuit Malfunction?

- It is generally safe to drive with this code, but you may experience visibility issues in cold or damp weather due to the rear defroster not functioning properly.

7. How much does it typically cost to repair OBDII code B0283 GMC at a dealership or repair shop?

- Repair costs can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can a GMC dealership reset the OBDII code B0283 after repairing the Electric Rear Defrost Circuit?

- Yes, a GMC dealership or a qualified mechanic can reset the code using a diagnostic scanner after repairing the issue to clear the warning light.

9. Will disconnecting the battery reset the OBDII code B0283 GMC?

- Disconnecting the battery may temporarily clear the code, but it is not a recommended method as it may also erase other important settings and data in the vehicle's computer system.

10. How often does the Electric Rear Defrost Circuit Malfunction occur in GMC vehicles?

- This code is not extremely common, but it can occur in GMC vehicles with rear defroster systems, especially in older models or vehicles exposed to harsh weather conditions.