AutoCodes – GMC – B0283 2018 GMC Sierra

B0283 2018 GMC Sierra 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 2018 GMC Sierra 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 187

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B0283 2018 GMC Sierra 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 2018 GMC Sierra - Electric Rear Defrost Circuit Malfunction - AutoCodes.com — B0283 2018 GMC Sierra Code - Electric Rear Defrost Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B0283 2018 GMC Sierra?

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 2018 GMC Sierra?

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 2018 GMC Sierra 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 2018 GMC Sierra code?

Need more information on how to fix the B0283 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0283 2018 GMC Sierra 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 B0283 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B0283 in a 2018 GMC Sierra?

- Common symptoms include the rear defroster not working, defroster grid lines not heating up, and a warning light on the dashboard.

2. What can cause the Electric Rear Defrost Circuit Malfunction in a 2018 GMC Sierra?

- The malfunction can be caused by damaged defroster grid lines, a faulty defroster relay, a blown fuse, or a problem with the rear defroster switch.

3. How can I diagnose the Electric Rear Defrost Circuit Malfunction in my 2018 GMC Sierra?

- You can diagnose the issue by visually inspecting the defroster grid lines for damage, checking the fuse and relay, and using an OBDII scanner to retrieve the specific fault code.

4. Can I repair the Electric Rear Defrost Circuit Malfunction in my 2018 GMC Sierra myself?

- Depending on the cause, you may be able to repair the issue yourself by replacing damaged grid lines, a faulty relay, or a blown fuse. However, complex wiring issues may require professional help.

5. Is it safe to continue driving my 2018 GMC Sierra with the B0283 OBDII code?

- It is generally safe to drive with this code, but it is recommended to address the issue promptly to ensure visibility through the rear window during inclement weather.

6. How much does it cost to repair the Electric Rear Defrost Circuit Malfunction in a 2018 GMC Sierra?

- The cost of repair can vary depending on the cause of the issue and whether you do the repair yourself or take it to a professional. Costs may range from a few dollars for a fuse replacement to a couple of hundred dollars for more extensive repairs.

7. Can weather conditions affect the Electric Rear Defrost Circuit Malfunction in my 2018 GMC Sierra?

- Extreme weather conditions, such as freezing temperatures or heavy snow, can exacerbate the issue by putting additional stress on the rear defroster system. It is important to address the problem promptly in such conditions.

8. What is the purpose of the Electric Rear Defrost Circuit in a 2018 GMC Sierra?

- The Electric Rear Defrost Circuit is designed to clear condensation, frost, or ice from the rear window of the vehicle to improve visibility for the driver.

9. Are there any preventative maintenance steps I can take to avoid the B0283 OBDII code in my 2018 GMC Sierra?

- Regularly inspecting the rear defroster grid lines for damage, ensuring proper operation of the defroster switch, and keeping the rear window clean can help prevent issues that may trigger the code.

10. Can the B0283 OBDII code in a 2018 GMC Sierra affect other electrical systems in the vehicle?

- While the code specifically relates to the Electric Rear Defrost Circuit, underlying electrical issues that trigger the code may potentially affect other systems in the vehicle. It is advisable to address the problem promptly to prevent further complications.