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B0283 GMC Code - Electric Rear Defrost Circuit Malfunction

- Code Popularity: 1,450 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC B0283 GMC?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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
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How to Fix the DTC B0283 GMC?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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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. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

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

Need More Information on the Code?

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