AutoCodes – GMC – B0179 GMC

B0179 GMC Code - Output Air Temperature Sensor 2 Circuit Range/Performance

Quick Answer

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the discharge duct air, outside air and inside air temperatures. Common causes include Faulty Output Air Temperature Sensor 2, Output Air Temperature Sensor 2 harness is open or shorted, Output Air Temperature Sensor 2 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: B0179 GMC indicates Output Air Temperature Sensor 2 Circuit Range/Performance.
Common causes: Common causes include Faulty Output Air Temperature Sensor 2, Output Air Temperature Sensor 2 harness is open or shorted, Output Air Temperature Sensor 2 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 1,481

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 B0179 GMC Description

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the discharge duct air, outside air and inside air temperatures. The HVAC control module provides ground to the air temperature sensor through the low reference circuit. The HVAC control module monitors the voltage drop across the air temperature sensor thermistor by supplying a 5 volt reference to the signal circuit of the air temperature sensor for automatic control calculations. When the air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the air temperatures are hot, the resistances of the sensors are low and the voltage signals are low. The HVAC control module can read voltage values and count values where 1 volt is approximately equal to 51 counts.

OBDII Code B0179 GMC - Output Air Temperature Sensor 2 Circuit Range/Performance - AutoCodes.com — B0179 GMC Code - Output Air Temperature Sensor 2 Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC B0179 GMC?

Faulty Output Air Temperature Sensor 2
Output Air Temperature Sensor 2 harness is open or shorted
Output Air Temperature Sensor 2 circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0179 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 B0179 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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Need Help with the Code?

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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 B0179 GMC Code

1. What are common symptoms of OBDII code B0179 GMC?

- Common symptoms include issues with the HVAC system, inaccurate temperature readings, and potential activation of the check engine light.

2. What does the Output Air Temperature Sensor 2 Circuit do in a GMC vehicle?

- The Output Air Temperature Sensor 2 Circuit is responsible for monitoring and regulating the temperature of the air output in the HVAC system.

3. What are some possible causes of the B0179 GMC trouble code?

- Possible causes include a faulty output air temperature sensor, wiring issues, a poor connection, or a problem with the HVAC control module.

4. How can I diagnose the B0179 code in my GMC vehicle?

- Diagnosis typically involves using a scan tool to retrieve the specific trouble code, checking the sensor's wiring and connections, and testing the sensor's resistance.

5. Can I continue driving my vehicle with the B0179 trouble code present?

- It is not recommended to continue driving with the B0179 code present, as it can lead to potential HVAC system malfunctions and inaccurate temperature control.

6. How should I repair the Output Air Temperature Sensor 2 Circuit Range/Performance issue?

- The repair process usually involves replacing the faulty output air temperature sensor, repairing any damaged wiring, and ensuring proper connections.

7. Is it possible to reset the B0179 trouble code without fixing the underlying issue?

- While you can clear the trouble code with a scan tool, it is essential to address the root cause to prevent the code from reappearing and ensure proper functionality of the HVAC system.

8. Can extreme temperatures or environmental conditions trigger the B0179 GMC trouble code?

- Extreme temperatures or environmental conditions can potentially affect sensor performance, leading to the triggering of the B0179 code in some cases.

9. Should I attempt to repair the B0179 code myself, or is professional assistance recommended?

- While some DIY enthusiasts may be able to address the issue themselves, it is often recommended to seek professional assistance to accurately diagnose and repair the Output Air Temperature Sensor 2 Circuit problem.

10. How can I prevent the B0179 trouble code from recurring in the future?

- Regular maintenance checks, ensuring proper sensor function, and addressing any HVAC system issues promptly can help prevent the B0179 trouble code from recurring in the future.