AutoCodes – GMC – B0173 GMC

B0173 GMC Code - Output Air Temperature Sensor 1 Circuit

Quick Answer

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the discharge air in the HVAC ducts. Common causes include Faulty Output Air Temperature Sensor 1, Output Air Temperature Sensor 1 harness is open or shorted, Output Air Temperature Sensor 1 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: B0173 GMC indicates Output Air Temperature Sensor 1 Circuit.
Common causes: Common causes include Faulty Output Air Temperature Sensor 1, Output Air Temperature Sensor 1 harness is open or shorted, Output Air Temperature Sensor 1 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 1,295

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0173 GMC Description

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the discharge air in the HVAC ducts. The module applies 5 volts to internal input resistors that are connected to the signal circuits of the air temperature sensors. The module provides ground to the air temperature sensors through the low reference circuit. The HVAC control module monitors the voltage drops across the air temperature sensors and uses the inputs for automatic control calculations. When the duct air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the duct air temperatures are hot, the resistances of the sensors are low and the voltage signals are low. The HVAC control module converts the voltage values to count values where 1 volt is approximately equal to 51 counts.

OBDII Code B0173 GMC - Output Air Temperature Sensor 1 Circuit - AutoCodes.com — B0173 GMC Code - Output Air Temperature Sensor 1 Circuit

What does this mean?

What are the Possible Causes of the DTC B0173 GMC?

Faulty Output Air Temperature Sensor 1
Output Air Temperature Sensor 1 harness is open or shorted
Output Air Temperature Sensor 1 circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0173 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 does this mean?

Code Tech Notes

B0173 05: Output Air Temperature Sensor 1 Circuit Short to Battery or Open
B0173 02: Output Air Temperature Sensor 1 Circuit Short to Ground

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0173 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 B0173 GMC Code

1. What are common symptoms of OBDII code B0173 GMC related to the Output Air Temperature Sensor 1 Circuit?

- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code B0173 GMC?

- Possible causes include a faulty output air temperature sensor, wiring issues, a damaged connector, or a problem within the engine control module.

3. How can I diagnose the cause of OBDII code B0173 GMC?

- Diagnosing this code typically involves using a scan tool to retrieve and interpret the code, checking the sensor and related wiring for damage, and testing the sensor's resistance.

4. Can I continue driving my vehicle with OBDII code B0173 GMC active?

- While the vehicle may still be operable with this code, it is not recommended to ignore it, as it can lead to further damage and poor engine performance if left unresolved.

5. How can I repair OBDII code B0173 GMC related to the Output Air Temperature Sensor 1 Circuit?

- Repairing this code usually involves replacing the faulty output air temperature sensor, repairing any damaged wiring or connectors, and clearing the code with a scan tool.

6. Are there any DIY tips for fixing OBDII code B0173 GMC?

- DIY enthusiasts can attempt to replace the output air temperature sensor themselves by following a repair manual specific to their vehicle make and model.

7. Is it necessary to reset the Check Engine Light after fixing OBDII code B0173 GMC?

- Yes, it is recommended to use a scan tool to clear the code and reset the Check Engine Light after repairing the issue to ensure proper functionality.

8. How long does it typically take to repair OBDII code B0173 GMC?

- The repair time can vary depending on the exact cause of the code and the level of expertise of the person performing the repair, but it can usually be completed within a few hours.

9. Can extreme weather conditions affect the output air temperature sensor and trigger OBDII code B0173 GMC?

- Yes, extreme temperatures can potentially impact the sensor's performance and lead to the triggering of this code, especially if the sensor is exposed to harsh conditions.

10. Will fixing OBDII code B0173 GMC improve my vehicle's performance and fuel efficiency?

- Yes, resolving this code and ensuring proper functioning of the output air temperature sensor can help restore optimal engine performance and fuel efficiency.