Engine-Codes - Generic - B0173

B0173 Code - Output Air Temperature Sensor 1 Circuit

- Code Popularity: 2,850 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 2/3
Table of contents
ChatAC AutoCodes.com AI Chat

What are the Possible Causes of the DTC B0173?

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 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

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

⚠ Does your Car have Safety Recalls? → Check here

How to Fix the DTC B0173?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Search for B0173 Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the B0173 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the B0173 Code Mean?

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.

B0173 Code - Output Air Temperature Sensor 1 Circuit

Need more Information on the Code?

Need more information on how to fix the B0173 code? Get Access to Factory Service Manuals

Code B0173 Information for Specific Makes

Need Help with the Code?

Get the B0173 code diagnosed by a professional: Find a repair shop in your area