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Engine-Codes – Generic – B0174

B0174 Code - Output Air Temperature Sensor 1 Circuit Range/Performance

Quick Answer

The B0174 code indicates a problem with the Output Air Temperature Sensor 1 circuit's range or performance. Common causes include Faulty Output Air Temperature Sensor 1, Wiring or connector issues in the sensor circuit, Corrosion or damage to the sensor connections. 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
B0174 indicates Output Air Temperature Sensor 1 Circuit Range/Performance.
Common causes
Common causes include Faulty Output Air Temperature Sensor 1, Wiring or connector issues in the sensor circuit, Corrosion or damage to the sensor connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code B0174 Description

The B0174 code indicates a problem with the Output Air Temperature Sensor 1 circuit's range or performance. This sensor is responsible for monitoring the air temperature inside the vehicle's HVAC (Heating, Ventilation, and Air Conditioning) system. When this sensor malfunctions or operates outside of the expected range, it can lead to issues with the vehicle's HVAC system, affecting the interior climate control.

OBDII Code B0174 - Output Air Temperature Sensor 1 Circuit Range/Performance
B0174 Code - Output Air Temperature Sensor 1 Circuit Range/Performance

Common Causes of B0174

  1. Faulty Output Air Temperature Sensor 1.
  2. Wiring or connector issues in the sensor circuit.
  3. Corrosion or damage to the sensor connections.
  4. Malfunctioning HVAC control module.
  5. Electrical problems within the HVAC system.

Symptoms of B0174

  1. Inconsistent temperature output from the HVAC system.
  2. HVAC system blowing hot air when set to cool or vice versa.
  3. Inability to control the temperature settings effectively.
  4. Illumination of the check engine light on the dashboard.

How to Fix B0174

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to read the trouble codes and pinpoint the problem area.
  2. Inspect the Output Air Temperature Sensor 1 and its wiring for any signs of damage or corrosion. Replace the sensor if necessary.
  3. Check the sensor's connections and repair any loose or damaged wiring or connectors.
  4. Clear the trouble codes from the vehicle's computer system and reset the HVAC system to ensure proper operation.
  5. Test the HVAC system to verify that the issue has been resolved and that the sensor is providing accurate readings.

Cost to Fix B0174

The cost of repairing a B0174 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $100 and $300 for parts and labor. Keep in mind that this estimate does not include diagnostic fees, which can range from $50 to $150. It's recommended to consult with a professional mechanic to get a more accurate estimate based on your vehicle's make and model.

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Code B0174 Information for Specific Makes

  • B0174 Buick — Output Air Temperature Sensor 1 Circuit Range/Performance
  • B0174 Cadillac — Output Air Temperature Sensor 1 Circuit Range/Performance
  • B0174 Chevrolet — Output Air Temperature Sensor 1 Circuit Range/Performance
  • B0174 GMC — Output Air Temperature Sensor 1 Circuit Range/Performance
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.

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