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B0158 2018 GMC Sierra Code - Ambient Air Temperature Sensor Circuit

Quick Answer

The B0158 diagnostic trouble code (DTC) specifically relates to the ambient air temperature sensor circuit in a 2018 GMC Sierra. Common causes include Faulty ambient air temperature sensor, Wiring issues or loose connections in the sensor circuit, Corrosion or damage to the sensor connector. 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
B0158 2018 GMC Sierra indicates Ambient Air Temperature Sensor Circuit.
Common causes
Common causes include Faulty ambient air temperature sensor, Wiring issues or loose connections in the sensor circuit, Corrosion or damage to the sensor connector.
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 10, 2024
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Code B0158 2018 GMC Sierra Description

The B0158 diagnostic trouble code (DTC) specifically relates to the ambient air temperature sensor circuit in a 2018 GMC Sierra. The ambient air temperature sensor is a crucial component of the vehicle's climate control system and is responsible for monitoring the outside air temperature. This information is used by the HVAC (Heating, Ventilation, and Air Conditioning) system to regulate the interior temperature and provide optimal comfort for the occupants.

OBDII Code B0158 2018 GMC Sierra - Ambient Air Temperature Sensor Circuit
B0158 2018 GMC Sierra Code - Ambient Air Temperature Sensor Circuit

Common Causes of B0158 2018 GMC Sierra

  1. Faulty ambient air temperature sensor.
  2. Wiring issues or loose connections in the sensor circuit.
  3. Corrosion or damage to the sensor connector.
  4. Environmental factors such as exposure to extreme temperatures or moisture.
  5. Electronic control unit (ECU) malfunction affecting the sensor circuit.

Symptoms of B0158 2018 GMC Sierra

  1. Inaccurate temperature readings displayed on the vehicle's climate control system.
  2. Erratic behavior of the HVAC system, such as inconsistent heating or cooling.
  3. Difficulty defrosting the windshield in cold weather.
  4. Poor fuel efficiency due to incorrect air-fuel mixture ratios.
  5. Malfunction indicator light (MIL) illuminated on the dashboard.

How to Fix B0158 2018 GMC Sierra

  1. Diagnose the issue by using a scan tool to retrieve the DTC and inspect the ambient air temperature sensor and its circuit.
  2. Check the sensor's wiring and connector for any signs of damage, corrosion, or loose connections.
  3. Test the ambient air temperature sensor's resistance to determine if it is within the manufacturer's specified range.
  4. Replace the ambient air temperature sensor if it is found to be faulty or out of specification.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix B0158 2018 GMC Sierra

The cost of repairing a faulty ambient air temperature sensor circuit in a 2018 GMC Sierra can vary depending on the specific parts needed and the labor rates of the auto repair shop. In general, replacing the ambient air temperature sensor itself can cost anywhere from $50 to $150, while labor costs can range from $80 to $150 per hour. Overall, the total repair cost for this issue may fall between $150 and $300. It is advisable to contact local auto repair shops for accurate estimates based on your location and vehicle specifications.

What does this mean?

Tech Notes for B0158 2018 GMC Sierra

B0158:02 Ambient Air Temperature Sensor Circuit Short to Ground

B0158:05 Ambient Air Temperature Sensor Circuit High Voltage/Open











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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 B0158 2018 GMC Sierra Code

1. What are common symptoms of OBDII code B0158 in a 2018 GMC Sierra?

The common symptoms of OBDII code B0158 in a 2018 GMC Sierra include inaccurate temperature readings on the dashboard, issues with the climate control system, and potential activation of the check engine light.

2. What does the OBDII code B0158 indicate in a 2018 GMC Sierra?

The OBDII code B0158 in a 2018 GMC Sierra specifically refers to a fault in the Ambient Air Temperature Sensor Circuit.

3. What are possible causes of OBDII code B0158 in a 2018 GMC Sierra?

Possible causes of OBDII code B0158 in a 2018 GMC Sierra include a faulty ambient air temperature sensor, damaged wiring or connectors in the circuit, or a malfunction in the climate control module.

4. How can I diagnose the issue related to OBDII code B0158 in my 2018 GMC Sierra?

To diagnose the issue related to OBDII code B0158 in your 2018 GMC Sierra, you can use an OBDII scanner to read and interpret the code, visually inspect the sensor and its wiring for any visible damage, and perform continuity tests on the sensor and circuit.

5. Can I repair OBDII code B0158 in a 2018 GMC Sierra myself?

Repairing OBDII code B0158 in a 2018 GMC Sierra may be possible for those with automotive repair experience. You can start by replacing the ambient air temperature sensor and checking for any damaged wiring or connectors. If unsure, it's recommended to consult a professional mechanic.

6. Will driving with OBDII code B0158 in a 2018 GMC Sierra cause any further damage?

Continuing to drive with OBDII code B0158 in a 2018 GMC Sierra may not cause immediate harm to the vehicle, but it can lead to inaccurate temperature readings and potential issues with the climate control system. It's best to address the problem promptly.

7. How much does it typically cost to fix OBDII code B0158 in a 2018 GMC Sierra?

The cost to fix OBDII code B0158 in a 2018 GMC Sierra can vary depending on the root cause of the issue, the labor rates of the repair shop, and the cost of any necessary replacement parts. It's advisable to obtain quotes from different sources for an accurate estimate.

8. Can a faulty ambient air temperature sensor impact other systems in a 2018 GMC Sierra?

Yes, a faulty ambient air temperature sensor in a 2018 GMC Sierra can potentially impact other systems, such as the climate control system, automatic temperature control, and even the engine management system in some cases.

9. How urgent is it to address OBDII code B0158 in a 2018 GMC Sierra?

While OBDII code B0158 in a 2018 GMC Sierra may not pose an immediate safety risk, it's important to address the issue in a timely manner to ensure accurate temperature readings and proper functioning of the climate control system.

10. Are there any preventive measures to avoid encountering OBDII code B0158 in a 2018 GMC Sierra?

To potentially prevent encountering OBDII code B0158 in a 2018 GMC Sierra, regular maintenance checks, including inspecting the ambient air temperature sensor and its wiring, can help identify any early signs of issues before they escalate.

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