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Engine-Codes – GMC – B0333 GMC

B0333 GMC Code - Ambient Air Temperature Sensor Open

Quick Answer

The B0333 GMC code indicates that there is an issue with the Ambient Air Temperature Sensor, specifically that it is open. Common causes include Wiring or connector issues leading to an open circuit, Corrosion or damage to the Ambient Air Temperature Sensor, Faulty sensor due to age or wear. 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
B0333 GMC indicates Ambient Air Temperature Sensor Open.
Common causes
Common causes include Wiring or connector issues leading to an open circuit, Corrosion or damage to the Ambient Air Temperature Sensor, Faulty sensor due to age or wear.
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 11, 2024
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Code B0333 GMC Description

The B0333 GMC code indicates that there is an issue with the Ambient Air Temperature Sensor, specifically that it is open. The Ambient Air Temperature Sensor is a crucial component of the vehicle's climate control system, as it is responsible for measuring the outside air temperature. This information is used by the HVAC system to adjust the cabin temperature, control the defroster, and regulate the automatic climate control.

OBDII Code B0333 GMC - Ambient Air Temperature Sensor Open
B0333 GMC Code - Ambient Air Temperature Sensor Open

Common Causes of B0333 GMC

  1. Wiring or connector issues leading to an open circuit.
  2. Corrosion or damage to the Ambient Air Temperature Sensor.
  3. Faulty sensor due to age or wear.
  4. Electrical issues within the climate control system.
  5. Environmental factors such as exposure to extreme temperatures or moisture.

Symptoms of B0333 GMC

  1. Inaccurate temperature readings on the climate control display.
  2. HVAC system blowing hot or cold air intermittently.
  3. Inconsistent performance of the defroster.
  4. Decreased fuel efficiency due to improper engine performance.
  5. Check Engine Light illuminated on the dashboard.

How to Fix B0333 GMC

  1. Begin by locating the Ambient Air Temperature Sensor, typically located behind the front grille or in the front bumper.
  2. Inspect the wiring and connectors for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the sensor using a multimeter to determine if it is functioning properly. Replace the sensor if it is found to be faulty.
  4. Clear the diagnostic trouble codes from the vehicle's computer using a scan tool.
  5. Test the climate control system to ensure that the issue has been resolved.

Cost to Fix B0333 GMC

The typical repair costs for addressing a B0333 GMC code can vary depending on the specific vehicle make and model, as well as the location of the repair. On average, the cost of replacing an Ambient Air Temperature Sensor ranges from $50 to $150 for the part alone. Including labor costs, the total repair bill could amount to $150 to $300. It is important to note that labor rates at auto repair shops can vary widely, so it's advisable to check with local shops for a more accurate estimate.

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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 B0333 GMC Code

1. What are the common symptoms of an Ambient Air Temperature Sensor Open error code (B0333) in a GMC vehicle?

The common symptoms include inaccurate temperature readings on the dashboard, issues with the climate control system, and potential impact on fuel efficiency.

2. What can cause the Ambient Air Temperature Sensor Open code (B0333) to trigger in a GMC vehicle?

The code can be triggered by a faulty ambient air temperature sensor, damaged wiring or connectors, or a loose connection in the sensor circuit.

3. How can I diagnose the Ambient Air Temperature Sensor Open issue (B0333) in my GMC vehicle?

You can diagnose the issue by inspecting the sensor and its wiring for any visible damage, using a multimeter to test the sensor's resistance, and checking for proper voltage supply.

4. Can I drive my GMC vehicle with the Ambient Air Temperature Sensor Open code (B0333) present?

It is generally safe to drive with this error code, but you may experience issues with the climate control system and inaccurate temperature readings.

5. What are some repair tips for fixing the Ambient Air Temperature Sensor Open error code (B0333) in a GMC vehicle?

Repair tips include replacing the faulty sensor, repairing or replacing damaged wiring or connectors, and ensuring a secure connection in the sensor circuit.

6. How much does it typically cost to repair the Ambient Air Temperature Sensor Open code (B0333) in a GMC vehicle?

The cost of repair can vary depending on the extent of the issue, but replacing the sensor or repairing the wiring may cost between $50 to $200, including parts and labor.

7. Can I reset the Ambient Air Temperature Sensor Open code (B0333) in my GMC vehicle without repairing the issue?

You can reset the code using an OBDII scanner, but the error is likely to reappear if the underlying issue is not fixed.

8. Will the Ambient Air Temperature Sensor Open code (B0333) affect my GMC vehicle's performance?

While the code itself may not directly impact performance, it can lead to issues with the climate control system and potentially affect fuel efficiency.

9. Is the Ambient Air Temperature Sensor Open error code (B0333) common in GMC vehicles?

This error code is relatively common in GMC vehicles, especially in older models where the sensor or wiring may deteriorate over time.

10. How long does it usually take to repair the Ambient Air Temperature Sensor Open code (B0333) in a GMC vehicle?

The repair time can vary depending on the extent of the issue and the availability of parts, but it typically takes about 1-2 hours for a professional technician to diagnose and fix the problem.

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