AutoCodes – GMC – B0333 GMC

B0333 GMC Code - Ambient Air Temperature Sensor Open

Quick Answer

The ambient air temperature sensor allows the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the air surrounding the front of the vehicle. Common causes include Faulty Ambient Air Temperature Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor 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: B0333 GMC indicates Ambient Air Temperature Sensor Open.
Common causes: Common causes include Faulty Ambient Air Temperature Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor 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 889

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 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0333 GMC Description

The ambient air temperature sensor allows the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the air surrounding the front of the vehicle. The inside air temperature sensor allows the HVAC control module to monitor the temperature of the air inside the passenger compartment. 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 circuits. The HVAC control module monitors the voltage drops across the air temperature sensors and uses the inputs for automatic control calculations. The HVAC control module also uses the ambient air temperature input to calculate the value of the ambient air temperature display. When the air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the air temperatures are hot, the resistances of the sensors are low and the voltage signals are low.

OBDII Code B0333 GMC - Ambient Air Temperature Sensor Open - AutoCodes.com — B0333 GMC Code - Ambient Air Temperature Sensor Open

What does this mean?

What are the Possible Causes of the DTC B0333 GMC?

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

How to Fix the DTC B0333 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0333 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.

Need more information about the B0333 GMC code?

Need more information on how to fix the B0333 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0333 GMC code diagnosed by a professional: Find a repair shop in your area

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.