AutoCodes – Chevrolet – B0338 Chevrolet

B0338 Chevrolet Code - Inside 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 Inside Temperature Sensor, Inside Temperature Sensor harness is open or shorted, Inside 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: B0338 Chevrolet indicates Inside Air Temperature Sensor Open.
Common causes: Common causes include Faulty Inside Temperature Sensor, Inside Temperature Sensor harness is open or shorted, Inside 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 1,711

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 B0338 Chevrolet 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 B0338 Chevrolet - Inside Air Temperature Sensor Open - AutoCodes.com — B0338 Chevrolet Code - Inside Air Temperature Sensor Open

What does this mean?

What are the Possible Causes of the DTC B0338 Chevrolet?

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

How to Fix the DTC B0338 Chevrolet?

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 B0338 Chevrolet 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 B0338 Chevrolet code?

Need more information on how to fix the B0338 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0338 Chevrolet 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 B0338 Chevrolet Code

1. What are the common symptoms of OBDII code B0338 in a Chevrolet related to the Inside Air Temperature Sensor Open?

The common symptoms include inaccurate readings on the climate control system, inconsistent air conditioning performance, and the inability to adjust the interior temperature effectively.

2. What usually causes the Inside Air Temperature Sensor Open code B0338 in Chevrolet vehicles?

The code B0338 is typically triggered by a faulty inside air temperature sensor, a damaged wiring harness, or a poor electrical connection.

3. How can I diagnose the Inside Air Temperature Sensor Open issue in my Chevrolet?

You can diagnose the issue by visually inspecting the sensor and its wiring for any visible damage. Using a multimeter, you can also test the sensor's resistance to determine if it is within the specified range.

4. What are some DIY repair tips for resolving the B0338 code in a Chevrolet?

DIY repair tips include checking and repairing any damaged wiring, replacing the inside air temperature sensor if it is faulty, and ensuring all electrical connections are secure.

5. Can I continue driving my Chevrolet with the B0338 OBDII code present?

While it may be possible to continue driving your Chevrolet with the B0338 code, it is recommended to address the issue promptly to prevent further complications with the climate control system.

6. Is it essential to reset the OBDII code B0338 after repairing the issue in a Chevrolet?

Yes, it is important to reset the code using an OBDII scanner after resolving the underlying problem. This will clear the error code and ensure the issue has been successfully addressed.

7. How much does it typically cost to repair the Inside Air Temperature Sensor Open code B0338 in a Chevrolet?

The cost of repairing the B0338 code can vary depending on the extent of the issue and whether you choose to DIY or seek professional help. It may involve minimal costs for sensor replacement or wiring repairs.

8. Will the Inside Air Temperature Sensor Open code B0338 affect my Chevrolet's overall performance?

While the B0338 code is related to the climate control system, it may not significantly impact the overall performance of your Chevrolet. However, addressing the issue promptly is recommended to maintain optimal comfort levels inside the vehicle.

9. Can extreme temperatures or weather conditions trigger the B0338 OBDII code in a Chevrolet?

Extreme temperatures or weather conditions are unlikely to directly trigger the B0338 code. However, prolonged exposure to extreme conditions could potentially cause sensor or wiring damage over time.

10. Are there any preventive measures I can take to avoid encountering the B0338 OBDII code in my Chevrolet?

Regularly inspecting the climate control system, ensuring proper maintenance of the inside air temperature sensor, and addressing any electrical issues promptly can help prevent the occurrence of the B0338 code in your Chevrolet.