AutoCodes – Cadillac – B0338 Cadillac

B0338 Cadillac 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 Cadillac 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 1,065

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

What does this mean?

What are the Possible Causes of the DTC B0338 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

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

Need Help with the Code?

Get the B0338 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code B0338 (Cadillac) for the Inside Air Temperature Sensor Open?

The common symptoms include inaccurate readings on the climate control system, inconsistent air conditioning performance, and potential issues with the defrost system.

2. What causes the Inside Air Temperature Sensor Open code B0338 in a Cadillac?

The code B0338 typically occurs due to a malfunction in the inside air temperature sensor, a wiring issue, or a faulty sensor connection.

3. How can I diagnose the Inside Air Temperature Sensor Open code B0338 in my Cadillac?

Diagnosing the B0338 code involves checking the inside air temperature sensor for proper connection, inspecting the wiring for any damage, and using a multimeter to test the sensor's resistance.

4. Is it safe to continue driving my Cadillac with the B0338 code (Inside Air Temperature Sensor Open)?

While it may be safe to drive with the B0338 code, it is recommended to address the issue promptly to avoid potential discomfort from inaccurate climate control and to prevent further damage to the system.

5. Can I repair the Inside Air Temperature Sensor Open code B0338 in my Cadillac myself?

If you have experience with automotive repairs and the necessary tools, you may be able to repair the B0338 code yourself by replacing the inside air temperature sensor or repairing any damaged wiring.

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

The cost of repairing the B0338 code can vary depending on the extent of the issue, but it generally ranges from $100 to $300 for parts and labor.

7. Will resetting the OBDII system clear the B0338 code in my Cadillac?

Resetting the OBDII system may temporarily clear the B0338 code, but if the underlying issue with the inside air temperature sensor or wiring is not addressed, the code is likely to reappear.

8. Can extreme temperatures affect the Inside Air Temperature Sensor Open code B0338 in a Cadillac?

Extreme temperatures can potentially impact the inside air temperature sensor's performance and trigger the B0338 code, especially if there are existing issues with the sensor or its wiring.

9. Are there any preventive measures to avoid the Inside Air Temperature Sensor Open code B0338 in a Cadillac?

Regularly inspecting the inside air temperature sensor, ensuring proper wiring connections, and addressing any climate control system issues promptly can help prevent the occurrence of the B0338 code.

10. How long does it typically take to repair the Inside Air Temperature Sensor Open code B0338 in a Cadillac?

The repair time for the B0338 code can vary based on the complexity of the issue and the technician's expertise, but most repairs can be completed within a few hours to a day.