AutoCodes – GMC – B3933 2015 GMC Sierra

B3933 2015 GMC Sierra Code - Air Conditioning Evaporator Temperature Sensor Circuit

Quick Answer

The air temperature sensors are a 2-wire negative temperature coefficient thermistor. Common causes include Faulty Air Conditioning Evaporator Temperature Sensor, Air Conditioning Evaporator Temperature Sensor harness is open or shorted, Air Conditioning Evaporator Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B3933 2015 GMC Sierra indicates Air Conditioning Evaporator Temperature Sensor Circuit.
Common causes: Common causes include Faulty Air Conditioning Evaporator Temperature Sensor, Air Conditioning Evaporator Temperature Sensor harness is open or shorted, Air Conditioning Evaporator Temperature Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 212

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 17, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3933 2015 GMC Sierra Description

The air temperature sensors are a 2-wire negative temperature coefficient thermistor. This sensor operates using signal and low reference circuits. As the air temperature surrounding the sensor increases, the sensor resistance decreases. The sensor is capable of reading temperatures ranging from -40 to +80°C (-40 to +176°F), with a signal voltage between 0-5 V. If the Heating, Ventilation, and Air Conditioning (HVAC) Control Module detects a malfunctioning sensor the software uses a default air temperature value. The default action ensures that the HVAC system can adjust the inside air temperature near the desired temperature until the condition is corrected. The Diagnostic Trouble Code (DTC) sets when the input signal is out of range. The HVAC Control Module detects a voltage greater than 4.9 V on the temperature signal circuit.

OBDII Code B3933 2015 GMC Sierra - Air Conditioning Evaporator Temperature Sensor Circuit - AutoCodes.com — B3933 2015 GMC Sierra Code - Air Conditioning Evaporator Temperature Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC B3933 2015 GMC Sierra?

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

How to Fix the DTC B3933 2015 GMC Sierra?

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 B3933 2015 GMC Sierra 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 B3933 2015 GMC Sierra code?

Need more information on how to fix the B3933 2015 GMC Sierra code? Get Access to Factory Service Manuals

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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 B3933 2015 GMC Sierra Code

1. What are common symptoms of OBDII code B3933 in a 2015 GMC Sierra related to the Air Conditioning Evaporator Temperature Sensor Circuit?

- Common symptoms include inconsistent A/C cooling, frequent cycling of the A/C compressor, or complete failure of the A/C system.

2. What can cause OBDII code B3933 in a 2015 GMC Sierra?

- This code is typically triggered by a fault in the wiring, connectors, or the sensor itself related to the air conditioning evaporator temperature sensor circuit.

3. How serious is OBDII code B3933 in a 2015 GMC Sierra?

- While the vehicle may still be operable, prolonged presence of this code can lead to discomfort due to poor A/C performance and potential strain on the A/C system components.

4. How can I diagnose OBDII code B3933 in my 2015 GMC Sierra?

- Diagnosis involves inspecting the wiring, connectors, and sensor related to the air conditioning evaporator temperature sensor circuit for any visible damage or loose connections.

5. Can I continue driving my 2015 GMC Sierra with OBDII code B3933?

- It is generally not recommended to drive for an extended period with this code as it can lead to further issues with the A/C system and discomfort for occupants.

6. How can I repair OBDII code B3933 in my 2015 GMC Sierra?

- Repair may involve repairing or replacing damaged wiring or connectors, testing and potentially replacing the air conditioning evaporator temperature sensor, and clearing the code with a diagnostic tool.

7. Can I reset OBDII code B3933 in my 2015 GMC Sierra without fixing the issue?

- While you can clear the code with a diagnostic tool, it is recommended to address the underlying issue to prevent ongoing A/C problems.

8. What are some DIY tips for addressing OBDII code B3933 in a 2015 GMC Sierra?

- DIY tips include checking for visible damage in the wiring and connectors, ensuring proper connections, and consulting the vehicle's manual for specific troubleshooting steps.

9. How much does it cost to repair OBDII code B3933 in a 2015 GMC Sierra?

- The cost of repair can vary depending on the extent of the issue, but it may involve parts and labor costs for sensor replacement, wiring repairs, or connector fixes.

10. Is OBDII code B3933 specific to the 2015 GMC Sierra?

- Yes, B3933 pertains to the air conditioning evaporator temperature sensor circuit in the 2015 GMC Sierra specifically, although similar issues may occur in other vehicles with similar systems.