AutoCodes – Chevrolet – B3933 Chevrolet

B3933 Chevrolet 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 Chevrolet 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 17,579

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 Chevrolet 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 Chevrolet - Air Conditioning Evaporator Temperature Sensor Circuit - AutoCodes.com — B3933 Chevrolet Code - Air Conditioning Evaporator Temperature Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC B3933 Chevrolet?

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 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 B3933 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 B3933 Chevrolet code?

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

Need Help with the Code?

Get the B3933 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B3933 2014 Chevrolet Silverado — Air Conditioning Evaporator Temperature Sensor Circuit
B3933 2015 Chevrolet Silverado — Air Conditioning Evaporator Temperature Sensor Circuit
B3933 2016 Chevrolet Silverado — Air Conditioning Evaporator Temperature Sensor Circuit
B3933 2017 Chevrolet Silverado — Air Conditioning Evaporator Temperature Sensor Circuit
B3933 2018 Chevrolet Silverado — Air Conditioning Evaporator Temperature Sensor Circuit

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 Chevrolet Code

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

- Common symptoms include inconsistent cooling performance from the air conditioning system, erratic temperature readings on the control panel, or the AC system not functioning at all.

2. What typically causes the OBDII code B3933 in a Chevrolet related to the Air Conditioning Evaporator Temperature Sensor Circuit?

- The code is usually triggered by a faulty air conditioning evaporator temperature sensor, damaged wiring or connectors in the sensor circuit, or a malfunction in the HVAC control module.

3. How can I diagnose the issue triggering the OBDII code B3933 in a Chevrolet related to the Air Conditioning Evaporator Temperature Sensor Circuit?

- Diagnosis involves using a scan tool to retrieve the trouble codes, testing the air conditioning evaporator temperature sensor for proper resistance values, and inspecting the sensor circuit for any visible damage.

4. Can I drive my Chevrolet with the OBDII code B3933 related to the Air Conditioning Evaporator Temperature Sensor Circuit?

- While you may be able to drive the vehicle with this code, it is recommended to address the issue promptly to prevent further damage to the air conditioning system and ensure optimal cooling performance.

5. What are some repair tips for resolving the OBDII code B3933 in a Chevrolet related to the Air Conditioning Evaporator Temperature Sensor Circuit?

- Repair tips include replacing the faulty air conditioning evaporator temperature sensor, repairing any damaged wiring or connectors, and clearing the trouble codes with a scan tool to reset the system.

6. Can I fix the OBDII code B3933 related to the Air Conditioning Evaporator Temperature Sensor Circuit in my Chevrolet at home?

- Depending on your level of automotive repair experience, you may be able to address this issue at home by following the manufacturer's diagnostic and repair procedures outlined in the service manual.

7. How much does it cost to repair the OBDII code B3933 in a Chevrolet related to the Air Conditioning Evaporator Temperature Sensor Circuit?

- The cost of repair can vary based on the extent of the issue, the parts required, and whether you choose to do the repair yourself or take it to a professional mechanic. It is best to obtain quotes from local repair shops for an accurate estimate.

8. What happens if I ignore the OBDII code B3933 in my Chevrolet related to the Air Conditioning Evaporator Temperature Sensor Circuit?

- Ignoring this code can lead to decreased cooling performance, potential damage to other components of the air conditioning system, and discomfort while driving in hot weather conditions. It is advisable to address the issue promptly.