AutoCodes – Buick – B3933 Buick

B3933 Buick 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 Buick 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 1,000

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

What does this mean?

What are the Possible Causes of the DTC B3933 Buick?

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 Buick?

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 Buick 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.

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Need Help with the Code?

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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 Buick Code

1. What are common symptoms of OBDII code B3933 in a Buick related to the air conditioning evaporator temperature sensor circuit?

- Common symptoms include inconsistent cooling performance, warm air blowing from the vents, and the air conditioning system not functioning properly.

2. What can cause OBDII code B3933 to trigger in a Buick's air conditioning system?

- The code can be triggered by a faulty air conditioning evaporator temperature sensor, damaged wiring or connectors, or issues with the sensor circuit.

3. How can I diagnose the cause of OBDII code B3933 related to the air conditioning evaporator temperature sensor circuit in my Buick?

- Diagnosis typically involves checking the sensor's resistance, inspecting wiring for damage, and verifying proper sensor circuit operation using a multimeter.

4. What are some repair tips for resolving OBDII code B3933 in a Buick's air conditioning system?

- Repair tips may include replacing the faulty air conditioning evaporator temperature sensor, repairing damaged wiring or connectors, and clearing the trouble code with an OBDII scanner.

5. Can driving with OBDII code B3933 present in a Buick cause any further damage to the vehicle?

- Continuing to drive with this code may result in poor air conditioning performance, increased fuel consumption, and potential damage to other components in the air conditioning system.

6. Is it safe to reset OBDII code B3933 in a Buick's air conditioning system without addressing the underlying issue?

- While resetting the code may temporarily clear the warning light, it is important to diagnose and repair the root cause to ensure proper functioning of the air conditioning system.

7. How much does it typically cost to repair OBDII code B3933 in a Buick related to the air conditioning evaporator temperature sensor circuit?

- The cost of repair can vary depending on the specific issue, but it may involve sensor replacement, wiring repairs, or connector fixes, with costs ranging from $50 to $200 or more.

8. Are there any preventive measures I can take to avoid encountering OBDII code B3933 in my Buick's air conditioning system?

- Regular maintenance of the air conditioning system, such as checking for leaks, ensuring proper refrigerant levels, and inspecting sensor connections, can help prevent issues leading to this code.

9. Will OBDII code B3933 in a Buick's air conditioning system affect the overall drivability of the vehicle?

- While the code is related to the air conditioning system, addressing it promptly is recommended to maintain optimal comfort and functionality while driving the vehicle.

10. Can a DIY enthusiast with basic automotive knowledge repair OBDII code B3933 in a Buick's air conditioning system?

- Depending on the specific issue, DIY repairs such as sensor replacement and basic wiring checks may be possible for those with some automotive experience, but professional help is recommended for complex diagnosis and repairs.