AutoCodes – Pontiac – B3933 Pontiac

B3933 Pontiac 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 Pontiac 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 572

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

What does this mean?

What are the Possible Causes of the DTC B3933 Pontiac?

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 Pontiac?

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 Pontiac 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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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 Pontiac Code

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

The common symptoms include a malfunctioning air conditioning system, inconsistent cooling performance, and in some cases, the AC may not blow cold air at all.

2. What are the possible causes of OBDII code B3933 in a Pontiac?

Possible causes include a faulty evaporator temperature sensor, damaged wiring or connectors in the sensor circuit, or a problem with the AC control module.

3. How can I diagnose the issue related to OBDII code B3933 in my Pontiac?

Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the evaporator temperature sensor and its wiring for any visible damage, and testing the sensor's resistance to determine if it's functioning properly.

4. Can I repair OBDII code B3933 in my Pontiac myself?

Repairing this code may require replacing the faulty evaporator temperature sensor, repairing damaged wiring or connectors, or resetting the AC control module. Depending on your experience and tools, you may be able to perform the repair yourself.

5. Are there any tips for preventing OBDII code B3933 in my Pontiac?

Regular maintenance of the air conditioning system, checking for any signs of wear or damage in the sensor circuit, and addressing any cooling issues promptly can help prevent this code from appearing.

6. How critical is it to address OBDII code B3933 in a Pontiac?

While the vehicle may still be operable with this code, ignoring the issue can lead to discomfort while driving, reduced AC performance, and potential damage to other components in the air conditioning system over time.

7. Can OBDII code B3933 in a Pontiac affect fuel efficiency?

Yes, a malfunctioning air conditioning system due to this code can cause the AC compressor to work harder, leading to increased fuel consumption and reduced fuel efficiency.

8. Is it safe to continue driving my Pontiac with OBDII code B3933 present?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue as soon as possible to avoid further AC problems and discomfort while driving.

9. How long does it typically take to repair OBDII code B3933 in a Pontiac?

The repair time can vary depending on the exact cause of the issue and your expertise. It may take anywhere from 30 minutes to a few hours to diagnose and repair the problem.

10. Will resetting the OBDII code B3933 in my Pontiac make the issue go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying problem is not addressed, the code is likely to reappear. It's important to diagnose and fix the root cause of the issue for a permanent solution.