AutoCodes – Hummer – B0433 Hummer

B0433 Hummer Code - Temperature Control #3 Feedback Circuit Malfunction

Quick Answer

The actuators operate using 5 circuits. Common causes include Faulty Auxiliary Air Temperature Actuator, Auxiliary Air Temperature Actuator harness is open or shorted, Auxiliary Air Temperature Actuator 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: B0433 Hummer indicates Temperature Control #3 Feedback Circuit Malfunction.
Common causes: Common causes include Faulty Auxiliary Air Temperature Actuator, Auxiliary Air Temperature Actuator harness is open or shorted, Auxiliary Air Temperature Actuator 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 2,464

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 B0433 Hummer Description

The actuators operate using 5 circuits. A 5-volt reference, low reference, signal circuit and two bi-directional 0 or 12 volt control circuits. The Heating, Ventilation, and Air Conditioning (HVAC) Control Module supplies a low reference and 5-volt reference to the potentiometer. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. As the actuator door changes position the door position signal circuit voltage also changes. The two bi-directional control circuits enable the actuator to operate. Both circuits are set to 0 volts when the HVAC control module detects, from the feedback potentiometer, that the actuator is in the desired position. In order to move the actuator, the HVAC control module switches the appropriate control circuit to 12 volts.

OBDII Code B0433 Hummer - Temperature Control #3 Feedback Circuit Malfunction - AutoCodes.com — B0433 Hummer Code - Temperature Control #3 Feedback Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B0433 Hummer?

Faulty Auxiliary Air Temperature Actuator
Auxiliary Air Temperature Actuator harness is open or shorted
Auxiliary Air Temperature Actuator circuit poor electrical connection
Faulty Auxiliary Heating and Cooling Systems (HVAC) Control Module

How to Fix the DTC B0433 Hummer?

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 B0433 Hummer 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 B0433 Hummer code?

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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 B0433 Hummer Code

1. What are the common symptoms of OBDII code B0433 in a Hummer related to the Temperature Control #3 Feedback Circuit Malfunction?

- Common symptoms include erratic temperature readings on the HVAC system, inconsistent climate control, and potential issues with the heating and cooling functions.

2. What are the possible causes of the B0433 OBDII code in a Hummer?

- The code B0433 can be triggered by a faulty temperature sensor, damaged wiring in the feedback circuit, a malfunctioning HVAC control module, or a poor connection in the system.

3. How can I diagnose the Temperature Control #3 Feedback Circuit Malfunction in my Hummer when the B0433 code is detected?

- To diagnose the issue, you can use an OBDII scanner to read the specific code, visually inspect the wiring and connectors for any damage, test the temperature sensor for proper functionality, and check the HVAC control module for any faults.

4. Can I continue driving my Hummer with the B0433 OBDII code related to the Temperature Control #3 Feedback Circuit Malfunction?

- It is not recommended to ignore the B0433 code as it can lead to further HVAC system issues. It is best to address the problem promptly to prevent any potential long-term damage.

5. How can I repair the Temperature Control #3 Feedback Circuit Malfunction in my Hummer when the B0433 code appears?

- Repair options include replacing the faulty temperature sensor, repairing or replacing damaged wiring, addressing any issues with the HVAC control module, and ensuring all connections are secure and functioning correctly.

6. Is it possible to reset the B0433 OBDII code in a Hummer without addressing the underlying issue?

- While you can clear the code temporarily using an OBDII scanner, the issue causing the B0433 code will persist until properly diagnosed and repaired.

7. Will the B0433 OBDII code in a Hummer reset itself over time if the underlying issue is not fixed?

- The code may clear temporarily, but it is likely to reappear if the root cause of the Temperature Control #3 Feedback Circuit Malfunction is not resolved.

8. Are there any common mistakes to avoid when trying to fix the B0433 code in a Hummer?

- Common mistakes include overlooking simple wiring issues, assuming the temperature sensor is the only problem, and neglecting to check the HVAC control module for faults.

9. How can I prevent the B0433 OBDII code related to the Temperature Control #3 Feedback Circuit Malfunction from occurring in my Hummer in the future?

- Regular maintenance checks, keeping an eye on HVAC system performance, and addressing any temperature control issues promptly can help prevent the recurrence of the B0433 code.

10. Can a DIY enthusiast with basic automotive knowledge fix the Temperature Control #3 Feedback Circuit Malfunction causing the B0433 code in a Hummer?

- Depending on the specific issue, a DIY enthusiast with some automotive knowledge may be able to address simple wiring problems or replace the temperature sensor. However, more complex issues may require professional assistance.