AutoCodes – GMC – B0433 GMC

B0433 GMC 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 GMC 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 8,560

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

What does this mean?

What are the Possible Causes of the DTC B0433 GMC?

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 GMC?

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 GMC 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 B0433 GMC Code

1. What does the OBDII code B0433 on a GMC indicate?

The B0433 code signifies a Temperature Control #3 Feedback Circuit Malfunction, indicating an issue within the feedback circuit of the third temperature control unit in the vehicle's HVAC system.

2. What are the common symptoms of code B0433 in a GMC?

Symptoms may include erratic behavior of the HVAC system, inability to adjust cabin temperature accurately, and possibly the interior cabin temperature being too cold or too hot.

3. What components are typically inspected when diagnosing the B0433 code on a GMC?

Diagnosis usually involves checking the third temperature control module, its associated sensors, wiring, and connections for faults or damages.

4. How serious is the B0433 code on a GMC vehicle?

While it may not affect the drivability of the vehicle, it can cause discomfort due to improper cabin temperature control. It's advisable to address it soon to maintain the comfort and functionality of the HVAC system.

5. Can I drive my GMC with the B0433 code active?

Yes, you can still drive your vehicle; however, you might experience issues with temperature regulation inside the cabin, which can be uncomfortable in extreme weather conditions.

6. What repairs can fix the B0433 code on a GMC?

Repairs might include replacing faulty temperature control modules, repairing or replacing damaged wires or connectors in the feedback circuit, or recalibrating the HVAC system.

7. What could cause the B0433 code to appear on a GMC?

Potential causes include faulty temperature control modules, shorted or open circuits, or poor electrical connections within the HVAC system's feedback circuit.

8. How is the B0433 code diagnosed in a GMC?

A technician will typically use a scan tool to read the fault code and assess the data from the HVAC system. Further inspection involves checking the wiring and connections of the temperature control circuits and testing the functionality of the temperature control modules.

9. After repairing a B0433 code, what steps are taken to ensure the issue is resolved?

Post-repair, a technician will clear the error codes from the system, perform a test drive or operate the HVAC system to ensure it functions correctly, and possibly re-scan to ensure no codes reappear.

10. Are there preventative measures for avoiding the B0433 code on a GMC?

Regular maintenance of the HVAC system, including checking for and addressing any signs of wear or damage in the electrical components and connections, can help prevent issues related to the B0433 code.