AutoCodes – GMC – B0446 GMC

B0446 GMC Code - Right Air Temperature Actuator

Quick Answer

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module commands the left air temperature actuator movement with one of three voltage signals applied to the left air temperature door control circuit. Common causes include Faulty Right Air Temperature Actuator, Right Air Temperature Actuator harness is open or shorted, Right 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: B0446 GMC indicates Right Air Temperature Actuator.
Common causes: Common causes include Faulty Right Air Temperature Actuator, Right Air Temperature Actuator harness is open or shorted, Right 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 1,041

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 B0446 GMC Description

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module commands the left air temperature actuator movement with one of three voltage signals applied to the left air temperature door control circuit. A low voltage of zero volts moves the left air temperature door toward full cold. A voltage of 2.5 volts stops the door. A voltage of 5 volts moves the left air temperature door toward full hot. The HVAC control module determines the current position of the actuator by monitoring the feedback voltage of the left air temperature door position signal circuit. The feedback potentiometer position is a function of the actuator position. A high voltage indicates a full cold left air temperature door position. A low voltage indicates a full hot left air temperature door position. The HVAC control module controls the left air temperature door position in order to maintain the selected air temperature.
Whenever the HVAC control module keep alive memory battery power is interrupted, the HVAC control module will perform a recalibration of the actuators. During recalibration, the HVAC control module will drive the actuators to their minimum and maximum travel extremes. The HVAC control module will then calculate a travel range from this data and compare it to a calibrated range within the HVAC control module. If the actual travel range is not within the calibrated expected range, the actuator will be considered not calibrated and the DTC will set.

OBDII Code B0446 GMC - Right Air Temperature Actuator - AutoCodes.com — B0446 GMC Code - Right Air Temperature Actuator

What does this mean?

What are the Possible Causes of the DTC B0446 GMC?

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

How to Fix the DTC B0446 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 B0446 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 B0446 GMC Code

1. What are the common symptoms of OBDII code B0446 GMC (Right Air Temperature Actuator)?

The common symptoms include inconsistent air temperature from the right side vents, warm air blowing from the right side when cool air is selected, or vice versa.

2. What causes OBDII code B0446 GMC to trigger?

The code is usually triggered when there is a malfunction in the right air temperature actuator, which controls the temperature of the air coming from the right side vents.

3. How can I diagnose the issue related to OBDII code B0446 GMC?

Diagnosing the issue involves using a scan tool to read the code, checking the right air temperature actuator for proper functionality, and inspecting the wiring and connections for any issues.

4. Can I still drive my vehicle with OBDII code B0446 GMC present?

While it may be possible to drive the vehicle with this code present, it is recommended to address the issue promptly to avoid discomfort and potential further damage to the HVAC system.

5. What are some repair tips for fixing OBDII code B0446 GMC?

Repair tips include checking and replacing the right air temperature actuator if necessary, ensuring proper calibration of the actuator, and clearing the code after the repair is completed.

6. Is it possible to reset OBDII code B0446 GMC without fixing the underlying issue?

While it is possible to clear the code temporarily, it will likely reappear until the root cause of the problem, such as a faulty right air temperature actuator, is addressed.

7. How much does it typically cost to repair OBDII code B0446 GMC?

The cost of repairing this code can vary depending on the specific issue, labor rates, and parts needed. It is recommended to consult with a professional mechanic for an accurate estimate.

8. Can extreme temperatures or weather conditions affect OBDII code B0446 GMC?

Extreme temperatures or weather conditions may exacerbate issues related to the right air temperature actuator, leading to more noticeable symptoms and potentially triggering the OBDII code.

9. Are there any preventive measures to avoid OBDII code B0446 GMC from recurring?

Regular maintenance of the HVAC system, including checking and calibrating the air temperature actuators, can help prevent the recurrence of this OBDII code.

10. How long does it typically take to repair OBDII code B0446 GMC?

The repair time can vary depending on the extent of the issue and the availability of parts. In general, a professional mechanic can usually address this problem within a few hours to a day.