What causes B0446 on a Chevy?

Failed passenger side right air temperature actuator Open or short in the passenger side right actuator control circuit Corroded passenger side right actuator connector Right air mix door binding in its travel Faulty right output in the HVAC control module

How do I fix B0446 on a Chevy?

Confirm the code with a scan tool Inspect and reseat the passenger side right actuator connector Test the passenger side right actuator control circuit for opens and shorts Command the right air mix door with the scan tool and watch its travel Replace the right air temperature actuator only after circuit tests pass, then clear the code and retest

Code

B0446

Right air temperature actuator circuit fault

Q: What does B0446 mean on a Chevy?

B0446. Right air temperature actuator circuit fault. The passenger side air mix door cannot reach the commanded position and the body warning light comes on.. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

Category: Body
Severity: Body Warning Light
Applies to: Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code
Related: No single generic twin. See OBD Codes List

What it means

B0446. Right air temperature actuator circuit fault. The passenger side air mix door cannot reach the commanded position and the body warning light comes on.. This Chevy-enhanced code applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

Findings, check these first

Failed passenger side right air temperature actuator
Open or short in the passenger side right actuator control circuit
Corroded passenger side right actuator connector
Right air mix door binding in its travel
Faulty right output in the HVAC control module

Standard procedure

Confirm the code with a scan tool
Inspect and reseat the passenger side right actuator connector
Test the passenger side right actuator control circuit for opens and shorts
Command the right air mix door with the scan tool and watch its travel
Replace the right air temperature actuator only after circuit tests pass, then clear the code and retest

Look up another code

Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.

Sources and review

Review: checked against the recorded source material.

B0446 CHEVROLET Code: Meaning, Causes, and Symptoms | OBD2 Codes - OBD2 Codes
live reference page (obd2-codes.co)
Supports: CHEVROLET and GM-family meaning and likely causes for B0446
Fetched directly. B0446 reads "Right Air Temperature Actuator".
Code B0446 meaning and causes | OBDII.pro
live reference page (obdii.pro)
Supports: independent corroboration of the GM meaning
Fetched directly. obdii.pro is a separate publisher and gives the GM meaning as: Auxiliary heater fuel pump circuit high More details about the error B0446 and possible reasons for its occurrence.

Source caveat: obdii.pro lists GM: Auxiliary heater fuel pump circuit high, which disagrees with the obd2-codes.co right air temperature actuator meaning. The obd2-codes.co meaning is used for this entry; verify against the vehicle service information.

Last updated 2026-10-10.

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