Temperature control 3 feedback circuit malfunction
What it means
B0433. Temperature control 3 feedback circuit malfunction. The auxiliary HVAC module loses the rear air mix door 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 position feedback sensor in the rear auxiliary air temperature actuator
- Open or short in the rear temperature feedback circuit
- Corroded rear auxiliary actuator connector
- Rear air mix door binding and stalling the actuator
- Faulty feedback input in the auxiliary HVAC control module
Standard procedure
- Confirm the code with a scan tool
- Inspect and reseat the rear auxiliary actuator connector
- Test the rear temperature feedback circuit for opens and shorts
- Command the rear air mix door and compare commanded position to feedback
- Replace the rear auxiliary actuator or auxiliary HVAC control module only after circuit tests pass, then clear the code and retest
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Sources and review
Review: checked against the recorded source material.
- B0433 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 B0433
Fetched directly. B0433 reads "Temperature Control #3 Feedback Circuit Malfunction".
- Code B0433 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: Temperature control #3 (rear) feedback circuit malfunction More details about the error B0433 and possible reasons for its occurrence.
Last updated 2026-10-10.
Report a correction for B0433. Include your vehicle, the issue and a source if you have one.