B0423 on Chevrolet
Air Temperature Control (Passenger/Right Side) Circuit Performance
B0423 on Chevrolet vehicles indicates air temperature control (passenger/right side) circuit performance. Au7o has documented this code across 1 Chevrolet model — most commonly on Camaro. B0423 is an HVAC (climate control) code indicating a problem with the right/passenger-side air temperature control circuit, typically the temperature blend-door actuator that mixes hot and cold air. The climate control module is not getting the expected feedback position from this actuator, so the cabin temperature on that side may not match the setting. This is a comfort/convenience fault, not a safety issue. Typical repair costs on Chevrolet range from $120 to $500, depending on the specific model and root cause.
Common Causes of B0423
- •Faulty passenger-side temperature blend-door actuator
- •Stuck or broken blend door
- •Open, shorted, or chafed actuator wiring
- •Corroded or loose actuator connector
- •Faulty HVAC control module
- •Poor ground to the actuator
- •Mechanical obstruction binding the blend door
B0423 on Chevrolet by Model
Chevrolet Camaro(1 issue)
- HVAC Blend Door Actuator Failure (Clicking/Knocking, Uneven Temperature)2010-2015
The plastic gears inside the HVAC blend-door actuator strip over time, so the actuator motor spins without moving the temperature-mix door. Owners hear a repetitive clicking or knocking behind the dash (often on start-up or when changing temperature) and get uneven output such as cold air on one side and warm on the other, or the temperature not matching the setting. This is a common, well-documented Camaro complaint on Camaro5 and general GM HVAC references, mirroring the same actuator failure across the GM lineup.
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View B0423 across all makes →Frequently Asked Questions
What does B0423 mean on Chevrolet?▼
B0423 stands for "Air Temperature Control (Passenger/Right Side) Circuit Performance." B0423 is an HVAC (climate control) code indicating a problem with the right/passenger-side air temperature control circuit, typically the temperature blend-door actuator that mixes hot and cold air. The climate control module is not getting the expected feedback position from this actuator, so the cabin temperature on that side may not match the setting. This is a comfort/convenience fault, not a safety issue. On Chevrolet specifically, this code is documented across 1 model.
What causes B0423 on Chevrolet vehicles?▼
Common causes on Chevrolet: Faulty passenger-side temperature blend-door actuator, Stuck or broken blend door, Open, shorted, or chafed actuator wiring, Corroded or loose actuator connector, Faulty HVAC control module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B0423 on a Chevrolet?▼
Repair costs on Chevrolet range from $120 to $500, depending on the specific model and root cause.
Which Chevrolet models have B0423 documented?▼
Au7o has documented B0423 on 1 Chevrolet model: Camaro.