HVAC actuator supply voltage fault
What it means
B023A. HVAC actuator supply voltage fault. The actuators lose their reference voltage and the HVAC module sets a body warning light. This Chevy-enhanced code applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.
Findings, check these first
- Open in the actuator supply voltage circuit
- Blown or corroded HVAC control fuse
- Corroded actuator connectors
- Chafed supply harness behind the dash
- Faulty output inside the HVAC control module
Standard procedure
- Confirm the code with a scan tool
- Check the HVAC fuses and the actuator supply voltage
- Inspect and reseat the actuator connectors
- Repair damaged supply wiring before replacing any parts
- Replace the HVAC module only after circuit tests pass
Look up another code
Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.
Sources and review
Review: qualified. Read the source limits below.
- B023A CHEVROLET HVAC Actuators Supply Voltage | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes for B023A
Fetched directly. Model and year fitment remain curator claims.
- B023A CHEVROLET HVAC Actuators Supply Voltage | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes for B023A
Same Chevrolet text as the engine-codes page (both sites share one publisher).
Review note: No live obdii.pro GM entry. The engine-codes and autocodes pages share one publisher and both name the HVAC actuators supply voltage, so the meaning rests on one source
Last updated 2026-09-29.
Report a correction for B023A. Include your vehicle, the issue and a source if you have one.