What does B0249 mean on a Chevy?

B0249. Heater, defrost and A/C door range fault. The door moves outside its expected travel and the body warning light comes on. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0249 on a Chevy?

Heater, defrost and A/C door binding and stalling its actuator Heater, defrost and A/C door actuator position sensor out of calibration Open or short in the heater, defrost and A/C door actuator circuit Corroded or loose heater, defrost and A/C door actuator connector Faulty output inside the HVAC control module

How do I fix B0249 on a Chevy?

Confirm the code with a scan tool and watch the heater, defrost and A/C door command and position Command the heater, defrost and A/C door through full travel and note where it stalls Inspect and reseat the heater, defrost and A/C door actuator connector Move the heater, defrost and A/C door by hand with the actuator removed to check for binding Replace the heater, defrost and A/C door actuator only after the circuit tests pass, then clear the code and retest

Code

B0249

Heater, defrost and A/C door range fault

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

B0249. Heater, defrost and A/C door range fault. The door moves outside its expected travel 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

Heater, defrost and A/C door binding and stalling its actuator
Heater, defrost and A/C door actuator position sensor out of calibration
Open or short in the heater, defrost and A/C door actuator circuit
Corroded or loose heater, defrost and A/C door actuator connector
Faulty output inside the HVAC control module

Standard procedure

Confirm the code with a scan tool and watch the heater, defrost and A/C door command and position
Command the heater, defrost and A/C door through full travel and note where it stalls
Inspect and reseat the heater, defrost and A/C door actuator connector
Move the heater, defrost and A/C door by hand with the actuator removed to check for binding
Replace the heater, defrost and A/C door actuator only after the 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: qualified. Read the source limits below.

Code B0249 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0249
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0249 CHEVROLET Air Flow Control 3 Circuit Range | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes for B0249
Fetched directly. Model and year fitment remain curator claims.
B0249 CHEVROLET Air Flow Control 3 Circuit Range | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes for B0249
Same Chevrolet text as the engine-codes page (both sites share one publisher).

Review note: obdii.pro GM names the heater, defrost and A/C door range error; the archived Chevrolet page names air flow control 3 circuit range. The circuits differ, so the record uses the GM wording and flags the conflict

Last updated 2026-10-10.

Report a correction for B0249. Include your vehicle, the issue and a source if you have one.