What does B0248 mean on a Chevy?

B0248. Mode door inoperative fault. The HVAC module cannot move the mode door and the body warning light comes on. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0248 on a Chevy?

Binding mode door with stripped actuator gears Mode door actuator with a failed motor Open or short in the mode door actuator circuit Corroded or loose mode door actuator connector Faulty output inside the HVAC control module

How do I fix B0248 on a Chevy?

Confirm the code with a scan tool and command the mode door through full travel Listen for the mode door actuator and check for movement at the outlets Inspect and reseat the mode door actuator connector Move the mode door by hand with the actuator removed to check for binding Replace the mode door actuator only after the circuit tests pass, then clear the code and retest

Code

B0248

Mode door inoperative 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

B0248. Mode door inoperative fault. The HVAC module cannot move the mode door 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

Binding mode door with stripped actuator gears
Mode door actuator with a failed motor
Open or short in the mode door actuator circuit
Corroded or loose mode door actuator connector
Faulty output inside the HVAC control module

Standard procedure

Confirm the code with a scan tool and command the mode door through full travel
Listen for the mode door actuator and check for movement at the outlets
Inspect and reseat the mode door actuator connector
Move the mode door by hand with the actuator removed to check for binding
Replace the mode 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 B0248 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0248
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0248 CHEVROLET Air Flow Control 3 Circuit | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes for B0248
Fetched directly. Model and year fitment remain curator claims.
B0248 CHEVROLET Air Flow Control 3 Circuit | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes for B0248
Same Chevrolet text as the engine-codes page (both sites share one publisher).

Review note: obdii.pro GM names the mode door inoperative error; the archived Chevrolet page names air flow control 3 circuit. The circuits differ, so the record uses the GM wording and flags the conflict

Last updated 2026-10-10.

Report a correction for B0248. Include your vehicle, the issue and a source if you have one.