What does B0270 mean on a Chevy?

B0270. Recirculation air flow door circuit low. The command signal to that door reads low and the body warning light comes on. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0270 on a Chevy?

Recirculation air flow door command signal shorted to ground Failed recirculation air flow door actuator pulling the command signal low Corroded or loose recirculation air flow door actuator connector Binding or stripped recirculation air flow door actuator gears Faulty output inside the HVAC control module

How do I fix B0270 on a Chevy?

Confirm the code with a scan tool and command the recirculation air flow door Measure the recirculation air flow door command voltage at the actuator Inspect and reseat the recirculation air flow door actuator connector Test the recirculation air flow door command circuit for a short to ground Replace the recirculation air flow door actuator only after the circuit tests pass, then clear the code and retest

Code

B0270

Recirculation air flow door circuit low

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

B0270. Recirculation air flow door circuit low. The command signal to that door reads low 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

Recirculation air flow door command signal shorted to ground
Failed recirculation air flow door actuator pulling the command signal low
Corroded or loose recirculation air flow door actuator connector
Binding or stripped recirculation air flow door actuator gears
Faulty output inside the HVAC control module

Standard procedure

Confirm the code with a scan tool and command the recirculation air flow door
Measure the recirculation air flow door command voltage at the actuator
Inspect and reseat the recirculation air flow door actuator connector
Test the recirculation air flow door command circuit for a short to ground
Replace the recirculation air flow 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: checked against the recorded source material.

Code B0270 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0270
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0270 CHEVROLET Air Flow Control 7 Circuit Low | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes for B0270
Fetched directly. Model and year fitment remain curator claims.
B0270 CHEVROLET Air Flow Control 7 Circuit Low | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes for B0270
Same Chevrolet text as the engine-codes page (both sites share one publisher).

Last updated 2026-10-10.

Report a correction for B0270. Include your vehicle, the issue and a source if you have one.