What does B0237 mean on a Chevy?

B0237. Air flow control door circuit is open. The mode door gets no command and the body warning light comes on. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0237 on a Chevy?

Open in the air flow control door actuator circuit Unseated or corroded air flow control door actuator connector Broken air flow control door actuator harness behind the dash Binding or stripped air flow control door actuator gears Faulty output inside the HVAC control module

How do I fix B0237 on a Chevy?

Confirm the code with a scan tool and command the air flow control door Wiggle-test the air flow control door harness while watching the command Inspect and reseat the air flow control door actuator connector Test the air flow control door circuit for an open Replace the air flow control door actuator only after the circuit tests pass, then clear the code and retest

Code

B0237

Air flow control door circuit is open

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

B0237. Air flow control door circuit is open. The mode door gets no command 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

Open in the air flow control door actuator circuit
Unseated or corroded air flow control door actuator connector
Broken air flow control door actuator harness behind the dash
Binding or stripped air flow control door actuator gears
Faulty output inside the HVAC control module

Standard procedure

Confirm the code with a scan tool and command the air flow control door
Wiggle-test the air flow control door harness while watching the command
Inspect and reseat the air flow control door actuator connector
Test the air flow control door circuit for an open
Replace the air flow control 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 B0237 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0237
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0237 CHEVROLET Left Temperature Actuator | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes for B0237
Fetched directly. Model and year fitment remain curator claims.
B0237 CHEVROLET Left Temperature Actuator | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes for B0237
Same Chevrolet text as the engine-codes page (both sites share one publisher).

Review note: obdii.pro GM names the general air flow control circuit; the archived Chevrolet page names the left temperature actuator. The circuits differ, so the record uses the GM wording and flags the conflict

Last updated 2026-10-10.

Report a correction for B0237. Include your vehicle, the issue and a source if you have one.