What does B0150 mean on a Chevy?

B0150. Rear auxiliary mode actuator feedback circuit malfunction. The HVAC module cannot confirm the door position and sets a body warning. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0150 on a Chevy?

Rear auxiliary mode actuator position sensor failed or worn Rear auxiliary mode door binding and stalling the actuator Open or short in the rear auxiliary mode actuator feedback circuit Corroded or loose rear auxiliary mode actuator connector Faulty feedback input inside the rear auxiliary HVAC control module

How do I fix B0150 on a Chevy?

Confirm the code with a scan tool and watch the rear auxiliary mode door feedback voltage Command the rear auxiliary mode door through full travel and note any jump in feedback Inspect the rear auxiliary mode actuator connector for corrosion and pin damage Test the rear auxiliary mode actuator feedback circuit with a multimeter Check the rear auxiliary mode door for binding before condemning the actuator Replace the rear auxiliary mode actuator or HVAC module only if the circuits test good, then clear the code and retest

Code

B0150

Rear auxiliary mode actuator feedback circuit malfunction

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

B0150. Rear auxiliary mode actuator feedback circuit malfunction. The HVAC module cannot confirm the door position and sets a body warning. This Chevy-enhanced code applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

Findings, check these first

Rear auxiliary mode actuator position sensor failed or worn
Rear auxiliary mode door binding and stalling the actuator
Open or short in the rear auxiliary mode actuator feedback circuit
Corroded or loose rear auxiliary mode actuator connector
Faulty feedback input inside the rear auxiliary HVAC control module

Standard procedure

Confirm the code with a scan tool and watch the rear auxiliary mode door feedback voltage
Command the rear auxiliary mode door through full travel and note any jump in feedback
Inspect the rear auxiliary mode actuator connector for corrosion and pin damage
Test the rear auxiliary mode actuator feedback circuit with a multimeter
Check the rear auxiliary mode door for binding before condemning the actuator
Replace the rear auxiliary mode actuator or HVAC module only if the circuits test good, 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 B0150 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0150
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0150 CHEVROLET Air Flow Position Feedback #3 Circuit Malfunction | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes
Fetched directly. Model and year fitment remain curator claims.
B0150 CHEVROLET Air Flow Position Feedback #3 Circuit Malfunction | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes
Same Chevrolet text as the engine-codes page (both sites share one publisher).

Last updated 2026-10-10.

Report a correction for B0150. Include your vehicle, the issue and a source if you have one.