Code Definition

B0228 — Air Mix Door Actuator Circuit Range/Performance

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B0228

B0228 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B0228 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B0228 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This DTC is set by the HVAC control module when it detects a range or performance issue on the air mix (temperature blend) door actuator circuit. The blend door is driven by a small electric actuator that contains both a motor and a feedback potentiometer; the module commands the actuator to a target position and watches the feedback signal to confirm the door has actually moved there. The fault is triggered when the feedback voltage does not correspond to the commanded position within an expected time and tolerance, indicating slow movement, a stuck door, or a feedback signal that is drifting...

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