Code Definition

B0419 — Air mix door out of range - actuator 2

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

About B0419

B0419 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 B0419 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 B0419 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

The HVAC control module sets DTC B0419 when it detects that air mix (blend) door actuator 2 has failed to reach its commanded position within the expected travel range. On dual-zone climate systems, actuator 2 is typically the passenger-side blend door, working independently from actuator 1 to allow each occupant to set their own cabin temperature. The actuator is a small DC motor with an integrated feedback potentiometer; when the module commands a new position it monitors the feedback and expects the door to reach the target within a calibrated time and travel window. If the feedback voltage...

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