Code Definition

B0414 — Air temperature/mode door actuator Circuit malfunction

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

About B0414

B0414 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 B0414 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 B0414 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 B0414 when it detects an electrical malfunction in the air temperature (blend) or mode door actuator circuit. These actuators are small DC motors with internal feedback potentiometers — the temperature/blend door regulates the ratio of cold to warm air across the heater core, while the mode door directs that conditioned air to defrost, vent, or floor outlets. The control module continuously monitors the actuator's drive lines and feedback signal, and sets this generic circuit-malfunction code when voltage on either line falls outside the normal operating rang...

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