Code Definition

B2471 — Interior Fan Control Circuit Open

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

About B2471

B2471 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 B2471 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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 B2471 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 Body Control Module (BCM) monitors the interior fan control circuit which regulates blower motor operation for the HVAC system. DTC B2471 is set when the BCM detects an open circuit in the interior fan control output, meaning the expected current flow to or from the blower motor control device cannot be established. The interior fan is typically controlled either through a resistor pack with discrete speed taps, a solid state blower control module driven by a PWM signal, or in some vehicles directly by the HVAC head unit. When this code is active, the driver may notice the blower fails to ...

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