Code Definition

B2470 — Interior Fan Control Circuit Short to Ground

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

About B2470

B2470 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 B2470 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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 B2470 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 drives the interior blower fan motor through a control circuit, applying a switched signal (either low side ground or PWM) to command fan speed and operation. DTC B2470 sets when the module detects the fan control circuit is shorted to chassis ground outside of commanded operation, resulting in excessive current draw or the fan operating without command. Depending on system design, the fault may be detected through current monitoring, voltage feedback on the control pin, or driver protection circuitry tripping. When this code is set, the interior fan may run continuousl...

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