Code Definition

B2564 — Aux A/C Blower Speed 2 Circuit Short to Ground

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

About B2564

B2564 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 B2564 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and a signal or supply voltage lower than the expected operating range.

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 B2564 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 Auxiliary Climate Control Module monitors the rear A/C blower speed control circuits to detect electrical faults on each individual output. DTC B2564 is set when the module detects that the speed 2 control output is being pulled to chassis ground while the circuit is commanded off or in a high state, indicating a short to ground in the wiring, the resistor pack, or one of the connectors between the module and the blower assembly. The speed 2 path has its own resistor element and dedicated control wire, so a short to ground on this circuit specifically affects the second blower speed step. ...

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