Code Definition

B2466 — Aux Heater Overheat Counter Overrun/System Locked

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

About B2466

B2466 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.

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 B2466 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 heater control module counts overheat events to protect the heater from repeated thermal damage. DTC B2466 sets when the overheat counter exceeds the manufacturer threshold, typically two to three consecutive overheat shutdown events, and the module permanently locks the heater out as a protective measure. Repeated overheats indicate a persistent cooling or airflow problem that has not been resolved between events. When this code is set, the auxiliary heater will refuse to start regardless of operator input until both the underlying overheat cause is corrected and the overheat co...

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