Code Definition

B2464 — Aux Heater Start Time Exceeded

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

About B2464

B2464 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 B2464 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 monitors the time taken from start command until the flame sensor confirms sustained combustion. DTC B2464 sets when the heater fails to achieve stable ignition within the manufacturer specified start time window, typically between 60 and 180 seconds depending on the heater model. This indicates the burner did not light at all, lit too late, or lit but failed to maintain combustion long enough for the start sequence to complete. When this code sets, the auxiliary heater locks out further start attempts until the fault is reset, and the operator notices a fau...

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