Code Definition

B2462 — Aux Heater Flame Out Fault

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

About B2462

B2462 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 B2462 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 flame sensor signal during operation to confirm that combustion remains stable inside the burn chamber. DTC B2462 sets when the module detects that the flame has extinguished unexpectedly while the heater was running, indicating a loss of combustion before the normal shutdown sequence. This condition can be triggered by fuel supply interruptions, combustion air restrictions, glow plug or igniter failures during reignition attempts, or excessive carbon accumulation in the burn chamber. When this code is set, the auxiliary heater will lock out fur...

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