Code Definition

B2461 — Aux Heater Flame Sensor Circuit Open

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

About B2461

B2461 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 B2461 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and a sensor-related fault — the reported value from the named sensor is out of spec.

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 B2461 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 system uses a flame sensor to monitor combustion within the burn chamber and verify that the fuel fired heater is operating correctly. DTC B2461 sets when the auxiliary heater control module detects an open circuit condition in the flame sensor signal circuit, meaning no electrical continuity exists between the sensor and the module. The flame sensor is typically a thermocouple or thermistor mounted directly in the combustion chamber, and its signal allows the control module to confirm that fuel is igniting and the heater is producing heat. When this code is set, the auxil...

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