Code Definition

B261A — Front Third Data Failure

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

About B261A

B261A is a generic (obd-ii standard) body diagnostic trouble code recorded for Honda vehicles. 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 B261A 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 Body Control Module (BCM) and related multiplex control units communicate over the CAN network using segmented data frames. DTC B261A is stored when the BCM determines that the front third data segment expected from another control unit (commonly related to front body or driver side systems) is missing, corrupted, or fails CRC or sequence validation for a calibrated period. This condition indicates a data integrity or communication fault rather than a direct sensor rationality issue. When the code is set, the driver may notice inoperative or erratic body functions controlled across the net...

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