Code Definition

B2797 — Immobiliser system communication problem

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

About B2797

B2797 is a generic (obd-ii standard) body diagnostic trouble code recorded for Toyota 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 B2797 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

This DTC is stored by the Toyota immobiliser ECU or certification (smart key) ECU when it detects a failure in its communication with the Engine Control Module (ECM) during the key authentication process. The immobiliser system and the ECM exchange encrypted data to verify key validity before the engine is permitted to run. B2797 sets when this communication link is disrupted, delayed, or returns invalid data, which usually indicates a wiring or connector fault on the dedicated communication lines, a network problem, or a failed module. When the code is active the engine will be blocked from s...

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