Code Definition

B2797 — Immobiliser system communication problem

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

About B2797

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

The transponder key ECU and the ECM communicate over the immobiliser data line to authenticate the key before the engine is allowed to start. DTC B2797 is set when the ECM detects a communication problem with the immobiliser system, where data is being exchanged but is abnormal, corrupted, or intermittently lost rather than entirely absent. This commonly results from a marginal connection, electrical noise, an unstable supply, or a partially failing module that disrupts the authentication handshake. When this code is set the engine may crank but not start, starting may be intermittent, and the...

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