Code Definition

B2517 — Emergency Power Off System Faulted

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

About B2517

B2517 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 B2517 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) monitors the Emergency Power Off (EPO) system that disables critical circuits such as the fuel pump in the event of a collision. DTC B2517 is set when the BCM detects a fault in the EPO system, such as an open or shorted inertia switch input, an implausible state on the crash signal line, or a failure of the EPO output to respond as expected. The EPO system is normally triggered by an inertia switch, an airbag deployment signal, or a dedicated crash sensor input, and acts to cut power to the fuel pump and sometimes the starter to reduce fire risk after a collision...

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