Code Definition

B1363 — Ignition Start Circuit Failure

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1363

B1363 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1363 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1363 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC B1363 indicates that the Body Control Module (BCM) has detected a fault on the ignition start circuit, the input that tells the BCM the ignition switch has been moved to the START (crank) position. The BCM uses this signal to authorise crank request to the starter relay or to gateway the request through onto the engine module on platforms with central crank control, so a fault here typically presents as a no crank, intermittent crank, or extended crank attempt with the customer reporting that turning the key past RUN does nothing. The BCM monitors the start input for the expected voltage r...

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