Code Definition

B1555 — Ignition Run/Start Circuit Failure

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

About B1555

B1555 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 B1555 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.

B1555 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

The B1555 code indicates a failure detected by the Body Control Module (BCM) in the ignition run/start circuit. This circuit carries the run and start signal from the ignition switch through to modules that depend on knowing the ignition state, including the BCM, instrument cluster, and powertrain control module. The BCM monitors the input from the ignition switch and sets B1555 when the expected voltage state is not seen during cranking or run conditions, indicating an open, short, or intermittent fault in the wire or switch contacts. When this code is set, the vehicle may exhibit a no start ...

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