Code Definition

B1355 — Ignition Run Circuit Failure

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

About B1355

B1355 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 B1355 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.

B1355 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 Body Control Module (BCM) monitors the ignition run circuit, which provides switched battery voltage to the BCM whenever the ignition switch is rotated to the RUN position. The BCM uses this signal to determine when the vehicle is operational so it can enable accessory functions, illuminate warning lamps, control the instrument cluster, and coordinate engine starting through the passive antitheft strategy. DTC B1355 sets when the BCM detects an unexpected voltage state on the ignition run input, such as missing voltage when the key is in RUN, voltage present when the key is OFF, or a signa...

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