Code Definition

B1558 — Ignition Run/Start Circuit Short To Ground

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

About B1558

B1558 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 B1558 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

B1558 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 B1558 code is set by the Body Control Module (BCM) when it detects a short to ground on the ignition run/start signal circuit. When the ignition switch is moved to the run or start position, the BCM expects to see battery voltage on this input, but a short to ground pulls the line low so that even with the switch closed, the BCM continues to read zero or near zero volts. This typically results in a no start, no crank, or intermittent run condition because the BCM cannot confirm the ignition state and refuses to enable downstream functions such as fuel pump prime, starter relay enable, or a...

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