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P05F9

Stop-Start Status Signal Circuit

A general circuit fault on the stop-start status signal - the bus or hardwire that tells other modules whether the engine is auto-stopped or running.

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: easy

Common causes

Ordered by how often each turns out to be the cause.

  • Open in signal lineCommon

Parts involved

  • Stop Start Status Signal

P05F9 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.