Skip to content
Book on WhatsApp

P05BD

Stop-Start Mode Switch Circuit Range or Performance

Same as P05BC with the input in plausible range yet not matching the expected toggle behaviour - typically a worn switch contact.

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

Common causes

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

  • Contact resistance driftedCommon

Parts involved

  • Stop Start Switch

P05BD 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.