What does code P05FB mean?

Q: What does code P05FB mean?

Stop-Start Status Signal Circuit High. P05FB means the engine control module (ECM) has detected a high voltage condition on the stop-start status signal circuit, which is the wire that tells the module whether the vehicle's automatic stop-start system is active, inhibited, or faulted. The ECM expects a specific voltage range on this signal line, and a reading above the normal threshold indicates an open circuit, a short to voltage, or a failed component on that signal path.

DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P05FB

P05FBStop-Start Status Signal Circuit High

P05FB means the engine control module (ECM) has detected a high voltage condition on the stop-start status signal circuit, which is the wire that tells the module whether the vehicle's automatic stop-start system is active, inhibited, or faulted. The ECM expects a specific voltage range on this signal line, and a reading above the normal threshold indicates an open circuit, a short to voltage, or a failed component on that signal path.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.