What does code P2579 mean?

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2579

P2579Turbocharger/Supercharger Speed Sensor A Circuit Range/Performance

P2579 means the engine control module (ECM) has detected that the turbocharger or supercharger speed sensor A signal is outside the expected range or is not performing reliably. The ECM compares the sensor's reported speed against what the engine's operating conditions predict, and it sets this code when the signal is erratic, stuck, or implausible.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

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.