What does code P1578 mean?

Q: What does code P1578 mean?

ETC Power Less Than Demand. P1578 on a Ford means the electronic throttle control (ETC) system cannot deliver the throttle opening the powertrain control module (PCM) is requesting, so actual throttle position falls short of the commanded value. The PCM compares the throttle position sensor (TPS) feedback against its demand and sets the code when the shortfall persists beyond a calibrated time.

DTC codes / Ford codes / P1578

P1578 · FordETC Power Less Than Demand

P1578 on a Ford means the electronic throttle control (ETC) system cannot deliver the throttle opening the powertrain control module (PCM) is requesting, so actual throttle position falls short of the commanded value. The PCM compares the throttle position sensor (TPS) feedback against its demand and sets the code when the shortfall persists beyond a calibrated time.

SystemPowertrain

Code typeFord specific

SeverityHigh

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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