What does code P257D mean?

Q: What does code P257D mean?

Engine Hood Switch Circuit Range/Performance. P257D indicates that the powertrain control module (PCM) has detected an out-of-range signal from the engine hood switch circuit, which is used to monitor whether the hood is open or closed. The PCM compares the switch input against expected voltage or state thresholds and sets the code when the signal falls outside the valid range for a calibrated period.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P257D

P257DEngine Hood Switch Circuit Range/Performance

P257D indicates that the powertrain control module (PCM) has detected an out-of-range signal from the engine hood switch circuit, which is used to monitor whether the hood is open or closed. The PCM compares the switch input against expected voltage or state thresholds and sets the code when the signal falls outside the valid range for a calibrated period.

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.