What does code P1357 mean?

Q: What does code P1357 mean?

Ignition Diagnostic Monitor Pulsewidth Not Defined. P1357 on Ford vehicles means the powertrain control module (PCM) is receiving an ignition diagnostic monitor (IDM) signal whose pulsewidth falls outside the range the PCM can interpret, so it cannot determine a valid dwell or spark event timing. The PCM monitors the IDM feedback circuit from the ignition control module or coil drivers and flags this code when the pulsewidth is missing, erratic, or electrically undefined rather than a clean square wave.

DTC codes / Ford codes / P1357

P1357 · FordIgnition Diagnostic Monitor Pulsewidth Not Defined

P1357 on Ford vehicles means the powertrain control module (PCM) is receiving an ignition diagnostic monitor (IDM) signal whose pulsewidth falls outside the range the PCM can interpret, so it cannot determine a valid dwell or spark event timing. The PCM monitors the IDM feedback circuit from the ignition control module or coil drivers and flags this code when the pulsewidth is missing, erratic, or electrically undefined rather than a clean square wave.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyProfessional

AreaIgnition system and misfire

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