01 The Inner Workings of Automotive Airbags: From Sensors to I… • 02 What Does It Mean When Your Car Won't Go Over 3,000 RPM? • 03 How Old Fuel Can Harm Your Engine and What to Do About It • 04 Drivers Are Left Stunned After Discovering The Real Purpose… • 05 U0018: Medium Speed CAN Communication Bus (-) shorted to Bu… • 06 Understanding and Troubleshooting Timing Belt Noises • 07 How Automatic Transmissions Decide When to Shift • 08 Ford Dealerships: A Global Network Across Six Continents • 09 How Far Can You Drive a Car with a Cylinder Misfire? • 10 Why is your car shaking when you brake at high speeds? •

DTC codes / Ford codes / P1431

P1431 · FordMisfire Monitor Disabled Unable to Learn Trigger Wheel Profile

P1431 on Ford vehicles means the powertrain control module (PCM) has disabled the misfire monitor because it cannot learn the trigger wheel profile for the crankshaft position sensor. The PCM needs a clean, consistent signal from the crank trigger wheel to distinguish true misfires from normal variations in crankshaft speed, and when that learning process fails, the misfire monitor is turned off to prevent false misfire codes.

SystemPowertrain
Code typeFord specific
SeverityMedium
Fix difficultyProfessional
AreaAuxiliary emission controls

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

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