What does code P1404 mean?

Q: What does code P1404 mean?

IAT B Circuit Malfunction. P1404 on a Ford indicates that the powertrain control module (PCM) has detected an electrical fault in the intake air temperature (IAT) sensor circuit, specifically the portion designated as circuit B. The PCM monitors the voltage signal from the IAT sensor and flags this code when the signal falls outside the expected range or behaves erratically, preventing accurate intake air temperature readings for fuel and spark calculations.

DTC codes / Ford codes / P1404

P1404 · FordIAT B Circuit Malfunction

P1404 on a Ford indicates that the powertrain control module (PCM) has detected an electrical fault in the intake air temperature (IAT) sensor circuit, specifically the portion designated as circuit B. The PCM monitors the voltage signal from the IAT sensor and flags this code when the signal falls outside the expected range or behaves erratically, preventing accurate intake air temperature readings for fuel and spark calculations.

SystemPowertrain

Code typeFord specific

SeverityLow

Fix difficultyIntermediate

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.