What does code P1408 mean?

Q: What does code P1408 mean?

EGR Flow Out of Self-Test Range. P1408 on a Ford means the powertrain control module (PCM) commanded the exhaust gas recirculation (EGR) valve to open during a self-test and the resulting change in manifold pressure or EGR flow did not fall within the expected range. The PCM is not reporting a completely dead circuit; it is reporting that the measured flow response was outside the calibrated window for the test conditions.

DTC codes / Ford codes / P1408

P1408 · FordEGR Flow Out of Self-Test Range

P1408 on a Ford means the powertrain control module (PCM) commanded the exhaust gas recirculation (EGR) valve to open during a self-test and the resulting change in manifold pressure or EGR flow did not fall within the expected range. The PCM is not reporting a completely dead circuit; it is reporting that the measured flow response was outside the calibrated window for the test conditions.

SystemPowertrain

Code typeFord specific

SeverityMedium

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.