P1406 ISUZU – EGR Valve Pintle Position Circuit

P1406 ISUZU Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1406 ISUZU Possible Causes

Faulty Exhaust Gas Recirculation (EGR) valve,Carbon blockage of the pintle

P1406 ISUZU Description

The Powertrain Control Module (PCM) determines that the EGR valve is stuck open if the actual Exhaust Gas Recirculation (EGR) position and the learned closed EGR position vary by more than a predetermined value. The PCM tests for a stuck valve when the desired EGR position is at 0%. The PCM commands the EGR valve to 100% during certain driving conditions in order to clear a possible restriction from the EGR valve if the PCM determines that the valve is stuck open.