Possible causes

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

Tech notes

The P1406 code means that the EGR valve is 10% of the expected position by the Powertrain Control Module (PCM), usually caused by carbon built up n the EGR valve. Start by cleaning the EGR valve.

When is the code detected?

The EGR pintle position was