DTC P1406: EGR Pintle Position Error: Description

Exhaust Gas Recirculation (EGR) valve consists of a pintle valve that moves by use of an internal solenoid and an internal position sensor (potentiometer) which is used to determine pintle valve position. EGR solenoid receives power through main relay when ignition switch is in CRANK or RUN position. ECM controls EGR solenoid by supplying a ground to EGR solenoid whenever exhaust gas needs to be recirculated into intake manifold. EGR sensor signal voltage operating range is .14-4.82 volts. ECM monitors EGR solenoid control feedback and EGR senor signal (valve position) circuits for correct voltage levels at certain times. DTC sets when actual EGR sensor signal position differs from ECM desired sensor position more than a calibrated value for a certain length of time.