Originally Posted by nostep
So, is there any other sensor than the EGR valve? Mine is sending a P0404. Do I still need to replace the EGR Valve?
2007 JK, 54,000 Miles.
Here is some info for the code you have.
There are a few things to check first, but is has usually been a new EGR valve that fixes it.
P0404-EGR POSITION SENSOR RATIONALITY OPEN
Theory of Operation
The EGR valve has a position sensor and the EGR position rationality is designed to make sure that the valve moves freely within its operating range. Closed valve position reference check verifies that the valve is within its allowable upper and lower limits. The EGR position rationality test looks for a sustained error relative to commanded valve position.
The EGR flow or valve movement is not what is expected. A rationality error has been detected for the EGR Close Position Performance. Two trip fault.
EXCESSIVE RESISTANCE IN THE EGR SENSOR SIGNAL CIRCUIT
EXCESSIVE RESISTANCE IN THE 5 VOLT SUPPLY CIRCUIT
EXCESSIVE RESISTANCE IN THE EGR SOLENOID CONTROL CIRCUIT
SENSOR GROUND CIRCUIT OPEN
EGR SOLENOID GROUND CIRCUIT OPEN
EGR SOLENOID ASSEMBLY
POWERTRAIN CONTROL MODULE (PCM)