CAR OBD CODES
OBD/DTC Search, e.g.P0404
CAR OBD CODES P0404
P0404 OBD Code Definition:
P0404 Exhaust Gas Recirculation Control Circuit Range/Performance
P0404 OBD Code Description:
OBD2 Code P0404 Definition:
The EGR (Exhaust Gas Recirculation) system’s purpose is to redirect exhaust gas back into the cylinders. Since exhaust gas is inert, it displaces oxygen and fuel, thereby lowering cylinder temps, which, in turn, lowers oxides of nitrogen emissions. For that reason it needs to be carefully metered into the cylinders (via the EGR valve) so as not to adversely affect the engine’s performance. (Too much EGR and the engine won’t idle). If you have a P0404, then the EGR valve is likely an electrically controlled EGR valve instead of a vacuum controlled EGR valve. Also, the valve will usually have a feedback system built into it that informs the PCM (Powertrain Control Module) what position the valve is in; open, closed, or somewhere in between. The PCM needs to know this to determine whether or not the valve is operating as needed. If the PCM determines that the valve should be operating, but the feedback circuit shows that the valve is not open, this code will set. Or if the PCM determines the valve should be closed but the feedback signal indicates that the valve is open, this code will set.
Symptoms
Possible sumptoms of P0404
There may be no symptoms of a P0404 DTC other than the MIL (malfunction indicator lamp) or check engine light. However, Exhaust Gas Recirculation systems are inherently problematic due to carbon buildup in the intake manifold, etc. This normal buildup can lodge in an EGR valve, holding it open when it should be closed. If this is the case, the engine may idle rough, or not at all. If the valve has failed and is NOT opening, then symptoms would be higher combustion temps and as a result, higher Nox emissions. But the latter symptoms aren’t going to be noticeable to a driver.
Possible Causes
Possible causes of P0404
Usually this code points to either carbon buildup or a bad EGR valve. However that doesn’t rule out the following: Open or short in the 5 Volt reference circuit Open or short in the ground circuit Open or short in the PCM controlled voltage circuit Bad PCM (less likely)
Possible Solutions
Using a scan tool command the EGR valve to open while watching the actual EGR position (it will probably be labeled “desired EGR” or something similar). The actual EGR position should be very close to the “desired” EGR position. If it is, then the problem is likely intermittent. It may have been a lodged piece of carbon that has since dislodged, or it could be a bad EGR valve winding that intermittently opens or shorts as the valve temperature changes. If the EGR “desired” position is not close to the “actual” position, then unplug the EGR sensor. Check for a good 5 Volt reference voltage to the connector. If it doesn’t show a reference voltage, repair an open or short in the 5 Volt reference circuit. If there is a 5 volt reference voltage, activate the EGR with the scanner, monitor the EGR ground circuit with a DVOM (Digital Volt/Ohm meter). It should indicate a good ground. If it doesn’t then repair the ground circuit. If there is a good ground, then check the control circuit. It should indicate voltage that varies according to the percentage that the EGR is open. As it’s open more, the voltage should increase accordingly. If it does, then replace the EGR valve. If the voltage doesn’t increase incrementally, then repair open or short in EGR control circuit. OBD-II Codes
p-400 p0401 p0402 p0403
Note: The information on the P0404 error code is purely informative, if you need more useful information, please consult your technician.
B115F B2993 B299E B2AD4 B1516 B1840 B2206 B10FC B194B B12AD B2852 B3172 B1251 B0951 B1057 OBDII Chassis Codes
C1B18 C1A04 C1113 C0078 C1258 C1886 C1872 C0324 C1251 C1111 C1114 C1336 C1093 C1400 C1460 OBDII Network Codes
U2602 U0536 U0035 U0480 U1113 U0261 U0156 U2029 U0114 U0491 U0061 U0252 U0209 U0110 U1079 OBDII Powertrain Codes
P267B P2624 P0BDB P2857 P2765 P1210 P0B7F P258C P2086 P0096 P226B P2177 P0192 P0C5B P081B