CAR OBD CODES
OBD/DTC Search, e.g.P0400
CAR OBD CODES P0400
P0400 OBD Code Definition:
P0400 Exhaust Gas Recirculation Flow
P0400 OBD Code Description:
OBD2 Code P0400 Definition:
The exhaust gas recirculation (EGR) valve is vacuum controlled valve that regulates the amount of exhaust gases that re-enter the cylinders. The powertrain control module (PCM) determines how much based on engine load, temp, and other conditions. If the PCM detects that the amount of exhaust gases entering the cylinder were insufficient or non-existent, this code is set.
Symptoms
Possible sumptoms of P0400
No symptoms will likely be noticed by the driver other than the MIL (malfunction indicator lamp). However, non visible symptoms will be increased combustion temperature and increased Nox emissions. Sometimes you may notice a flat spot, or the vehicle may enter limp mode or show a EML light.
Possible Causes
Possible causes of P0400
A code P0400 may mean that one or more of the following has happened: Plugged EGR passage which restricts the flow of exhaust gasses Faulty EGR solenoid Faulty EGR solenoid wiring/harness Vacuum lines damaged/disconnected to the EGR valve solenoid or to the EGR valve Faulty EGR valve
Possible Solutions
Since EGR valve designs are different, no one test will suffice: Using a scan tool, operate the EGR valve with the engine running. If the engine stumbles, the problem was likely intermittent wiring problem or intermittent blockage problem If engine doesn’t stumble, operate the EGR valve manually, if possible. If engine doesn’t stumble and die, the ports are likely plugged. Removal of valve and cleaning of all ports will be required Checking of solenoid can only usually be done with a scan tool, because most solenoids operate with a duty cycle of voltage, rather than constant voltage Check all vacuum lines, hoses, etc for any damage Visually inspect the solenoid harness and the solenoid for damage Replace EGR valve OBD-II Codes
P0401 P0402 P0403
Note: The information on the P0400 error code is purely informative, if you need more useful information, please consult your technician.
B299D B1392 B2060 B1682 B2665 B2650 B2ADF B1494 B1481 B2214 B2919 B2996 B2832 B1764 B1433 OBDII Chassis Codes
C1100 C1899 C1221 C100B C1870 C1A84 C1820 C0215 C1502 C1705 C1500 C1891 C1713 C1519 C1480 OBDII Network Codes
U025B U1076 U201C U025A U017E U1219 U047E U0085 U1247 U1168 U0318 U0189 U059D U1108 U1124 OBDII Powertrain Codes
P0244 P2308 P2460 P2032 P1594 P0098 P0800 P1485 P1620 P1303 P0037 P051E P228D P2830 P1798