Diagnostic Trouble Codes (DTCs) related to the Exhaust Gas Recirculation (EGR) system can vary by vehicle manufacturer and model. The following is a general list of DTCs related to the EGR system that may be stored in the engine control unit (ECU):
P0400: Malfunction of the exhaust gas recirculation system
P0401: Insufficient EGR flow detected
P0402: Excessive EGR flow detected
P0403: EGR solenoid control circuit
P0404: EGR control circuit range/functioning
P0405: EGR position sensor A circuit low
P0406: EGR position sensor A circuit high
P0407: EGR position sensor B circuit low
P0408: EGR position sensor B circuit high
P0409: EGR feedback sensor A circuit
In addition to these codes, here are some specific codes from major manufacturers:
Ford:
P1335: EGR Position Sensor Minimum Stop Performance
P1405: DPFE Sensor Upstream Hose Off or Plugged
GM (Chevrolet, GMC, Cadillac, Buick):
P1404: EGR Closed Position Performance
P1406: EGR Valve Pintle Position Circuit
Volkswagen/Audi:
17887: EGR System: Regulation Deviation
17849: EGR Valve (N18): Open Circuit
BMW:
3C31: EGR System Control Deviation
3C32: EGR Cooler Bypass Valve Control Deviation
Mercedes-Benz:
P2359: Boost pressure control – Maximum charge pressure exceeded
P2004: Component N15/3 (EGR positioner) is faulty
Honda:
P1491: EGR Valve Insufficient Lift
P1498: EGR Valve High Voltage
Toyota:
P0401: EGR Flow Insufficient Detected (EGR System)
P1401: EGR Temperature Sensor Circuit
Nissan:
P1490: Vacuum Cut Valve Bypass Valve (Circuit)
P1492: EGR Function (Open)
Remember that while this list includes some specific codes from the manufacturers listed, there may be more DTCs related to the EGR system depending on the model and year of the vehicle. For a complete and accurate list of DTCs for your specific vehicle, please refer to the manufacturer’s service manual or use a diagnostic scanner compatible with your vehicle.
