DTC P0400: EGR System Leak Detected

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Check for a loose or damaged EGR pipe.
Is the EGR pipe OK?

YES -Go to next step.

NO -Reconnect or replace the EGR pipe, then go to step 7.
Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C)
- Transmission in D
- Vehicle speed at 25 mph (40 km/h) for 5 minutes or more
- Maintain the vehicle speed at 32 mph (50 km/h) for 5 minutes or more with cruise control set
Monitor the OBD STATUS for DTC P0400 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?

YES -Go to next step.

NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for leakage between the EGR pipe and the EGR valve. If the HDS indicates NOT COMPLETED, go to step 3 and recheck.
Turn the ignition switch to LOCK (0).
Replace the EGR valve (see EGR VALVE REPLACEMENT ).
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
Test-drive under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C)
- Transmission in D
- Vehicle speed at 25 mph (40 km/h) for 5 minutes or more
- Maintain the vehicle speed at 32 mph (50 km/h) for 5 minutes or more with cruise control set
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0400 indicated?

YES -Check for leakage between the EGR pipe and the EGR valve, then go to step 1.

NO -Go to next step.
Monitor the OBD STATUS for DTC P0400 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?

YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 11, go to the indicated DTC's troubleshooting.

NO -If the HDS indicates FAILED, check for leakage between the EGR pipe and the EGR valve, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 10.