EGR Monitor and Readiness Code
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2025 Honda Odyssey, 2024 Honda Odyssey, 2023 Honda Odyssey, 2022 Honda Odyssey, and 2021 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- During the procedure, do not turn the vehicle to the ACCESSORY mode or the OFF (LOCK) mode.
- All readiness codes are cleared when the 12 volt battery is disconnected, if DTCs have been cleared, or if the PCM is reset with the HDS.
Enable Criteria
ECT SENSOR 1 at 176°F (80°C) or more.
Procedure
2. Start the engine.
3. Drive at a steady speed with the transmission in D at 50-62 mph (80-100 km/h) or above for more than 10 seconds.
4. With the transmission in D, decelerate from 62 mph (100 km/h) or above by completely releasing the throttle for at least 5 seconds. If the engine is stopped during this step, repeat steps 3 and 4.Check the OBD status screen for DTC P0401 in the DTC's MENU with the HDS.
- If it is passed, the readiness code is complete.
- If it is not passed, go to step 3 and retest.