For Shop Owners

P0401 HONDA - Exhaust Gas Recirculation Insufficient Flow

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3 What does this mean?

Possible causes

  • Exhaust Gas Recirculation Valve harness is open or shorted
  • Exhaust Gas Recirculation Valve circuit poor electrical connection
  • Faulty Exhaust Gas Recirculation Valve
  • Exhaust Gas Recirculation Valve clogged
  • Exhaust gas leaks
What does this mean?

Tech notes

In some 1999–2003 Honda Odysseys and 2003 Honda Pilots, the EGR system may become contaminated or clogged. If this happens, the vehicle may hesitate or surge during light acceleration, and the MIL (malfunction indicator lamp) may come on with DTC P0401 (EGR insufficient flow) or P1491 (EGR valve insufficient lift). If DTC P0401 or P1491 is stored, or if the engine hesitate or surges, clean the EGR port, install an EGR pipe kit, and clear the code.

The problem is also common on most 1998-2001 Honda Accord. The factory released a bulletin with instruction on how to clean the intake system.
1998-2001 Honda Accord EGR Port Clogging OBDII Code P0401

P0401, 1999 Acura TL Honda V6

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What does this mean?
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Posted and Edit by 06-14-2015