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DTC P0401: EGR System
- If DTC P0401 is set, check for a clogged or leaking EGR line and a faulty EGR valve. Repair or replace components as necessary. If no problems are found, go to next step.
- Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING CODES
. Install SCS Service Check Connector Tool (07PAZ-0010100
). See Figure
. Test-drive vehicle with no electrical load, with A/T in D4 position. Decelerate gradually from 55 MPH for at least 5 seconds. If DTC P0401 resets, go to next step. If DTC P0401 does not reset, problem is intermittent, system is okay at this time.
- Clean intake manifold EGR port and EGR passage with carburetor cleaner. Clean passage inside EGR valve with carburetor cleaner, or replace EGR valve as necessary.