Some 2011-2012 Ford F-Super Duty vehicles equipped with the 6.7L diesel engine may exhibit a MIL on with DTC P0401. This concern may be caused by a restricted exhaust gas recirculation (EGR) cooler core.
1. Using a scan tool, check all continuous memory DTCs. Is DTC P0401 present with no other EGR system related codes?
a. No: This bulletin does not apply. Refer to the Powertrain Control/Emissions Diagnosis manual to diagnose the concern.
b. Yes: Proceed to Step 2.
2. Using a scan tool, perform a key-on-engine-running (KOER) self test. Is DTC P2457 present?
a. No: This bulletin does not apply. Refer to the Powertrain Control/Emissions Diagnosis to pin-point test DTC P0401.
b. Yes: Replace the EGR cooler core. Refer to the workshop manual section 303-08.
A new EGR cooler core is available as P/N BC3Z-9V425-A. The seal kit is P/N BC3Z-9P455-A.