Some F-Super Duty F-250/350/450 trucks equipped with a 6.7L diesel engine and built on or before 5/16/2012 may experience an engine shudder with or without turbo flutter noise around 900-1,400 rpm with steady throttle.
The issue may be more noticeable at high elevation, high ambient temperature and/or when driving up a slight incline. The concern is not present during regeneration or while using cruise control. Some vehicles that exhibit the concern may set DTC P0299.
Step 1: Check all continuous memory DTCs. Are any DTCs present other than P0299? If yes, this bulletin does not apply. Refer to powertrain control/emissions diagnostics. And continue with normal diagnostics. If no, proceed to Step 2.
Step 2: Reprogram the PCM to the latest calibration using IDS release 83.01 or higher.
Some light surge (engine lugging) may still be present under certain engine load and driving conditions after PCM recalibration due to customer driving habits and increased throttle input may be required.