And this is the flash code. 11B23
11B23 has been out for a while. My truck had 11B23 and still had a bad HPFP.
Ford acknowledged some HPFP pumps were defective. An upgraded pump was released (updated HPFP changed p/n from rev A to rev B)
Here is TSB
TSB 11-4-22 6.4L - LACKS POWER - DTC P0088
Publication Date: April 27, 2011
FORD: 2008-2010 F-250, F-350, F-450, F-550
This article supersedes TSB 11-4-15 to update the Service Labor Time Standards.
Some F-Super Duty 250-550 vehicles equipped with a 6.4L diesel engine may exhibit a lack of power concern with an intermittent diagnostic trouble code (DTC) P0088; at full operating temperature during moderate to heavy acceleration.
Follow the Service Procedure steps to correct the condition.
Intermittent P0088 diagnostics:
Check all continues memory DTCs. Is DTC P0088 the only code present?
No - do not continue with this procedure. Refer to the Powertrain Control/Emission Diagnostics (PC/ED) to diagnose this concern.
Yes - continue to Step 2
Replace the high pressure pump (HPP). Refer to Workshop Manual (WSM), Section 303-04C for HPP replacement.
Both the fuel volume control valve (VCV) and fuel pressure control valve (PCV) adaptive learning parameters must be reset after a HPP replacement. Refer to PC/ED, Section 4, Hard Start/No Start Diagnostic Subroutines step 7 to reset adaptive tables.
PART NUMBER PART NAME
8C3Z-9A543-B High Pressure Fuel Pump
OTHER APPLICABLE ARTICLES:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
OPERATION DESCRIPTION TIME
110422A 2008-2010 F-Super Duty 6.4L Regular Cab: Check DTCs And Replace the HPP Includes Time For Prior Approval, Remove And Install Cab, And Reset Both VCV And PCV Adaptive Learning