Po088 code?? - Ford Powerstroke Diesel Forum
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Old 05-29-2012, 08:51 PM
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Po088 code??

Just bought my first powerstroke, its a 08 model. Drove fine for the first 100 miles then I got the fuel rail pressure to high code. Turned the light off and it ran good for about another 50 miles and came back on and goes into a limp mode. What all should be looked at on these trucks or is it definately the hpfp? Thanks any info would help me in the right direction.
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Old 05-29-2012, 11:33 PM
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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.
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Old 06-05-2012, 04:28 PM
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Fuel rail pressure too high isn't going to be caused by much more than a sticking PCV in the hpfp. It could still be the FRP sensor or harness but that is more unlikely. Atleast they have acknowledged the sticking valves in these pumps..... before there was any kind of better service info we were chasing our tails trying to figure these things out. More often than not it is the pump
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