Code P0088– No running issues

[907cummins]

Hi all, I recently purchased a 2006 5.9 Cummins w/ 114,000 miles. The previous owner had a long list of maintenance completed in the past two years— mostly reliability related.

Two times now I have gotten DTC P0088 “Fuel Rail Pressure Signal Is Above Max Limit”. When this happens the truck runs completely fine as far as I can tell and drive ability is not affected. No rough idle, doesn’t accelerate any different, etc. I cleared the code on the MM3 both times after running some pulls through all gears.

I have searched this forum a bunch and I can’t find the answer to a couple questions:

1. Truck is tuned by a professional tuner (don’t know who). Could the tune be causing this problem?

2. Can the FCA, Fuel Pressure Sensor, or Pressure Relief Valve all slowly fail? Hence the random CEL once cleared.

Any help is appreciated!

 

[Ozymandias]

Check if you really still have PRV - or just a plug.

https://www.google.com/search?q=prv plug cummins&ie=utf-8&oe=utf-8&client=firefox-b-1-m

 

[907cummins]

Check if you really still have PRV - or just a plug.

Is this a common thing that is done to these engines?

 

[Ozymandias]

Yeah, some think it's a smart move to take that out to run higher rail pressures...

Redneck tuning I call this.

https://www.google.com/search?q=prv plug cummins&ie=utf-8&oe=utf-8&client=firefox-b-1-m

 

[907cummins]

Yeah, some think it's a smart move to take that out to run higher rail pressures...

Redneck tuning I call this.

https://www.google.com/search?q=prv plug cummins&ie=utf-8&oe=utf-8&client=firefox-b-1-m

The PRV is still there.

 

[Ozymandias]

The plug looks the same, you have to take it out and inspect.

https://www.dieselbombers.com/dodge-diesel-tech-articles/14573-capping-fuel-rail.html

 

[907cummins]

The plug looks the same, you have to take it out and inspect.

https://www.dieselbombers.com/dodge-diesel-tech-articles/14573-capping-fuel-rail.html

Truck has not thrown that code again. Did it twice in a matter of two days and now no more. I'm wondering if there was maybe a small fuel contamination-- hopefully not. Thanks for the help. If it happens again I will pull the PRV and see if it was plugged. I don't think it is based on the past owner.