Question about 2008 Ford F 450 Super Duty

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I have a 2008 f-450 with 6.4 diesel my problem is on ocassion it will go into limp mode and the engine code is P0088 high fuel rail presurre do you know if that would be the High pressure fuel pump or could you suggest something else.

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This code is saying the fuel preasure is too high, this may be caused by a stuck fuel preasure control valve or a bad fuel rail preasure sensor, you would need to first check the valve to make sure its not stuck then test the preasure sensor, to test sensor a scan tool would be very helpful. hope this helps.

Posted on Sep 28, 2010

  • michael Sep 10, 2013

    where would the pressure sensor an control valve be located

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Circuit/System Description
The fuel injection pump supplies high pressure fuel to the fuel injection rails, and then to the fuel injectors through high pressure pipes. The fuel rail pressure (FRP) sensor is a three wire sensor mounted in the right fuel injection rail. The FRP sensor uses a 5-volt reference circuit , a signal circuit, and a low reference circuit to monitor fuel rail pressure. This information is sent to the engine control module (ECM) to assist in the fueling of the engine.

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