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Hello,

i have a problem with my Mercedes GLK 2013 (X204) 220 CDI 4-matic 103 KW, when i drive normally and i press the gas pedal to overtake the front car, the fault engine light goes on and the car goes in limp mode.

i checked the errors and what i get is P0088FC The fuel pressure in the system is too high (attached image).

What can be the problem? Hopefully somebody can help me.

Manky thanks.
 

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W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
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Is that the only code, or are there others as well?
 

W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
Joined
1,571 Posts
Attached is some info on the fuel system and limp home mode. I don't know much about diesels, but it appears there is a pressure sensor on the fuel rail, as well as in/near the fuel filter. There is also a test port on the fuel rail that you can attach a pressure gauge on. I would do that first, as then you will know if the "too high" reading from the sensors is real or imagined.
 

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