Fuel Pressure Signal Too High Engine System Service Urgent

[dude99]

Hi folks,
So I bought a 2007 XC70 a week and a half ago and its been nothing but troubles. Haldex died on day 3 ( dealer I baught it from is replacing that for me) however on my drive to work yesterday I got the "Engine System Service Urgent" message up on the dash. It wasn't running right and you could feel it hesitating and occasionally bucking under acceleration. I had noticed the day prior that under hard acceleration it wasn't smooth and seemed to stumble a bit.

So I babied it to a friends house about half way home and plugged in his generic scan tool. It put up a code P0088 Fuel pressure too high. Odd I thought, but it should get me home. So I proceeded to baby it the rest of the way home (an 1.5hr drive seemed so much longer).

When I got home I plugged in my higher level scan tool I got code 290C Fuel pressure, 291C (which seems to be the car turning on the dash waring, and code 6200 (cooling fan control module).

Went out this morning and hooked up my fuel guage and scan tool to check the fuel pressure and sensor. RIght away I noticed that the scan tool was reporting a value (60PSI? I think) when the car was off with key on, however there was no pressure on the guage. Odd I thought.. Do these cars not prime the system when the key is turned on? When I started the car the pressure jumped up on the gauge and settled to 40psi, the scan tool reporting 58psi. Which with the difference in relative vs absolute pressure I think is correct?

Now, I'm not too familiar with the fuel systems on these cars however I did notice that when I increased the engine RPM's the pump duty cycle increased, which makes sense. Also the pressure held rock steady the entire time it was running and did not budge with any change in RPM. This to me would indicate the PEM is working correctly?

So I'm at a bit of a loss here.... any thoughts?

[darylrobert]

Take is back to the dealer and get them to fix it

i think that car has a pressure sensor on the rail?. i think if the computer thinks the pressure is too high is would cut fuel. Are you checking the fuel at the rail with a gauge and it says 40PSI when running and zero after some 20minutes from memory.

The PEM ,ounted above the tank have a high failure rate