I have an 03 gmc 2500hd dura, alison ect 113k miles. I pluged my tech 2 into it and got codes p0181: (Fuel temp Sensor) p1094: (Fuel rail pressure low during idle or decel fuel cut-off). Is this any sign of things to come?

Also latly the truck at idle seems to rev up and down maybe 100rpms every few seconds.

This truck has been my baby sence 2002 and has never had any engine work done to it. Thanks so much for any help.

The temp sensor code I'm not sure on, but the idle surge is probably the fuel pressure regulator on the back of the cp3 pump.
Good luck, weblee99

Sorry im a diesel retard, what does cp3 stand for?

its the high pressure fuel pump used on the common rail system. they are none to stick which causes a surging idle and a very common occurrence. ive found that a quart of 2 stroke oil in about a 1/4 tank of fuel will free it up but it will eventually come back.

x2 on the regulator. Also have heard that the 2 stroke oil works to

OK thanks.

OK thanks.

Next time you fill up put a quart of 2 cycle in and 2 bottles of SeaFoam.