I have a 2001 silverado that will go in to limp mode if I drive it pretty hard.
I first replaced the fuel filter and I thought it help... but no it did it again. On the thought that I may have gotten bad fuel I replaced the filter again. Nope still didn't work. So local dealer says first thing to do is change the fule and air filters (both can cause the limp mode) so I replaced the air filter Nope didn't work either.
I have researched this issue and I see several people have had the same problem. So, what gives
Where should I go from here? To the stealership?
Or is there other simple things that I can try?
I pulled the code and it was p0093
I run a Hypertech but it will do it with or without the programmer installed.
So what do I do next? Thanks for the help

Make a sig for yourself so we can see exactly what you have,

My truck did the same thing last week and keep getting easier to set the code. This week it got new injectors because one died and filled the crank case with fuel.

I have a 2001 silverado that will go in to limp mode if I drive it pretty hard.
I first replaced the fuel filter and I thought it help... but no it did it again. On the thought that I may have gotten bad fuel I replaced the filter again. Nope still didn't work. So local dealer says first thing to do is change the fule and air filters (both can cause the limp mode) so I replaced the air filter Nope didn't work either.
I have researched this issue and I see several people have had the same problem. So, what gives
Where should I go from here? To the stealership?
Or is there other simple things that I can try?
I pulled the code and it was p0093
I run a Hypertech but it will do it with or without the programmer installed.
So what do I do next? Thanks for the help You may be limping your tranny.

p0093 is large fuel leak . my truck did the same thing and had a hard time fixing it . it ended up being the fuel pump. the dealer tech can check your truck and tell what it is. mine would call for a certain amount of fuel pressure but when the pump would not deliver it would set a p0093 code.

Thanks for all the input. I read on here that someone had a problem with the rubber lines leading to the FICM? Does anyone know anything about that? I checked mine last night and they do seem to be weak. Especially the one going IN to the fuel filter assembly. Can anyone tell me which of these two lines would fuel be pushed thru and which one would be pulled?
I guess the one that is being pulled would be the one to suck together. Or is that incorrect? Thanks for all the help.

Also, I have read on here that some people say they have a fuel pump and some say they do not have a fuel pump? Can you give some info on that? And if so is it in the tank?

LB7 rarely throw p0093's

You have changed the obvious,fuel filter.

Look for a weak rail sensor,FRPCV or injector balance rate out of spec.If you haven't had any of the three things changed,all bugs with the 01's,then that is the problem.All easy diagnosed with a tech II.

If your not over the 100K mark then every thing should be covered.Injectors to 200 K.

Good luck.

I ordered new lines today. it is going to be around $15 for both so I thought it was woth a shot...
It will be Monday before they are here so I will post then to let you know if that corrects the problem........

Thanks again

i put new rail sensore and injectors on mine and it did not fix it.only the fuel pump( pressure pump) which is on the motor is the culprit. put a tech 2 on it . it cost me about $250.00 for diagnose.well worth it !

Did you have any other symptoms with your bad pump?
how much did the new pump cost?

thanks
danb

the only simptoms i had was when i pulled anything with any wieght it would p0093. the heavier the faster it limped. hot weaTHER also made it limp faster.
the new pump cost me about $800 with the gascets.a friend of mine is a teck at the gm dealer so he put it on at his house for $200.
runs great now. put a edge on since the pump change and it will roll on.

OK, I put the fuel hoses on last night and that did not fix the problem. It looks like I am off to the strealership.

Strange thing though, I called 2 different dealers and neither could find a fuel rail pressure sensor in the computers? Any ideas??????

thanks
dannyb

the pressure sensore is in the drivers side fuel rail. it cannot be replaced independently but only as the complete fuel rail.(pretty expensive).

[quote=danb303;1008758 Can anyone tell me which of these two lines would fuel be pushed thru and which one would be pulled?
I guess the one that is being pulled would be the one to suck together. Or is that incorrect? Thanks for all the help.

Actually I have determined that they both are being pulled thru. they are both before the IP.
Sorry I am new to this and for everyone else that is new ... I have found out that the Duramax does not have a lift pump. the IP pulls the fuel from the tank (hence the reason you must prime the system after a filter change) into the FICM and then into the filter. So, everything before the IP is being pulled and everything after is being pushed.

the pressure sensore is in the drivers side fuel rail. it cannot be replaced independently but only as the complete fuel rail.(pretty expensive).

The pressure sensor is loacted in the middle of the valley on the "function block" which also houses the relief valve.

The LLY has the sensor on the passengers side rail and the relief in the drivers side rail.

Bad injectors, bad pump, or restricted supply can cause this code. Lift pump supply is a very good idea.

How much is the pressure sensor and do you know how hard it is to replace?
thanks
dannyb

Also do you think this could be my problem?
it throws the code much faster with the AC on.

not on my truck kennedy. and my relief valve is built into my pump.

I jsut got off the phone with the dealer and he said the tech has ordered me new injectors. I sure hope that solves the problem

i bet its the injector pump. it also fixed curry4113's truck.his is an 01 as well

Thanks for all the input. I read on here that someone had a problem with the rubber lines leading to the FICM? Does anyone know anything about that? I checked mine last night and they do seem to be weak. Especially the one going IN to the fuel filter assembly. Can anyone tell me which of these two lines would fuel be pushed thru and which one would be pulled?
I guess the one that is being pulled would be the one to suck together. Or is that incorrect? Thanks for all the help.

Also, I have read on here that some people say they have a fuel pump and some say they do not have a fuel pump? Can you give some info on that? And if so is it in the tank?

Unless you've added an aftermarket "pusher" fuel pump, they are all being "pulled" all the way to the injection pump in the front of the engine valley. The fuel line comes up on the driver's side near the firewall, goes through the FICM on the driver's side valve cover, crosses over to the FICM on the passenger side then goes to the filter head. Last stop after the filter head is forward to the inlet of the injection pump. The injection pump is the only fuel pump on a stock fuel system, but does contain two internal stages, low pressure and high pressure.

I finally took it to the dealer and it was the injectors. new injectors on GM's bill.
free was cheap enough for me!!!!!