duramax problem

[sdc05gmc2500hd]

So i was driving down the high going about 85ish. And the check engine light come on and just fell on its face. With it to the floor only 2200 rpms and really spurty. No smoke at all. And nothing done to the truck all stock. Any ideas whats wrong with her? 05 GMC 2500 with an lly

 

[Josh2002cc]

Codes? What we do know is your truck went into limp mode and will not go over 2000(ish) RPM's. Codes may help us tell you "why".

 

[sdc05gmc2500hd]

No codes yet on its way to the place i bought it. now that it has cooled off while waiting for the tow truck the check engine has turned off

 

[02ilduramax]

Did u check the fuel filter?..we had a truck truck at work to the same thing

 

[sdc05gmc2500hd]

The place i bougt it said they did an oil change and a fuel filter when i bought it and the fuel filter % says 85%

 

[02ilduramax]

Not saying they didn't but it wouldn't hurt to change it and know for sure

 

[sdc05gmc2500hd]

Fact!!! Ill be doing that when i get it back thanks for the advice

 

[02ilduramax]

:thumb:

 

[TeaBagger2006]

Check your harness near the alternator for any damaged wires, lly's are notorious for that problem

 

[duramax05blk]

Also could be low rail pressure my 05 was notorious for that Ppe shim kit or race valve. Limp mode will still let the truck go over 2k.


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[sdc05gmc2500hd]

Would i get low rail pressure stock

 

[duramax05blk]

Ya the valve in fuel rail sticks mine did it stock and with banks had to shim it now have max effort efi tune and it's fine


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[duramax05blk]

I believe its p1093 code


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[sdc05gmc2500hd]

problem found

It was fuel rail pressure low. How do i fit it just a tuner shim kit any other ideas

 

[JoshH]

You need to figure out why it is happening. I don't see a FPRV pop open just cruising very often; it mostly happens because of a fuel pressure spike caused by going from a high load situation to a low or no load situation (such as accelerating around someone to pass and then letting off). It would be best if you could hook up a scan tool of some sort and watch what the rail pressure is doing and/or do a bottle test (search bottle test to find out how to do that).

 

[sdc05gmc2500hd]

Ok thanks for the advice

 

[duramax05blk]

Driving 85 on stock tune I'd say he was tippin into it a little bit


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