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Ask GM Tech (Cam) Your Own Question

GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 27644
Experience:  GM Grand Master Technician 2007. 11 years experience.
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I have a 06 gmc duramax that throws a low fuel rail pressure

Resolved Question:

I have a 06 gmc duramax that throws a low fuel rail pressure code when under a load. No not a filter prob. does this truck have an actual lift pump if so can i test it myself? i keep hearing horror stories about dealer incompetence.
Submitted: 2 years ago.
Category: GM
Expert:  GM Tech (Cam) replied 2 years ago.

GM Tech (Cam) :

Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.

GM Tech (Cam) :

NO, this does not have a lift pump.

GM Tech (Cam) :

THe injection pump pulls the fuel out of the tank.

GM Tech (Cam) :

There is a common issue with these engines. It is the fuel pressure relief valve. This valve is a small plug in the end of the drivers side fuel rail. When they get hot, the start to open a bit too soon and set this code. There is a cheap solution to this. A shim that will hold the pressure back. Here is a website that sells these shims. http://dmaxstore.com/index.php?main_page=product_info&products_id=93

Expert:  GM Tech (Cam) replied 2 years ago.
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Expert:  GM Tech (Cam) replied 2 years ago.

NO, this does not have a lift pump.


THe injection pump pulls the fuel out of the tank.


There is a common issue with these engines. It is the fuel pressure relief valve. This valve is a small plug in the end of the drivers side fuel rail. When they get hot, the start to open a bit too soon and set this code. There is a cheap solution to this. A shim that will hold the pressure back. Here is a website that sells these shims. http://dmaxstore.com/index.php?main_page=product_info&products_id=93

Customer: replied 2 years ago.
when the truck is under a load and you ask it for more power that is when they send this code. also i do have a tuner in this truck and if i have it turn up then it will throw this code with out a load but under hard acceleration. also the problem has gradually gotten worse over the course of the last six months. is this pressure relief valve shim an installation that is possible for someone with competent mechanical abilities without the use of expensive specialty tools. the truck has 138,000 miles on it.
Expert:  GM Tech (Cam) replied 2 years ago.
The shim is very easy to install and for the whole $15 it is, is well worth the time to try. It comes with directions but it goes into the end of the drivers side fuel rail.
Customer: replied 2 years ago.
I have been under the impression that the LB7 did not have a lift pump but the LBZ did? Is this accurate? My pickup is the 06 with the 350 factory horsepower engine NOT the 300 horsepower engine I believe it to be the LBZ is this correct? the vin for this truck is 1GTHK23D56F229268 if this is helpful in giving me any more diagnostic info. The code that it throws is P0087 I think. If the shim kit does not fix the problem what would your reccomendation be for further steps?
Expert:  GM Tech (Cam) replied 2 years ago.
None with the exception of the LLY in the vans have a lift pump.
YEs the D is the LBZ with 360 hp.
You shoud put the shim and and see. If not that then we may be looking at injectors or the injection pump.
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 27644
Experience: GM Grand Master Technician 2007. 11 years experience.
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