Ask the Car People.SM


2003 GMC HD 6.0 - Computer settings improve mileage

13 messages,  Last post on Dec 04, 2011 at 7:52 AM

You are in the Chevrolet Silverado & GMC Sierra Forum.

What is this discussion about? GMC Sierra 1500HD, Fuel Efficiency (MPG), Truck

Messages Page 2 of 2

#6 of 13 2003 gmc sierra 1500hd slt crew cab by kylegmc2003

May 04, 2010 (5:13 pm)

Engine codes that I was told about was to replace my "throttle body module" computer part mechanic said. I am looking for a better answer either replace the throttle body itself or the mass air flow sensor. My truck is hesitant and I have to really hit the gas to get it going. It is def. not the same power from when I first bought it. Also everytime I start the damn thing it always goes into 4 low and its tough to get out of it sometimes. I have a new alternator, battery, o2 sensors, plugs and wires. Anymore suggestions so I can stop with this money pit??

#7 of 13 Re: 2003 gmc sierra 1500hd slt crew cab [kylegmc2003] by obyone

May 05, 2010 (1:07 am)

Replying to: kylegmc2003 (May 04, 2010 5:13 pm)
The hit the gas part reminds me of those Chevies that used to have a binding throttle body due to carbon buildup on the linkage or the throttle plate. Try check to see if either has a buildup or if the throttle plate linkage is bent.

#8 of 13 bad mpg with my 2006 gmc by chuck2006

Jun 30, 2010 (6:17 pm)

anybody have some ideas how i can get better mpg with my 2006 gmc 4x4 truck with a 5.3 gas engine. my truck has 39000 miles and gets 12 mpg

#9 of 13 1500 hd won't start the first time by 49faithfull

Aug 25, 2010 (9:02 pm)

How's it going everyone?
 
I need some help with a problem I have had for a few months now. I have a 2003 GMC Sierra 1500hd 6.0L pick up with 86,000 miles and it will not start the first turn over. If I then proceed to try again it will start either the second or the third time. If I have driven it recently it usually starts up the first time. I replaced the fuel pressure regulator and that did not help the problem. I noticed if I turn the key from the on and off position quickly 5 or so times, it starts right away. It seems I am not getting the fuel into the motor right away, is this the fuel pump? Fuel filter?
 
Any help would be appreciated.
 
Thanks.

#10 of 13 2010 1500 slt Z71 4x4 5.3 engine by 2010pickup53

Oct 31, 2010 (10:40 pm)

I have a 2010 GMC Sierra Crew Cab 1500 pickup with a 6 speed transmission. The transmission has selections for Park, Reverse, Neutral, Drive and (M) M allows you to select from all 6 speeds. 6, 5, 4, 3, 2, & 1. You can use Drive only or move the gearshift into (M) that should first go to 6th gear at top so the transmission does not tear itself apart by dropping down into a much lower gear such as Low (1). Well my problem is when I select (M) it first shifts down into Low (1) which could destroy the tranny and who knows what else. Has anyone who owns the 2010 (or other years) GMC Sierra 1500 pickup had this happen?
 
Help me please. CAH
Read more: http://forums.motortrend.com/70/8435044/pickups-suvs/2010-gmc-sierra-1500-pickup- /index.html#ixzz1401Tkoaw

#11 of 13 Re: 1500 hd won't start the first time [49faithfull] by jbrundige

Jan 18, 2011 (11:36 am)

Replying to: 49faithfull (Aug 25, 2010 9:02 pm)
I just bought a 2003 from a dealer in Sept. had the same issue going right out of the dealership... they made it right... twice... fuel filter and fuel pump in the tank was also replaced... it worked until I ran out of gas at 1am in Iowa on I 80.... then they took the tank off again and fixed the wiring of the fuel pump for me..... so far no charge and this was done in November when I came back with an extra 4,000 miles on it.... they are still working with me with fuel gauge.... still got troubles.... So what I'm saying is the computer is not seeing fuel coming so the fuel pump must be clogged>>>>>> that is what I'm saying...
Jill

#12 of 13 Re: 1500 hd won't start the first time [49faithfull] by jaime76

Feb 26, 2011 (1:02 pm)

Replying to: 49faithfull (Aug 25, 2010 9:02 pm)
I had same issue with my 01 silverado I replaced the fuel pump. right now I have same issue with my 01 1500 hd about to change fuel pump. hope thi s helps.

#13 of 13 RFA 1 Low Battery by threadguy

Dec 04, 2011 (7:52 am)

I've been driving an '03 GMC Sierra 1500HD, 6.0L since 2006, bought it used w/ 45K mi. and have had NO problems w/ it other than normal maintenance. The speedometer is gone but the odometer's still rolling, just turned 129K. The message center is indicating "RFA 1 low battery". I've searched only on-line and can't find what this means. The battery was replaced a month ago. Everything is running fine...for now. I had an issue w/ the oil pressure gauge this weekend. The needle was all the way to the right. It's working fine now, all fluids are fine too. Just curious if I'm headed for any surprises. Just want peace of mind, this is my one and only vehicle other than my wife's street legal golf cart! Is there anyone that can coach me on whether or not I have any potential issues?

Messages Page 2 of 2

To POST a message, please Sign In.

Advertisement

Browse by Category

Browse by Vehicle
   View All Vehicles

Browse by Board
Browse by Topic
View All Topics

Edmunds Community

Advertisement