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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

#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

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