2003 GMC Sierra 2500 HD Questions

All 2003 GMC Sierra 2500 HD Questions

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My diesel truck just had the cluster replaced now when I drive it for more then 50 miles, the check oil pressure, low oil pressure comes on and one instance, the truck actually started to down gear! Help! What could ...
Just bought this truck only thing the computer said was " service brake booster". Ok went on a 300mile trip about half way I was stuck behind a car going 65mph went to pass and the truck made a noise I lost power and ...
I replaced the water pump and test drove and worked great. I stopped to check for leaks and found none, but the temp started rising so I drove straight home. I them let truck idle and the temp went to 210 and them t...
OK, so I have this truck with an initial issue of a faulty fuel pump, improper fuel read on gauge and no oil pressure. I replaced the fuel pump/sender and the oil pressure switch. Those are both fine and now work grea...
One day they worked, the next they didnt. My radio n CD player seem to be working just as before but they are not putting out any sound. I even tried the DVD player in the back as well as the ONSTAR, Neither of which,...
Service Brake System (and ABS and Brake) warning lights sometime come on when starting vehicle. This has happened for several years but only occasionally. Now it is happening more often (several times a week) We hav...
I replaced fuel pumpe and it still says reduced engine power it happens wen i hit a pot whole or bump in the road
Already replaced fuel pump and fuel filter (1 of each) in last week.. it started sputtering again and quit.. after sitting for a while it cranked back up same as before a new fuel pump ...
The GMC engine is a 6.6 turbo diesel loaded with electrical devices.
This is a 2003 2500 series 6.6 turbo diesel