Battery voltage = 12volts or higher standing
battery voltage while trying to start = 10volts or higher
battery cables tight,clean, no corrosion
starter turning engine over
check for spark at plugs
fuel in tank
air able to make it into combustion chamber through air filter
fuel arriving at cylinders through fuel injectors
when you turn key on, dash lights come on and then go off .
well this should get you started diagnosing your no start condition
SOURCE: 4X4 inop on 2003 GMC Sierra 2500HD
I have found that when you are going to engauge 4x4 high, it is best to only be going about 3 miles an hour. Not faster, not stopped. It likes some movement to help it mesh. I've had perfect shifts since I started this. Hope it helps. Wade.
SOURCE: 2005 GMC Sierra Overheating
If your sure there is no trapped air in system after refill and air bleed off, is fan clutch pulling good air thru radiator? Even if it is, the heater should have coolant as hot as what temp gage is showing! Try backwards flushing heater core (dex cool is notorious for plugging these up). There is a TSB for cracked cylinder heads from GM for unexplained coolant loss.Remove drivers side valve cover, and look at center three head bolts for coolant around them, if coolant has been getting in thru this suspect area, there will be a milky/pudding like goo under valve cover and on head. GM had a company called Castec cast these and the areas near the head bolts were found to be too porous (NO recall YET!) Ya, you guessed it, replace heads! Unfortunately, if its gotten hot to many times, it has probably hurt the heads/gaskets. Hope this helps. PS: The castec logo is under the rearmost pair of rocker arms,may have to remove them to see.
SOURCE: why wont my 2001 gmc sierra 2500hd go into 4th gear?
Check to make sure you don't have the TOW/HAUL switch on the end of the tranny stalk turned on
SOURCE: 2005 gmc sierra 2500hd heated seat turns off
you have a couple of problems first of all your drivers sd=ide heated heat pad is probably faulty, for your heating problem you may have to get the hvac doors recalibrated.
SOURCE: 2005 GMC Sierra 2500HD 6.0 Won't turn over
I have seen many ign switchs. Check to see if the theft doesn't flash when you try to start. It is still posable that the starter is going. Have someone crank the engine. Check for power on the purple wire. If there is power and the it does not crank. Check that the big wire has a soild 12 volts. You can use a screw driver and jump the purple and the big 12v battery at the starter and it should turn on if not replace the starter
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