GMC Sierra 2500 HD Questions

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I put fluid back in but it shifts hard and on down shift also. And the engine will rev up but truck won't go sometimes, or it won't go into gear. The tranny temp says 168.put new tranny cooler on it cuz a rock went th...
Drove truck few mile light stayed on. Started it to drive to mechanic, light went out as expected. Following starts Light stays on truck starts and runs fine. Mechanic checked both batteries, claims they are good. Th...
I have put A crate engine into this vehicle and now the transmission will not switch to 4th gear. When driving 55-60 my Rpm's are around 2500-3000. When I left off the gas it acts like it upshifts. But when I apply th...
I have a Check Engine Light On - So I called OnStar and they said the item that is coming up for service is a 'Emissions Reduction Heating System'. Does anyone know what this is and if it is under warranty. Should I b...
I replaced cam sensor but still flashes someone said something about a ground getting frustrating any suggestions
I've noticed that sometime the dash light are dim or off even though I've adjusted the switch all the way up - also noticed the headlights go out after turning off the truck faster than in the past. The battery indica...
what might be my problem with my 4x4 front diff. 4- low you can hear the solenoid engage but just a whirling noise. And know 4- high dose not stay in all the time. This a 2005 GMC sierra 4x4 2500 HD auto trans
Gauge shows no pressure. Installed manual gauge in port above oil filter. 55 lb. Any way to know it is the sending unit & not the gauge in cluster?
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 ...
Have lost all sound to speakers, gauges don't cycle till after starting truck, always says my drivers door is open, alarm goes off when I go to start it, doors won't unlock unless truck is running, have checked all wi...
Had truck at dealer and they replaced the ignition switch and the drivers door lock thinking this was triggering it to come on randomly but it still happens. Dealer has had it now for 2 weeks with nothing happening. T...
No fluid loss abs was acting up at low speed just before stoping
I bought the truck used and the right rear window has always randomly went up on its own then will not work at all for a day or so. My driver window started this and now is stuck an inch down. When I hit the switch ...
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...
the crankshaft sensor may to blame (I've been told)but how can I be certain before I repair and where is it located?
when the engine is shut off and then restarted the fuel gauge returns to normal?