GMC Sierra 1500 Questions

Get answers to questions about your GMC Sierra 1500 at RepairPal. Find solutions, diagnose problems and get back on the road.

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Dont know. Much history about truck the previous. Owner. Has passed. But i put an obd2 on it an no codes fuses are good spedo Works . I've. Also beleve the trans is good. Anyone have any ideas it sure would help

It runs fine after the engine warms up to normal operating temperature. Why or what causes could there be?

Struck can not trun down or off unless pull the fuse

After Driving to store truck wouldn't restart After some testing found alternator failed so replace. Started find
drove few miles again wouldn't start. Tried jumping- check starter & battery
Disconnected power to Alternator after 10 min. reconnected truck starts fine WHY???

Started about two weeks ago. Today's date 12/24/15

it drives fine until i can hear the engine get to about thrd gear when the truck wants to get to about thirty miles an hour and then it idels super high and i have to throw it into tow and haul to get enough power out of it to get up to speed, but it doesnt stay there? Ive seen a couple Q and A"s that have said some thing about vacuum seal leaks and i do have a leak as well...please help

When both lights on the auto 4wd selector switch are lit up the switch gets hot and there is a grinding noise in the transfer case. When only the orange light is on everything is fine. Which light on the 4wd selector switch should be on when the truck is running?

When the vehicle is jacked up and I rock the rear wheels back and forth forcefully, I hear a clunk. It sounds like there is play between the axle and the crown gear.... or something!

will code po446 cause REAL problems to vehicle if not repaired?

Stalls out immediatley dies.Wont stay running!No trouble codes!

After driving at highway speeds for 50 miles and coming to a complete stop the transmission hits real going from 1st gear to 2nd gear. I just had the torque converter replaced so I know that's not it.

Head lights work turn signals work brake lights work no running lights or dash lights.

The starter stays engaged n the only way to get it to stop is take the battery cable off.put 2 new starters on works good for about a month then happens again.

I need to smog my truck in California and I have to incomplete monitors. 1 is Evap and the other is secondary air. I can't figure out what my issue's are.