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GMC Questions

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It was driving fine then it wouldn't go please help me

6.5 turbo

I have replaced head gaskets, checked valves and lifters and they are good. Replaced spark plugs, distributor cap and still get the code P0300 and no check engine light

Just started about a month ago

Horn works normally when truck is cold and not running. Works when truck is started. Stops working as soon as transmission put in D and brake pedal released. Will not work again until truck turned off and cooled down. I have changed the horn relay- no change. What next? Scan tool?

Mph goes. Crazy rpm too. Lights flicker sounds like not picking up speed

Got in the car this afternoon and started the engine. After idling for about a minute it shut off. I restarted the engine only to find it idling very hard (it wasn't before). I started to leave the lot and the vehicle seemed to be jerky when trying to accelerate. Shortly after the engine light began to blink. I got the car home (about 2.5 miles) and turned then engine off. At this point I became aware that the blower fan was running on high without the key in the ignition.

Any thoughts are greatly appreciated.

All those issues only work with my headlights are turned on then I have power to all them systems if I don't have my headlights on I have no power to my radio my power seats my power locks my brake lights don't work all unless my headlights are on

It won't work the radio does work at the navigation CD when I come out when I hit the eject button

that fuss box has been replaced. the switch in side turns off everything but headlights.

I have no idea where it come from or how to prevent it.

4.3 V6 automatic trans

Need to replace window

engine light on,nothing else works.

When ever i run my a/c or pull my boat my engine starts to run hot ..i change my water pump and all belts and thermostat ..cooling temp sensor and all hoses ..and was told air might be in system but had that looked at also ..if i sit in traffic or stop at lights it runs hot as soon as i start again or turn a/c off it returns to normal temp .. I even run dexcool as directed

Sorry for the double post, in another thread I posted as my car being a 2005 Trailblazer, my car is a 2004 Envoy. I can't figure out how to delete the other one.

My daughter left a car seat warmer plugged in over night and my battery was dead the next day. I jumped the vehicle and it fires up nice and smooth and sounds like everything is great, but the car runs for about 1 second then shuts off. My key fob will no longer unlock the car or do anything, the locks won't engage or disengage when the button is pressed, the stereo won't turn on.. The dash reads Unknown Driver instead of Driver 1 Driver 2.

I tried the 30 minute reset procedure, but I may have done it wrong, because there is no SECURITY light that flashes or even comes on for that matter. There isn't a Check Engine Light on, or any indication that something is wrong, the car simply starts and shuts off immediately. I have two keys, neither of them work.

So far I have tried to put the ignition in the on position, let it sit for 10 minutes and turn it off for 5 seconds and try to start it. That didn't work, so I tried to do that 3 times over, but one thing was missing from the instructions that I followed: the part where the security light blinks or turns off after 10 minutes.

Also, Does anyone know which anti-theft system this vehicle has?

Going around a curve to the right, the steering wheel will operate smoothly until it reaches a point of resistance until I break through it. It'll then operate smoothly until I reach that one small point of resistance again. No noise or vibrations.

mounted new starter . went to reconnect battery, touched red to terminal and the van cranked without key in! What is wrong? Is ECU involved?

highway mileage is bad. engine runs strong and does not use oil.

I've changed my hydrolic booster my master cylinder brakes rotors and it still locks up on me

Had battery replaced now seat controls and mirrors won't work where is the problem

Ok here is my store. Have had the truck for 15 year. Daliy driver. Stopped driving it about a year ago. Only on the weekend. 6 months ago I put in a new starter and a new distributor due to it blowing ignition fuses. 2 month ago. I had to jump it to get to work. Got to work and it would not start again. The battery was old and not holding a charge. So it stat still for about a month. Just got a new battery but now it won't turn over. I did a tune up on it just to make sure but still won't turn over. I checked the coil and plugs for spark and it dose have spark. It has gas(half tank). I can smell and see fuel in the throttle body so fuel is getting to the injecters. But still won't turn over. It wants to but doesn't. Any ideas or area to look at. Also I do have a msd ignition on the truck.

right side mirror glass doesn't show turn signal anymore ? is that just a glass issue ? or input everything else works ok ?

Doesnt matter if the engine is cold or 200 degrees my idle in park is roughly 700rpm and feathering the gas peddle when putting it into gear seems to have no effect. Already replaced the idle air control valve even tried changing the TPS though I think the new one is bad as it idles at 1500rpm and the engine still stalls when putting into drive/reverse. Thus far no check engine light.

I ordered the pump for the smaller engine and would like to know if it will work

what to change coolant how much dose it hold

while starting from a stop between 15 and 20 m/h I feel a jerking and when driving between 30 and 60 no problem. When slowing down to a stop if feel like it wants to stall. Replaced the torque converter clutch solenoids, and filter.

Says stability sys disabled since I changed rear brakes and rotors, has never said that before, what happened?

aalso shake bad over 40 miles per hour

sometimes cuts off when backing up, slight smell coming from exhaust.