Likely a rotating part hitting a resonant frequency. It might be a universal joint on the drive shaft, a wheel out of balance or tire out of round. You might try lightly touching the brakes while maintaining the same speed. If it's something to do with tires or wheels, that would likely stop it. My first car would oscillate violently after hitting a bump in the road, due to a loose suspension part.
SOURCE: Cadillac Deville 2000- Engine check light code P0741
If you like go ahead and let someone sell and replace your transmission but here is my suggestion! Check around and see if you can find a minor vacuum leak! This can simply be the big round hose that goes from the fuel injection to the power brake hub! This is normally a push in connector which has about a 1/2 inch hose clamped on it! If there is any kink or the connector is not in correctly a leak will occur and the transmission will shift rough as though you will be thrown out of the vehicle! Try unplugging this connector and plug it back in hard and straight and maybe you will be lucky and fix your problem. If the vacuum is correct your transmission will shift better than you have ever experienced!
SOURCE: where is the oil filter located on a cadillac srx
Directly under the engine. You'll see a large smooth portion under there that looks like the underside of a bath tub and on the lowest portion of that is a bolt. Thats your oil reservoir where you drain your oil. The filter should be located near that pointing toward the front of the vehicle. GM OEM filters are usually black but could be white and are almost always 3" filters so a filter wrench that fits a 3" filter will get it off without problem.
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SOURCE: rear liscese plate bulbs on 05 cadillac srx
First you have to take out the one and only screw in the rear hatch door - it's where the hand pull down is you use to close the hatch.
Then you have to pop all the plastic clips all the way around the plastic door panel, trying not to pull them out from the frame . If you do pull out the white plastic plugs from the frame you better make certain you take them off the plastic housing and insert them back into their frame holes - or you will never get the housing back on.
Once you have the housing loose disconnect the inside tail gate light wire to remove the whole thing. Then you have to remove 7 to 8 nuts from the back of entire License plate, back up bulb housing using a deep socket to get in there. Work it loose from the rear of the car and it will come out just enough to work on the lights.
This is tricky since the screw mounts don't give you much room to work with.
Once you have the license plate and back up bulb frame loose you will see the two housings for the license plate bulbs on top.
Slide out the license plate bulb lens and twist the bulb connection to remove the bulbs.
Replace both of them - you don't want to do this again in a month when the other one blows.
OPTIONAL:
Once you take out the bulbs you might see that the housing is melted where the bulb wanted to burn through. Drill two small holes one is each end of the housing before I put everything back together to release some of the heat.
Reverse the whole process to put everything back together. It's not easy.
Make sure you insert the cables through the opening for the hatch handle or it will kink and not work properly.
The bulbs come in a two pack of cost $4.95 .
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