Take it to a reputable trans shop. These transmissions are controlled by a computer. If this is a 2500 or 3500 Yukon, I bet it is equipped with the 4L80E transmission. These have a tendency to allow transmission fluid into the large electrical connector, and it shorts out wires and can make things go crazy. There is a way to silicone the leak and fix it(videos on YouTube) or a good honest shop can do it without replacing parts.
SOURCE: While driving engine shuts off
I had the same issue with another GM and never got it resolved except by replacing the battery.
Finally put it one that keeps good voltage while park or running.
Wall mart sells a $20 alternator and battery checking device you plug into a power socket.
Its digital read out is better for my eyes than the dash board one and has idiot color codes red yellow and green,
Some batteries seem to get shorted cells and that lower voltage can lead to engine shutdown even while driving. You would think a good alternator would keep the engine running but these new low rpm designs with heavy load...
This is all experience and I do not claim to be a GM tech.
SOURCE: 1998 Yukon high idle sound with bad gas mileage.
What you have is the torque converter clutch,cycling on and off.
When it is off.your rpm will go up and your milage will go down
First-check to see if your brake switch, on the back of the brake peddle, is loose or misadjusted. When you apply the brakes,the first thing to happen, is that you unlock the converter,so your trans is not connected directly to the motor,or you would stall. Then below 42 MPH,your trans is working off the converter, as a pressure multiplier ,based on rpm
Second- switch okey. You remove trans pan and change TCC Solenoid.
Let me know if if you need more guidance
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SOURCE: My jimmy won't shift into high gear or reverse, it
Does it also hold first gear longer that it should and then shift right from 1st to 3rd? It sounds like you broke the sun shell in the transmission. The trans will need to replaced or rebuilt.
SOURCE: 3 days ago, i went
I ran into the problem and it was corrosion on the battery terminals. on the inside against the battery. also check the the terminals for good connection.
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