Engine shuts off after transmission is shifted into gear

2000 GMC YUKON
185,657 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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YUKONPROBLEMS
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It runs great, no hesitation or anything but as soon as you put it in gear it shuts off. I’ve checked the fuel pressure and it’s 55 PSI at all times. New upper gaskets and throttle body gaskets, no vacuum leaks. Anyone have ideas?
Jun 26, 2022 at 8:25 AM
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STRAILER
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Does it stall when in reverse? When it shuts off does it seem like the torque converter is locked up? Can you please shoot a quick video of what's going on so I can see and tell you for sure what's wrong? We should run the codes, this guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

This guide can help as well:

https://www.2carpros.com/articles/stall-at-idle

Please run down these guides and report back.

Jun 27, 2022 at 3:33 AM
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YUKONPROBLEMS
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It shuts off as soon as you put it in any gear, but runs great in neutral and park. When shifted into gear it doesn’t pull or surge at all, it’s like turning the key off. Fuel pressure is good and doesn’t fall off when it shuts off either.
Jun 27, 2022 at 3:44 AM
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YUKONPROBLEMS
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here’s a video:
Jun 27, 2022 at 6:34 AM
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STRAILER
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That is a good one alright, it sounds like the gear range sensor is shorting out, this is difficult to test you may want to try just installing a new one to see what happens. Here is how and the location of the sensor. Also, let's check the air intake tube from the throttle body to the MAF sensor. No codes?
Jun 28, 2022 at 4:34 AM
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YUKONPROBLEMS
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No codes and there’s no cracks/leaks on intake tube. The gear range sensor tested good.
Jun 28, 2022 at 5:22 AM
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STRAILER
  • Experienced Mechanic
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It could be a short in a controller or circuit but to be sure let's do a CAN scan which is the future of automotive repair. You can get a CAN scanner from Amazon for about $30.00. here is a video to show you how and a link to a scanner from Amazon:

https://youtu.be/u-4syLc-ifQ

and

https://amzn.to/3OpAotj for the scanner

Let me know what comes up.
Jun 29, 2022 at 3:27 AM
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YUKONPROBLEMS
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I found the problem! It was the torque converter that stayed locked in gear and would stall once put in gear. Thanks for your help.


Jun 29, 2022 at 3:35 AM
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STRAILER
  • Experienced Mechanic
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Glad you found it. I should have known when you put it in any gear, in the video it seemed not to stall abruptly so I dismissed the converter. Here is how to remove the transmission and change out the torque converter:

https://youtu.be/ZC7xHVMKLRw

and this video will help

https://youtu.be/3vJAojsrfuU

Check out the diagrams (below). Please let us know what happens.
Jun 29, 2022 at 3:50 AM
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YUKONPROBLEMS
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I didn’t think so either but ran out of ideas and I looked around the bell housing and noticed several cracks. So, I disconnected the tc and the problem quit. So now I have to pull everything and replace stuff. Fun!!
Jun 29, 2022 at 3:56 AM
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