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Why is there smoke coming from transmission dipstick tube?

Tiny
HUNTER ATHERTON
  • MEMBER
  • 2007 GMC SIERRA
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 247,000 MILES
I recently installed a new transmission and haven’t added anymore fluid than what I have already due to even running the truck a minute or two I take out the dipstick and it lets out some pressure and smoke comes out.
Sunday, July 24th, 2022 AT 7:35 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,909 POSTS
As long as you don't drive the truck you are okay, it sounds like it is low on fluid and what you are seeing is fluid vapor, start the tuck on level ground and add fluid until full. The problem should go away. Here is a guide to help:

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

Please run down this guide and report back.
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Monday, July 25th, 2022 AT 11:11 AM
Tiny
HUNTER ATHERTON
  • MEMBER
  • 4 POSTS
Edit: Sorry I didn’t thoroughly read your reply.
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Monday, July 25th, 2022 AT 2:44 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,909 POSTS
No problem. Please let us know what happens. I was thinking there are electronics inside the transmission but they should blow a fuse before smoke can occur.
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Tuesday, July 26th, 2022 AT 1:14 PM
Tiny
HUNTER ATHERTON
  • MEMBER
  • 4 POSTS
I let it run to the operating temperature and filled it to the safe line and she shifted like a dream. Thank you
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Tuesday, July 26th, 2022 AT 6:50 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,909 POSTS
Good to hear, please use 2CarPros anytime we are here to help.
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Wednesday, July 27th, 2022 AT 12:46 PM

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