Lost 3rd and 4th outta no were?

Tiny
JUNIORANDTAYLOR
  • MEMBER
  • 2007 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 330,000 MILES
I am getting a code on my scanner saying ign 1 circuit low/open on bcm pin 1 and 5. Reason for checking it was I lost 3rd and 4th gear outta know were. I know the trans is still good because when I pull the fuse for the trans I got 3rd and 2nd
Tuesday, December 2nd, 2025 AT 4:09 PM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Hello,

I can help you fi the problem, please tell me which number code you are getting. It sounds like you have a shift solenoid that is out which can cause this issue. The transmission takes 3 fuses to run here is a guide to help you test the fuses and to make sure they are getting power.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the images (below). Let us know how it goes
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Wednesday, December 3rd, 2025 AT 10:18 AM
Tiny
JUNIORANDTAYLOR
  • MEMBER
  • 2 POSTS
Im getting codes 1370-06 and a u0100 or something like that. Which says ignition short to ground. What I really need is a wiring diagram and pin out. Its a 07 suburban. 5.3 and 2wd
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Thursday, December 4th, 2025 AT 8:02 PM

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