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4L80E won't shift out of 1st

You were right on. I unhooked the battery for a few minutes, hooked it back up, and it shifts like a dream. The oil pressure and temp gauges are still acting funny. The oil pressure swings all the way to the right as soon as you start the engine. Sometimes when the engine is idling in gear...
- dmak
- Post #6
- Jun 13, 2022
- Forum: Transmissions
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4L80E won't shift out of 1st

I'm not sure. I don't have access to a scan tool unless i go into town, which is a bit of a trip for me. Is there another way to tell if it's in limp mode? Thanks for the help!
- dmak
- Post #4
- Jun 13, 2022
- Forum: Transmissions
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4L80E won't shift out of 1st

I bought a 1995 gmc 2500 4x4 last fall with a 5.7 liter and 4L80E. It was not running at the time and had been sitting for at least a year as of October 2001. I ended up putting a rebuilt engine in it this spring. I drove it for about 100 miles, and everything was fine. It ran and shifted...
- dmak
- Thread
- Jun 12, 2022
- Replies: 15
- Forum: Transmissions