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Old 01-21-2018, 09:23 AM   #1
krue
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4l80E questions

I have an '03 GMC van with 6.0l and 4l80E for swap purposes. The van was a Dept. of Corrections van and they had been using it for parts. It has no gage panel so I can't tell what gear the tranny is indicating. That matters because the tranny is in limp mode (only 2nd and R) and I am trying to figure out why before I pull it. There is tranny fluid in the round connector and some sources say that could be the problem and others say not. The plug does have power to it with the key on. What should I be looking for? Replace the harness? If so where is the best source for replacement.
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Old 01-21-2018, 09:25 AM   #2
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Re: 4l80E questions

You need to read the trouble codes. It sounds like an electrical problem and trans fluid in the connector is a problem.
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Old 01-21-2018, 09:50 AM   #3
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Re: 4l80E questions

Only code it shows is a temp. sensor voltage, don't remember the number off the top of my head.
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Old 01-23-2018, 03:32 AM   #4
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Re: 4l80E questions

Anyone else?
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Old 01-23-2018, 03:42 AM   #5
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Re: 4l80E questions

Limp mode is 2nd and 3rd, but if you say it doesnt have power going to it when the key is on, then you need to figure that out since that's probably the problem. Check all the fuses.
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Old 01-23-2018, 07:54 AM   #6
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Re: 4l80E questions

The plug does have power with the key on.
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Old 01-23-2018, 01:10 PM   #7
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Re: 4l80E questions

Quote:
Originally Posted by krue View Post
Only code it shows is a temp. sensor voltage, don't remember the number off the top of my head.
Depends on what scanner your using. Most regular scanners will show regular DTC trouble codes (P codes). A Tech2/3 or reading via HPT Ecm scanner will show you the extended codes (T, U and BCM codes), and it will also show gears.

I'll have to check back through some of Clinebargers posts, he's the resident trans expert and has previously posted his preferred sources for trans harnesses.
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Old 01-23-2018, 08:28 PM   #8
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Re: 4l80E questions

Quote:
Originally Posted by BR3W CITY View Post
Depends on what scanner your using. Most regular scanners will show regular DTC trouble codes (P codes). A Tech2/3 or reading via HPT Ecm scanner will show you the extended codes (T, U and BCM codes), and it will also show gears.

I'll have to check back through some of Clinebargers posts, he's the resident trans expert and has previously posted his preferred sources for trans harnesses.
Thanks, will do.
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