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04-11-2017, 06:39 PM
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#1 |
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Registered User
Join Date: Nov 2014
Location: between AZ & NV
Posts: 67
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4l80 manual shift stuck in limp mode
Finished my 4l80 swap a few days ago. On the case connector, i have 12v to Pin E and Solenoids A and B grounded to toggle switches in the interior. She remains stuck in limp mode (2nd gear only).
this is how Ive got it wired https://www.youtube.com/watch?v=u1bA2pPm8G8 I don't have the TCC wired to ground yet. I also do not have the force motor/ PCS wired to to 12v or ground. Could this be the culprit? Or is it something else?
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*UNDER CONSTRUCTION* '80 Suburban C20 (C6P) (Silverado) - '68 472 (Edelbrock 1813, PH8026 LT's, H pipe) / '91 4L80 (manual shift,vac modulator, 350 converter) / 14B FF 3.21 G80 34' s/ '96 GMT400 interior Last edited by 85raiderburban; 04-11-2017 at 06:57 PM. |
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04-11-2017, 10:22 PM
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#2 |
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Post Whore
  
Join Date: May 2015
Location: Alabama
Posts: 14,670
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Re: 4l80 manual shift stuck in limp mode
Might want to try this in engine and trans section...clinebarger will likely see it there and give you the best answer
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04-11-2017, 10:27 PM
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#3 |
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Registered User
Join Date: Nov 2014
Location: between AZ & NV
Posts: 67
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Re: 4l80 manual shift stuck in limp mode
wow (FACEPALM) didnt even realize i put this in the wrong section.
__________________
*UNDER CONSTRUCTION* '80 Suburban C20 (C6P) (Silverado) - '68 472 (Edelbrock 1813, PH8026 LT's, H pipe) / '91 4L80 (manual shift,vac modulator, 350 converter) / 14B FF 3.21 G80 34' s/ '96 GMT400 interior |
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04-12-2017, 02:27 AM
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#4 |
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Registered User
Join Date: Dec 2011
Location: Regina, SK, Canada
Posts: 622
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Re: 4l80 manual shift stuck in limp mode
Just drop the dime and buy a controller, I have a tci unit and it has been flawless for years. Easy install and fully programmable. Well worth it.
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1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4 |
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04-12-2017, 08:14 AM
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#5 | |
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Registered User
Join Date: Nov 2014
Location: between AZ & NV
Posts: 67
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Re: 4l80 manual shift stuck in limp mode
Quote:
I asked why it is in limp mode and what could cause that. I didnt ask for overpriced hardware that im not interested in. Thank you for your concern
__________________
*UNDER CONSTRUCTION* '80 Suburban C20 (C6P) (Silverado) - '68 472 (Edelbrock 1813, PH8026 LT's, H pipe) / '91 4L80 (manual shift,vac modulator, 350 converter) / 14B FF 3.21 G80 34' s/ '96 GMT400 interior |
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04-12-2017, 01:59 PM
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#6 |
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Registered User
Join Date: Dec 2013
Location: Columbus, Oh
Posts: 367
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Re: 4l80 manual shift stuck in limp mode
If you do not have a computer it is not in Limp Mode. You need to find a ATSG service manual, it will tell you what needs to be activated in each gear and what each pin of the harness does.
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04-12-2017, 02:12 PM
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#7 |
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Registered User
Join Date: Dec 2013
Location: Columbus, Oh
Posts: 367
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Re: 4l80 manual shift stuck in limp mode
If you do not have a computer it is not in Limp Mode. You need to find a ATSG service manual, it will tell you what needs to be activated in each gear and what each pin of the harness does.
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04-12-2017, 09:49 PM
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#8 |
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Registered User
Join Date: Apr 2017
Location: CO
Posts: 58
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Re: 4l80 manual shift stuck in limp mode
1st I'd finish wiring it and see if that fixes it.
2nd I agree with Gradys performance. I'm fairly certain limp mode is programmed into the engine computer. Since you have no computer there shouldn't be anything telling it to be in limp mode. |
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