4l80 manual shift stuck in limp mode - The 1947 - Present Chevrolet & GMC Truck Message Board Network

85raiderburban · 04-11-2017, 06:39 PM

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?

**mongocanfly** · 04-11-2017, 10:22 PM

Might want to try this in engine and trans section...clinebarger will likely see it there and give you the best answer

85raiderburban · 04-11-2017, 10:27 PM

wow (FACEPALM) didnt even realize i put this in the wrong section.

bilfman · 04-12-2017, 02:27 AM

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.

85raiderburban · 04-12-2017, 08:14 AM

Quote:

Originally Posted by bilfman

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.

SOME of us dont want a computer wired into our drivetrain.

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

GRADYS Performance · 04-12-2017, 01:59 PM

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.

GRADYS Performance · 04-12-2017, 02:12 PM

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.

85raiderburban · 04-12-2017, 08:48 PM

1750 rpm keeping it at 30 mph = stuck in 2nd gear. thats why i meant by "limp mode" i dont have 1st, 3rd or OD. will have to get back on this one....

rwdmayhem · 04-12-2017, 09:49 PM

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.

04-11-2017, 06:39 PM	#1
85raiderburban Registered User Join Date: Nov 2014 Location: between AZ & NV Posts: 67	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? Attached Images __________________ 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.

04-11-2017, 10:22 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,670	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

04-11-2017, 10:27 PM	#3
85raiderburban Registered User Join Date: Nov 2014 Location: between AZ & NV Posts: 67	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

04-12-2017, 02:27 AM	#4
bilfman Registered User Join Date: Dec 2011 Location: Regina, SK, Canada Posts: 622	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. __________________ 1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4

04-12-2017, 01:59 PM	#6
GRADYS Performance Registered User Join Date: Dec 2013 Location: Columbus, Oh Posts: 367	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.

04-12-2017, 02:12 PM	#7
GRADYS Performance Registered User Join Date: Dec 2013 Location: Columbus, Oh Posts: 367	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.

04-12-2017, 08:48 PM	#8
85raiderburban Registered User Join Date: Nov 2014 Location: between AZ & NV Posts: 67	Re: 4l80 manual shift stuck in limp mode 1750 rpm keeping it at 30 mph = stuck in 2nd gear. thats why i meant by "limp mode" i dont have 1st, 3rd or OD. will have to get back on this one.... __________________ 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

04-12-2017, 09:49 PM	#9
rwdmayhem Registered User Join Date: Apr 2017 Location: CO Posts: 58	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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