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03-04-2019, 09:40 AM
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#1 |
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Registered User
Join Date: Sep 2018
Location: Cocoa Beach, FL
Posts: 12
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4L60 stuck in Limp mode
Just completed my 2002 5.3 / 4L60 swap into my 72 GMC and the trans seems to be stuck in limp mode. Reverse and 2nd, 3rd while in drive. I have power to the trans but no error codes to the computer. I have not hooked up the TCC but I don't think that would put it in limp mode. Fluid is good and I everything is hooked up correctly. Any suggestions? I am at the point of sending the computer to be programmed to see if the issue is there. I would think I should get some error from the trans if there is a problem.
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03-04-2019, 10:25 AM
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#2 |
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Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 4L60 stuck in Limp mode
Did the trans work before the swap? Doubt it's a computer issue.
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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03-04-2019, 11:21 AM
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#3 |
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Registered User
Join Date: Sep 2018
Location: Cocoa Beach, FL
Posts: 12
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The engine and trans came from separate vehicles. Buddy of mine put them together, modified the harness, and reprogrammed the pcm.
Posted via Mobile Device |
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03-04-2019, 12:05 PM
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#4 |
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Registered User
Join Date: Sep 2018
Location: Cocoa Beach, FL
Posts: 12
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The engine and trans came from separate vehicles. Buddy of mine put them together, modified the harness, and reprogrammed the pcm.
Posted via Mobile Device |
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03-05-2019, 10:46 AM
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#5 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: 4L60 stuck in Limp mode
Trans error won't always pop codes, trans codes themselves won't appear on all types of scanners. If your friend tuned it he should be able to command specific gears in HP tuners and see if it complies.
__________________
'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  Last edited by BR3W CITY; 03-05-2019 at 12:55 PM. |
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03-05-2019, 12:33 PM
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#6 |
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Senior Member
 
Join Date: Jun 2015
Location: Atlanta, GA.
Posts: 737
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Re: 4L60 stuck in Limp mode
On the LT1 Swap page he talks about one circuit that feeds the transmission solenoids.
http://www.lt1swap.com/underhoodfuseblock.htm I forgot to wire this on my swap and it felt sluggish. Like starting in second gear. Once I dove into it and wired the circuit up correctly, my truck runs great!
__________________
Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project |
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