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4l80e swap codes

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Old May 17, 2012 | 07:59 PM
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Default 4l80e swap codes
Put in a 99 PCM in a 98 trans am, did a repin of the harness, did a 4l80e swap out of a 2000 2500hd with 105k, getting codes p0748 an p0758,!the car takes off in second an will not shift to first, or will it shift to first manually........ Any IDEAS!!!!!
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Old May 18, 2012 | 09:00 AM
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Bump....Need help!! How can I check if the transmission segment was swapped correctly? What should I should be checking?
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Old May 18, 2012 | 10:07 AM
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1999 PCM out of what vehicle...?
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Old May 18, 2012 | 10:08 AM
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You will have to double check your pinouts.


BTW: Did you repin the TCC PWM signal...?
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Old May 18, 2012 | 12:36 PM
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Originally Posted by joecar
You will have to double check your pinouts.


BTW: Did you repin the TCC PWM signal...?
I have double checked all the pinouts. What is PWM?
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Old May 18, 2012 | 04:33 PM
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Originally Posted by joecar
1999 PCM out of what vehicle...?
....?
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Old May 19, 2012 | 09:55 PM
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Originally Posted by joecar
....?
99 1500 4.8/auto
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Old May 20, 2012 | 11:32 PM
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Originally Posted by Shinn98ls1
99 1500 4.8/auto
I don't know my trucks too well, I assume it had a 4L60E, right...?
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Old May 20, 2012 | 11:34 PM
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Even if you do the trans segment swap you have to move the pin for the TCC PWM signal at the trans connector.
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Old May 21, 2012 | 10:40 AM
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Originally Posted by joecar
Even if you do the trans segment swap you have to move the pin for the TCC PWM signal at the trans connector.
This is a buddy of the OP. He bought the wiring adaptor from speartech that was plug and play. Is this still needed to swap the pinouts at the trans?
Last edited by onebaddmax; May 21, 2012 at 01:11 PM.
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Old May 21, 2012 | 11:54 AM
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Originally Posted by joecar
I don't know my trucks too well, I assume it had a 4L60E, right...?

Yes, the new PCM came from a 1999 1500 4.8/4L60e
Last edited by onebaddmax; May 21, 2012 at 01:12 PM.
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Old May 21, 2012 | 02:24 PM
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Originally Posted by onebaddmax
This is a buddy of the OP. He bought the wiring adaptor from speartech that was plug and play. Is this still needed to swap the pinouts at the trans?
If the harness is for 4L80E then is should already be ok.
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Old May 21, 2012 | 09:20 PM
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Originally Posted by joecar
If the harness is for 4L80E then is should already be ok.
Any other ideas?
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Old May 21, 2012 | 09:53 PM
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You will have to check the harness by checking continuity between the PCM connector(s) and the trans connector to make sure it is wired right... you will need wiring diagrams for PCM used on a 4L80E platform and for 4L80E trans connector also.
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Old May 22, 2012 | 05:46 AM
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Originally Posted by joecar
You will have to check the harness by checking continuity between the PCM connector(s) and the trans connector to make sure it is wired right... you will need wiring diagrams for PCM used on a 4L80E platform and for 4L80E trans connector also.
Will do that this evening. Thanks
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Old May 22, 2012 | 08:45 PM
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Problem solved. Turned out to be when one of our other buddies helped us throw the trans in he had plugged in the connector upside down. Too many cooks in the kitchen.....but on a side note, this thing whines loud in first gear and from what I read it's normal, but why?
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Old Jan 1, 2014 | 09:20 AM
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Originally Posted by onebaddmax
Problem solved. Turned out to be when one of our other buddies helped us throw the trans in he had plugged in the connector upside down. Too many cooks in the kitchen.....but on a side note, this thing whines loud in first gear and from what I read it's normal, but why?
I dont like playing thread jesus and rezzing the dead, but mine was the same exact problem. My connector on the trans is cracked and allowed the plug to go in backwards. Thanks for the update, saved me a bunch of time.
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Old Mar 28, 2014 | 09:48 AM
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Originally Posted by onebaddmax
Problem solved. Turned out to be when one of our other buddies helped us throw the trans in he had plugged in the connector upside down. Too many cooks in the kitchen.....but on a side note, this thing whines loud in first gear and from what I read it's normal, but why?
Originally Posted by vwdave
I dont like playing thread jesus and rezzing the dead, but mine was the same exact problem. My connector on the trans is cracked and allowed the plug to go in backwards. Thanks for the update, saved me a bunch of time.
Which plug was it that was upside down? I'm dealing with the same exact issue and REALLY hope this is all it is.
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Old Mar 28, 2014 | 12:28 PM
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Originally Posted by WS6HUMMER
Which plug was it that was upside down? I'm dealing with the same exact issue and REALLY hope this is all it is.
The main round connector on the drivers side.
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Old Mar 28, 2014 | 01:12 PM
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Originally Posted by vwdave
The main round connector on the drivers side.
Thanks, I assumed that and gave it a shot & it fixed my problem too. Thank goodness for this thread!
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