4l60 codes after a swap
Thread Starter
Teching In
Joined: May 2022
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From: Dallas
4l60 codes after a swap hey guys finished my motor swap on a 2003 Silverado, mated a 6.0 with my built 4l65, which did see use in my previous setup, ran fine no codes, well after dropping it back in I'm getting code P01860, P0740(TC clutch circuit open), P0785(Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical), P0753(Powertrain Control Module (PCM) has detected an electrical abnormality in transmission shift solenoid A.), and some manufacturer control codes, these where not present before and i cant figure it out, there all at the same time could i just be having ground issues? did i somehow blow the trans? any help would be appreciated.
Last edited by AnthonyM214; Sep 6, 2022 at 10:40 AM.
Thread Starter
Teching In
Joined: May 2022
Posts: 8
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From: Dallas
very ignorant question coming your way, do they have to be grounded to the heads? went off if its metal its ground one of the back plugs is grounded to the block.i figured it was a good ground as any,
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Joined: Oct 2016
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From: PDX-OR-USA
The head ground was done to avoid a problem with some engines, where the heads did not get a good ground via the block and head bolts, the MLS gaskets coating from some vendors is non conductive/poorly conductive. Caused coil mis triggers and weak spark. Seen it at the track a time or two.. I'm sure its far from a 100% problem , but My L33 WILL NOT fire correctly if the head grounds are not perfect, I had to move the left one from the block to the head. (Wasn't paying attention and used the wrong bolt hole.. )
Thread Starter
Teching In
Joined: May 2022
Posts: 8
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From: Dallas
Alright ig ill try moving my block grounds to the heads, hopefully it will help seems like an electical/ ground problem well i hope anyway, trans was ok before, do you happen to know what head the grounds went to, my first swap so i kin of forgot took the truck apart months ago
