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4l80e super slow kick down

Old 01-12-2019, 09:01 PM
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Default 4l80e super slow kick down

02 4l80e was poping code for shift sol b. Changed the a and b solenoid and still has the same problem also if I go wot it takes 10+ seconds to kick down to second or first how probable is it that the wire harness is bad? 4>3 kick down does fine
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Old 01-13-2019, 12:16 AM
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Will also add, manually down shifting makes no difference
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Old 01-14-2019, 07:13 AM
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How probable is it that you've done any of the following
-scanned codes again
-used a good scanner to watch what is being commanded by the PCM
-done a pressure test

Super vague questions like yours will end up in random guesses from people that don't know what they're talking about
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Old 01-14-2019, 09:12 AM
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Cleared codes and still says solenoid b stuck. P0756. I can clear the code, take off from a stop and get all the way to 4th gear and aslong as I dont go back below 3rd it wont trigger, but as soon as it commands 2nd it throws the code. I can watch the scanner command 2nd when decelerating or when it needs to kick down but it takes 10+ seconds for it to get in 2nd and then throws the code.
I have not checked the pressure. Still need to find a pressure gauge
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Old 03-26-2019, 09:52 AM
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still fighting this issue. any help or ideas would be greatly appreciated

Update: finally got the pressure gauge on it, with trans harness unplugged from trans
Idle rpm is 850
P/N=80 psi at idle and 120psi at 2k rpm
R=60-80psi at idle and 240-250 at 2k rpm
1/2/3/D= 60-90 psi idle and 150-160 at 2k rpm.
with trans haness plugged in, all results are within ~10psi of the above pressures
also when I shift my rpms usually dip to 600 and the gauge goes down to 30 psi in all gear positions until rpms recover

My pressure gauge is too short to see the gauge wile going down the highway, but with the vehicle on Jack stands, selector in d, every time it shifts it drops to 30 then rebounds to the 90 range once the gear is engaged, as for my problem of the slow 3-2 kick down, it seems to be non existent wile on the Jack stands, all this done with light brake pressure to keep a little load on it.
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