Hi,
The code is related to the lock-up solenoid. In most cases, the solenoid itself goes bad and needs to be replaced.
The solenoid is mounted to the valve body inside the transmission. If you look below, I attached the directions for the solenoids. The SLU solenoid is the one related to the code.
Take a look through the directions and let me know if it is something you are comfortable doing. If you remove it, I can tell you have to check it.
Let me know.
Joe
See pics below.
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Saturday, August 28th, 2021 AT 10:54 PM