Code Y3/8n4
Thread Starter
Newbie
Joined: Jun 2026
Posts: 2
Likes: 0
2017 Gle350
Code Y3/8n4
New main battery because voltage low codes Prior to and after new battery got quick on off message “do not shift gears”. No limp mode shifts through gears. After battery still getting message quick on and off i. Lower gears and the y3/8n4 code for trans control unit. Any experience with this ?
Super Member
Joined: Nov 2007
Posts: 503
Likes: 138
From: Washington D.C. area
16 GLE400 4matic
Sensor/Circuit failure in the Conductor Plate or fluid contamination due to electrical adapter plug and traveling up the wiring harness.
Last edited by amusa; Today at 05:01 AM.
Thread Starter
Newbie
Joined: Jun 2026
Posts: 2
Likes: 0
2017 Gle350
I found out my mechanic used the wrong trans fluid and overfilled when I had it flushed 2k mile ago. It was also burnt from overheating. Now, I need a new valve body. In concerned about other internal damage.
