Eaton Gen 1 (AutoShift) Fault Code: 12 PID: SID 233 FMI: 12 Transmission ECU
Overview:
The code indicates an internal failure of the Transmission ECU.
Detection:
The Transmission ECU checks the program memory every time the key is turned on. If the transmission is able to detect a failure within its own memory, it sets this fault code.
Fallback:
This fault causes an In Place fallback while moving and a failure during system initialization.
Required Tools:
1) Basic Hand Tools
2) AutoSelect/AutoShift Troubleshooting Guide
Possible Causes:
1) Improper configuration software
2) Faulty Transmission ECU
![DOOSAN DMS-5 3.1.3 [2023.11] diagnostic software](https://www.ecuforcetruck.com/wp-content/uploads/2023/11/1-300x300.png)
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