When using ecuhelp KT200 to write Chevrolet Delco E39A, get “error SK1”, “Error SilentKey” (shown as below).
![](https://blog.obd2gate.com/wp-content/uploads/2023/01/kt200-delco-e39a-error-silentkey-01-1024x730.jpg)
Solution:
This ECU type of Chevrolet Delco E39A is new with 5bit seed,you need to read password by io-prog, then read flash.
![](https://blog.obd2gate.com/wp-content/uploads/2023/01/kt200-delco-e39a-error-silentkey-02-1024x1024.jpg)
Related video demo for your reference: I/O PROG Read Write GM ACDelco E84 ECU on Bench
The similar operate guide as E39A: