Get SKC on 2004 VW Jetta

[TylerPadrao]

Hi there! I just want to say the KW1281 test you have created is an amazing open source tool! Quick question! I am trying to retrieve my SKC code from my 2004 Jetta but am getting an error. The cable I am using (VAG-COM KKL 409.1 Cable) is being recognized on port COM3. The car ignition is in the on position. I am using both of the following commands on a Windows 11 computer:

kw1281test COM3 9600 17 GetSKC kw1281test COM3 10400 17 GetSKC

Here is the output along with the error I am receiving (Using 10400 for BAUD):

C:\Users\tjpad\OneDrive\Documents\Tyler's Docs\VW GLI>kw1281test COM3 10400 17 GetSKC KW1281Test: Yesterday's diagnostics...Today.

Version 0.86-beta (https://github.com/gmenounos/kw1281test/releases) Args: COM3 10400 17 GetSKC OSVersion: Microsoft Windows NT 10.0.22621.0 .NET Version: 8.0.0 Culture: en-US Opening serial port COM3 Sending wakeup message Wakeup duration: 2 seconds Reading sync byte Keyword Lsb $01 Keyword Msb $8A Protocol is KW 1281 (8N1) Caught: System.InvalidOperationException Received block end $20 but expected $03 Unhandled exception: System.InvalidOperationException: Received block end $20 but expected $03 at BitFab.KW1281Test.KW1281Dialog.ReceiveBlock() in C:\Users\gmeno\src\kw1281test\KW1281Dialog.cs:line 392 at BitFab.KW1281Test.KW1281Dialog.ReceiveBlocks() in C:\Users\gmeno\src\kw1281test\KW1281Dialog.cs:line 351 at BitFab.KW1281Test.KW1281Dialog.Connect() in C:\Users\gmeno\src\kw1281test\KW1281Dialog.cs:line 91 at BitFab.KW1281Test.Tester.Kwp1281Wakeup(Boolean ) in C:\Users\gmeno\src\kw1281test\Tester.cs:line 39 at BitFab.KW1281Test.Tester.GetSkc() in C:\Users\gmeno\src\kw1281test\Tester.cs:line 518 at BitFab.KW1281Test.Program.Run(String[]) in C:\Users\gmeno\src\kw1281test\Program.cs:line 253 at BitFab.KW1281Test.Program.Main(String[]) in C:\Users\gmeno\src\kw1281test\Program.cs:line 29

Here is the output along with the error I am receiving (Using 9600 for BAUD):

C:\Users\tjpad\OneDrive\Documents\Tyler's Docs\VW GLI>kw1281test COM3 9600 17 GetSKC KW1281Test: Yesterday's diagnostics...Today.

Version 0.86-beta (https://github.com/gmenounos/kw1281test/releases) Args: COM3 9600 17 GetSKC OSVersion: Microsoft Windows NT 10.0.22621.0 .NET Version: 8.0.0 Culture: en-US Opening serial port COM3 Sending wakeup message Wakeup duration: 2 seconds Reading sync byte Caught: System.InvalidOperationException Unexpected sync byte: Expected $55, Actual $95 Unhandled exception: System.InvalidOperationException: Unexpected sync byte: Expected $55, Actual $95 at BitFab.KW1281Test.KwpCommon.WakeUp(Byte, Boolean) in C:\Users\gmeno\src\kw1281test\KwpCommon.cs:line 76 at BitFab.KW1281Test.Tester.Kwp1281Wakeup(Boolean ) in C:\Users\gmeno\src\kw1281test\Tester.cs:line 32 at BitFab.KW1281Test.Tester.GetSkc() in C:\Users\gmeno\src\kw1281test\Tester.cs:line 518 at BitFab.KW1281Test.Program.Run(String[]) in C:\Users\gmeno\src\kw1281test\Program.cs:line 253 at BitFab.KW1281Test.Program.Main(String[]) in C:\Users\gmeno\src\kw1281test\Program.cs:line 29

What would be the cause of this error? Any insight is appreciated!

[TylerPadrao]

Hey Greg, I used the same command with version 0.85 and I was able to pull the SKC. Seems like the latest version 0.86 is throwing the above error. Just wanted to let you know.

[gmenounos]

This issue coincides with kw1281test's upgrade to .NET 8. Every version of .NET adds additional speed improvements, so I suspect that this is timing related. I've been able to reproduce the issue but it happens only sporadically. I believe I have a fix so expect a new version shortly.