Software 55595656 55576791 55499815 55489650 5550 Siemens/Continental
4 master projects carry this software number, 4 with a modified version. Upload your read to have the tune transferred into your own file, or buy the file exactly as we hold it by software number. Modified files from $275, original (stock) files from $75 AUD. Trade accounts see their own pricing after log in.
Fitted to
Holden ×2
Holden Colorado
Holden Trailblazer
ECU
Siemens/Continental
GM
Hardware / part numbers
028182138
Read with
any full read from your flashing tool
Modifications available
- Stage 1 ×1
- EGR off ×3
- DPF off ×2
- Swirl flaps off ×1
Have the read? Upload it.
Upload your read →
Your own file comes back with the modification built in, checked for a 100% match before it's offered.
Can't read the ECU? Buy by software number.
See files & prices →
The stock or modified file exactly as we hold it, to write with your tool. Make sure your ECU carries
55595656 55576791 55499815 55489650 5550 and the same hardware number.Vehicle pages: Holden Colorado · Holden Trailblazer
Files are supplied for off-road / motorsport use; checksums are corrected by your flashing tool on write. Last project update 2026-09-11.