What OS (operating system) are you using in the PCM ?
What OS (operating system) are you using in the PCM ?
Have no idea - can I tell from the label on the ECU?
The label won't help. Do you have tuning software ?
The early Gen 3 truck operating systems (1999, 2000, and some 2001) don't seem to operate electric fans correctly.
The 2002 trucks with OS 12212156 will correctly operate electric fans.
No, not yet - I have a scanning tool - will that tell me?
Depends on the scanner. EFILive's Scan Tool will display the OS.
Its an Actron - guess I can try and see - will probably be tomorrow though
Last edited by BBPanel; 08-10-2016 at 12:18 AM.
Could not find OS but I found VIN and it translates to a 2002 GMC Sierra 2500HD 2WD.
I take that back - there is a CAL ID - 12212156
Hi dearOriginally Posted by BBPanel
you can know your os number with EFilive
read flash chip with programmer
download and instal EFI live v7.5 web
open file with EFIlive
you can see all the iformation about your file image
note : if EFIlive can't open your file , conver file from Little Endian format to BigEndian or visa versa.
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