Unrecognized PCM

[Meister]

I was trying to read a calibration from a 2008 Cobalt Sport, 2.4L E37 PCM and I got this error message. The PCM may have had a tune on it from some other software (vecta, vector, etc).

OS# 05549392
Calibration # 12618031
OS ID# AB
BCC# YRHA

9168

[Tordne]

Dealt with via email. Just so people know we didn't miss you :)

[GMPX]

Yeah, looks like there is someone out there messing with the OS numbers to confuse everyone tuning E37's, we'll get it figured out for you.

[Meister]

Thanks. I may end up flashing this thing back to stock... It was tuned before EFI and HP tuners had access to this

[Meister]

I spoke with the previous tuner and he claims the OS was not changed

[GMPX]

It was done on purpose Paul, GM don't have any OS numbers like that. We believe it might be Trifecta that did it.

[Meister]

I guess he is playing around. He sent me a "stock" tune and the same problem. I will reflash with a stock GM file

[GMPX]

FYI, that odd OS you have is really 12618032.

[Meister]

Thank you for the response. Andrew had mentioned this in an E-mail. Howard was at my shop today and got me running with a stock file that I read out