You have a few options, from free to very expensive.

You can use a paperclip or short length jumper wire to trigger the built in diagnostics flash - engine management light flashes - then count the flashes. More here: http://www.clubcalibra.com/common-problems/guide-to-reading-ecu-codes/

Or you can buy opcom or similar from eBay or the likes - only works on the later models.

Finally you can buy the official GM reader but these tend to be very expensive.

Hope this helps.




Sent from my iPhone using Tapatalk

Out of interest Steva, which one is used for which models of the Calibra?


Sent from my iPhone using Tapatalk