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RPO

Regular Production Order. These are the codes that GM uses to identify options.

For example, LT1 is the RPO for the engine used from 1992-1996.
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RE:Did a code check

Subject: RE:Did a code check
by BillH on 2008/1/9 15:24:53

Quote:

Quote:
If you got 3 dashes in 9.7, you cleared it. If you leave the paperclip in and turn the key off, then back on. You should see C-12 first, then it will cycle thru 1.0, 4.0 and 9.0, and should show 3 dashes at each one.

I don't think starting the car is necessary for this particular problem.
Unhooking the battery probably won't change anything but it's worth a shot.

Starting the car wont do anything for it. C12 is only related to the CCM, its got no relation with the other 3 modules.

Hey Case, I'm not sure I understand what you're saying here. C12 is no codes stored in the CCM but if you have a code in any module the C12 won't show up.

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