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That happens when the battery is weak, false codes will set as you can see by the low voltage.

The car needs a strong battery of proper CCA or Cold Cranking Amps.  A weak battery will set codes as the modules will no have adequate voltage to properly start up


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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3 hours ago, Kingcadillac said:

Batterys brand new. 

It was you who made these 2 statements:

Brand new battery but for some reason my battery terminals get corroded fast and it slooooowly drops charge not lose charge but drops to like 11.7-11.9 

Eversince than its like my battery has acted funny. I would like to test my alternator 

A WEAK BATTERY OR ANY DIFFICULTY WITH POWER DELIVERY WILL SET FALSE CODES 


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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