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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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14 hours ago, BodybyFisher said:

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 

Uh, like BBF needs anyone to back him up, but as an outsider in this thread I do think I have something that might help out here.

Whenever the battery voltage drops below 9 Volts during cranking (or any other time, like sitting at a long light at night with the headlights and A/C running...), some modules will start throwing bogus codes.  At least two of them will throw "Battery voltage low" codes to make sure the tech knows to ignore ALL the codes, charge or replace the battery (or fix bad connections), clear all the codes, and start over.

Things that can cause voltage to the modules to drop below 9 Volts when the battery is new:

  • Wrong battery -- too small, or one with not enough cranking power; or an ordinary battery when the car is designed for an AGM battery
  • Corrosion on either battery cable connections to the battery
  • Bad battery ground on either the engine block or on the car body
  • Dragging starter or something on engine dragging or seized
  • Battery too cold to start engine easily, particularly while engine is dragging due to extreme cold
  • Engine taking far too long to start for any reason
  • Bad connection or cracked Maxifuse or fuse
  • Bad ground on module(s)

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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On 2/26/2020 at 3:59 PM, Cadillac Jim said:

BBF, next time you get in a tight spot and need an FSM for 2002-2012, send me a PM (I'll get an email).

Thank you, Jim


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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