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I have a 2000 cadillac deville that is not charging. I have…

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HI I have a 2000...
HI I have a 2000 cadillac deville that is not charging. I have been leaning towrds the PCM but 2 mechanics say it is alternator. I removed the alternator twice and both times the shops (2 different) said alternator is good. I have ordered a PCM but scared to insert as I heard it is difficult to reprogram, it was flashed already and supposedly ready to insert. I gave the vin of the car.
Now I have a mechanic that is just jumping everywhere to find the issue. I want to check the alternator out put connected and disconnected to see if the voltage increases. Currently the mechanic has not checked output when not connected to car. I was thinking to remove the red cable at fuse box? then check alternator output? Or I seen here Randall C says check red large lead from alternator for 12 v. then check orange with key off if has 12 volt problemm is most likely the PCM. Would I then just replace the PCM? Where can I get the procedure I heard of to make the security or key be ok? Or did I hear wrong?
Submitted: 8 months ago.Category: Cadillac
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Answered in 1 minute by:
11/16/2017
Cadillac Mechanic: john -aka eauto, The Car Guy replied 8 months ago
john -aka eauto
john -aka eauto, The Car Guy
Category: Cadillac
Satisfied Customers: 17,368
Experience: 15 years as a auto tech
Verified

it needs to be flashed are you buying a programmed pcm?

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Customer reply replied 8 months ago
I bought from all computer resources supposed to be flashed
Customer reply replied 8 months ago
2000 Cadillac Deville ECM ECU PCM Engine ComputerQuality remanufactured units.
Includes all motor sizes.
Free shipping in continental U.S.
Limited Lifetime Warranty w/ Core Exchange.
Flashed with latest GM calibration.
VIN Specific Programming (Plug & Drive).
Customer reply replied 8 months ago
My question is, is there somethings I should check prior to replacing the PCM? What?
Cadillac Mechanic: john -aka eauto, The Car Guy replied 8 months ago

any low voltage or dtc s in the ecm?

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Customer reply replied 8 months ago
HI I have a 2000 cadillac deville that is...
HI I have a 2000 cadillac deville that is not charging. I have been leaning towrds the PCM but 2 mechanics say it is alternator. I removed the alternator twice and both times the shops (2 different) said alternator is good. I have ordered a PCM but scared to insert as I heard it is difficult toreprogram, it was flashed already and supposedly ready to insert. I gave the vin of the car.
Now I have a mechanic that is just jumping everywhere to find the issue. I want to check the alternator out put connected and disconnected to see if the voltage increases. Currently the mechanic has not checked output when not connected to car. I was thinking to remove the red cable at fuse box? then check alternator output? Or I seen here Randall C says check red large lead from alternator for 12 v. then check orange with key off if has 12 volt problemm is most likely the PCM. Would I then just replace the PCM? Where can I get the procedure I heard of to make the security or key be ok? Or did I hear wrong?
Customer reply replied 8 months ago
Note I am not a mechanic, I am an electronic technician
Cadillac Mechanic: David Craig, Auto Mechanic replied 8 months ago
David Craig
David Craig, Auto Mechanic
Category: Cadillac
Satisfied Customers: 5,808
Experience: Owner/Mechanic at 3D Automotive
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Hi Im David, Sounds to me like the PCM is the culprit. Do you need the replacement procedure?

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Cadillac Mechanic: David Craig, Auto Mechanic replied 8 months ago

are you there?

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Cadillac Mechanic: David Craig, Auto Mechanic replied 8 months ago
do you still need assistance? If not it would be nice to let me know. Thank you.
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Customer reply replied 8 months ago
not pcm, started working.
Cadillac Mechanic: David Craig, Auto Mechanic replied 8 months ago

just started working out of the blue?

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Customer reply replied 8 months ago
pretty much while making some test probe tests started working. So the story goes. Thanks anyway.
Cadillac Mechanic: David Craig, Auto Mechanic replied 8 months ago

sounds like somethings loose or a case of terminal fatigue

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