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2000 Buick Century custom, 3.1L, replaced PCM that was

2000 Buick Century custom...

2000 Buick Century custom, 3.1L, replaced PCM that was pre-flashed. Security relearn done, no security light but says needs crankshaft position sensor relearn. All lights come on but when I turn the key everything shuts off power, no radio no lights no nothing. No crank no start no power until I release the key. Seems like security is still active but doesn’t say so. Could the relearn cause that or am I missing something.

Mechanic's Assistant: Is the security light blinking or flashing, or is it solid? When did you first notice it?

Security light is off

Mechanic's Assistant: What's the approximate mileage on your 2000 Buick Century?

139147

Mechanic's Assistant: Is there anything else the Buick Buick Century Mechanic should know before I connect you? Rest assured that they'll be able to help you.

Blue streak reman PCM and was flashed from them with the Vin, mileage and old pcm number

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Answered in 15 minutes by:
6/25/2022
Buick Mechanic: J Hall, ASE Certified Technician replied 1 month ago
J Hall
J Hall, ASE Certified Technician
Category: Buick
Satisfied Customers: 2,262
Experience: Auto Instructor at Universal Technical Institute
Verified
Hello, my name is ***** ***** I will be glad to try and assist you with this no power concern.  Can you tell me, please, exactly why you replaced the PCM?  And I would also like to know if you can tell me how old the battery is, please?
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Customer reply replied 1 month ago
PCM replaced because of random engine misfire That occasionally showed on cylinder 1. Replaced everything including injector. Still a problem. Replaced PCM with new one and new code for the Crankshaft position sensor relearn shows up. Cant start the car to tell you if it fixes the issue. But I can put old Ecm in and starts right upBattery is new
Buick Mechanic: J Hall, ASE Certified Technician replied 1 month ago

So, it appears that the problem you are having is with the new PCM.  I can only suggest you contact the people you bought it from and have them make it right.

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Customer reply replied 1 month ago
As far as I can tell there is no chip in my pcm. Can you think of anything else that would stop pcm from firing the engine? It unlocked the security so I know it's not the keyWould the crankshaft position relearn needed shut it down like that?
Buick Mechanic: J Hall, ASE Certified Technician replied 1 month ago

The problem is obviously something within the new PCM.  I really can't tell you anything more than that.  The company that sold that unit to you will have to explain it.  Since you can't perform a crank sensor relearn, that would not be your issue.  The new PCM is your issue.  Contact the company you bought it from and talk to them about it.

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Customer reply replied 1 month ago
Ok that's what I thought, thanks for your time. Just needed a second opinion
Buick Mechanic: J Hall, ASE Certified Technician replied 1 month ago

It has been my pleasure.  I'm sure they have a decent customer service department that can help you with this issue.  Good luck.  And thanks for using JustAnswer.

J Hall
J Hall, ASE Certified Technician
Category: Buick
Satisfied Customers: 2,262
Experience: Auto Instructor at Universal Technical Institute
Verified
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