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Stuck/faulty fuel pump relay or possibly a faulty ECM.
On the driver`s side under the steering wheel to the left
The ECM is located under the right hand side of the instrument panel.
where is the ecm on a 2000 buick lesabre
I do believe on your model the ECM is located under the right hand of the instrument panel. If you really need to remove the ECM I would likely suggest a Haynes repair manual for this operation.
Shorts are what come to mind. Try to follow your wires and check for cuts or bare wires. Good Luck!
I believe the unit inside the air cleaner assembly is the ecm. Electronic control module/ car's computer.
PCM Location where is the ecm or brain in a 95 buick roadmaster
Where is the ecm fuse on a 1994 chevy truck
i donnoe
under the air box
passenger floor