Lost key

ANTHONY.

MEMBER
2005 BUICK LA CROSSE
V6
AUTOMATIC
110,000 MILES

I've lost my key. Can I just replace the ignition switch or do I have to replace the key cylinder?

Wednesday, March 20th, 2019 AT 7:50 PM

3 Replies

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello,

You will have to have another key cut either at the dealership or at a locksmith shop. The reason why, is that your vehicle uses a chipped key to start it. I believe that General Motors uses resistance in the circuit to get to a final voltage, and if the Power-train Control Module (PCM) does not receive that exact voltage your vehicle will not start.

Thanks,
Alex
2CarPros

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Wednesday, March 20th, 2019 AT 8:06 PM

ANTHONY.

MEMBER
2 POSTS

Thank you.

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Thursday, March 21st, 2019 AT 7:11 AM

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

Hello

Here are diagrams and instructions to check the ignition key lock tumbler. Get the new unit from the dealer and bring your VIN and proof of ownership and they will code the key for you. Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.

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