Pass-code

1997 CHEVROLET CAVALIER

99,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC

THBTGOLD

MEMBER
2 POSTS

I have a new key cylinder and I have tried to get it to relearn postcode. no luck. I have tried quite a few methods from the forum, no luck. is there any other methods? I could really use some help. have been working a day and half on it now.

Feb 1, 2018 at 6:18 AM

STEVE W.

✓Experienced Mechanic
15,349 POSTS

That car is equipped with the pass-lock system. Changing the key cylinder will not repair it if the security system is the problem. The normal failure is the actual sensor in the housing. The key cylinder only has a magnet that passes the sensor.
To repair it you need to change the actual lock cylinder housing (easier way is to get a different column from a vehicle that ran) then re-program the security module to accept the new coding. You also need the dealers access to get the programming software to access the security section of the PCM.

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Mar 22, 2021 at 10:58 AM

THBTGOLD

MEMBER
2 POSTS

Thanks Steve.

Mar 22, 2021 at 10:58 AM

STEVE W.

✓Experienced Mechanic
15,349 POSTS

You are welcome. Sorry it is not better news. That system has been an issue from day one. The earlier passkey systems and later transponder units had easy to replace parts. The pass-lock system though, they decided to make the sensor part of the housing. Was not a good idea, especially with the failure rate they have.

Mar 22, 2021 at 10:58 AM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.