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Old 06-11-2013, 05:23 PM   #1
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Default P0629 on a 1995 Buick Lesabre

Hey guys i really need help with this 1995 buick lesabre i have replaced the ignition switch with a new key with the chip that matched the old one. It is still coming up th P0629 pass key frequency invalid i dont know what else to check it starts like for one second and then it turns off. I was thinking the decoder module but dont know i really need help. thanks
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Old 06-11-2013, 05:28 PM   #2
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Old 06-11-2013, 05:43 PM   #3
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i allready tried that and it didnt work but now with the new switch and key theres no need for that
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Old 06-11-2013, 05:52 PM   #4
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Perhaps the VATS module has failed. This is the device that read the resistance on the chip on the key.
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Old 06-11-2013, 05:56 PM   #5
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Under some conditions the vats module has to relearn the key.. This is done by turning the key to the on position and wait until the security/theft light goes out.
Do this three times and it relearns the module.. After that the car MAY start.
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Old 06-11-2013, 06:19 PM   #6
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ive tried relearning it too and it didnt work i really think its the decoder module but i cant find a way to test it if its that
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Old 06-11-2013, 08:28 PM   #7
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Someone on here used a Multimeter that had the capability to insert a 50hz signal via the probe on the PCM side of the car and was able to start the vehicle. But I don't remember who or what though.
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