P0629 on a 1995 Buick Lesabre
#1
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
#5
Senior Member
True Car Nut
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.
Do this three times and it relearns the module.. After that the car MAY start.
#7
Retired
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.
__________________
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
Thread
Thread Starter
Forum
Replies
Last Post
killer_cr80r
General GM Chat
27
10-26-2019 07:21 AM
james.vogelpohl92
Performance, Brainstorming & Tuning
1
01-12-2012 04:21 PM