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To do self diag on a pt u need to start with ignition off. Hold trip button in for the odometer keeping trip button held down turn ignition key to run then release trip. This will also run a self test on instrument cluster. Codes will be displayed in the odometer at the end of test
Could be a bad ignition lock cylinder, or could be the cable that goes from the shift lever to the steering column. If key won't turn at all it's probably the lock cylinder. If it turns forward but not back all the way the probably the cable. Hope that helps.
Remove the shroud cover, and the plastic ring around the lock cylinder.WD-40 the lock cylinder, Put the key in the ignition. Rap(Hard) on the back of the key while try to turn key. If it turns leave it in the ON(not run)and I'll tell you how to remove the cylinder.(If You need). The cylinder NEEDS to be replaced.
Is your theft light flashing. If it is try this. I learned this from emission wiz
Put your key in turn it on dont start wait 10 mins remove key wait 10 seconds repeat this a total of 3 times. If that dont work try a different key do the same thing. This relearns your key to the ignition it started with Gm cars and trucks from 1999 to to 2006. It is a big problem but there is no recall that I know of. If that dont work a dealer needs to probably replace and reprogram your ignition switch and keys
When you put the key in the ignition, try giving it a few good taps right on top of they key. That usually does the trick for me. Also, always be sure the wheels are straight before turning off the ignition. For some reason, parking with the wheels turned often causes this lockup problem for me. It can be a pain, but just keep tapping and it should unlock.
THe tumblers in the ignition cylinder are probably worn therefore won't alow you to turn the key. Try inserting the key and jiggle it around while you are trying to start it. Sometimes it will work.
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