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Q: truck will not start / theft deterrent on on 2007 Chevrolet Silverado 2500 HD

the theft deterrent needs service comes on and truck will not start with either key. unhooked batteries, no good. relearned keys, no good, turned on 10 min off 1 min.x3, no good. is there a recall on the passlock system?
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I cannot find any information regarding recalls or service bulletins on the passlock (Immobilizer) system in your 2007 Chevrolet Silverado 2500 HD. The most common failure with this system is the theft deterrent module which is located near the ignition lock cylinder. Proper diagnoses should be performed before any repairs are attempted.
it seems funny that the ignition switch was replaced, by the dealer, recently. I do wonder if that has anything to do with it? also, for some reason our steering wheel does not lock.
Maybe related, maybe not. It's hard to say. However, GM has a long history of issues with their passlock/immobilizer modules. Not all steering wheels on late model GM vehicles lock, if fact most do not. Did yours lock before?
i don't think so. just noticed it now when i tried to fix the problem with the instructions in the manuel, it says to circle key to lock. i think that means to turn key off and steering is suppose to lock, so that's when i noticed it doesn't. probably never did.
I means to turn the ignition to the "lock" position of the ignition lock cylinder. The lock position is the point of rotation where you can remove the key. I some cases you can rotate the ignition to an "off" position one click before the lock position. As you have noted, the lock position of the ignition switch no longer locks the steering column.
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