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1998 c 1500 wt problem with pass lock

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Old 10-28-2018, 08:22 AM
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Default 1998 c 1500 wt problem with pass lock

I think I have a problem with the pass lock system . When it first became a problem you would go to start it and it would imediatally stall out , no power to the fuel pump. Let it sit for 10 minutes and it would start no problem . It got worse over time . I now have to disconnect the battery ground for 10 minutes then reconnect wait a few more minutes then it would start . the last week I takes three or four tries like I mentioned above before it starts. Once its running it will be fine for 3 -4 days , sometimes 2 weeks. When I take it to the dealer and leave it it never seems to do it , they say they can't find the problem unless it fails to start when the have it . This has been going on for the two years I have owned it . I bought it with 62k on it it now has 92k. I used to think I was resetting the computer each time I disconnected the the ground cable but not sure any more . the key does not have a chip built in it like some. I replaced the cylinder and key and also the cylinder case . I was told the presence of a key sends a code to allow the truck to start . any help would be great.thanks
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Old 10-28-2018, 10:30 AM
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Not sure what you mean by cylinder case....do you mean the PassLock sensor?

When you say dealer, are we talking a GM Dealership? If yes, did they replace the key, lock cylinder, and case?

Yes, the vehicle may have started every time for them, but did they scan for "B" codes as well as "P" codes?

If the key, cylinder and case(Passlock sensor?) were replaced by a GM Dealership, this pisses me off......should be able to fix their own cars....

The connections between the PassLock sensor and the EVO/Passlock module should have been checked first.......the other possibility is the EVO/Passlock module....

When the vehicle doesn't start, if you do not do those procedures you try, will it continue not to start? If yes, then unfortunately, what may need to be done is have the vehicle towed to the GM shop when it won't start, and have them attempt to start the vehicle while having a Tech II connected to see if the Passlock signal is getting to the EVO, and then from there to the VCM....

Basically what happens is, the PassLock sensor sends a signal to the EVO, and it in turn sends a signal to the VCM....without this signal, the VCM will stop firing the injectors......that is why you have an initial start and then it dies....
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Old 10-30-2018, 06:16 PM
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Thanks for the help,. I had it towed to the dealer Sunday because it wouldn't start. I went there today and there are too busy to look at it so I went and tried to start the truck and it started first try. Could the ing.module you mentioned work intermittently ?
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