Question about Vehicle Parts & Accessories
Engine starts but won't run because of passlock II not functioning right.
Is there an easy fix or shood I try a (bypass). I really don't have the $160.00 to $200.00 to pay a Dealer for 5min. of time. Can you help?
Turn key to start position for 10 minutes and it will reset passlock
Or, once you're tired of being stranded for 10 min every 6 weeks or so, try the following:
Here's the "fix" I did for my 99 tahoe. Took the cover off the steering column, unplugged the sensor from the cylinder *while* the car was running. it's a 3 wire plug red w/ white, orange w/black and yellow. From then on, the car will always start and ignore the sensor. The only negative is the security light stays on. Replacing the BCM only postpones it from happening again if the problem is the resistance in the ignition lock cylinder. Check out the following links. Good luck.
Posted on Mar 18, 2009
I hate no say it, but it sounds like the passlock computer is bad or going bad. A bypass wold work, but you need to read a value. Even hough the auto learning one are easy, there is no guarentee that it would solve your problem. When you put the key in ignition, turn it on (not to crank) dos the security light start flashing? If so, you need to either wait 15 minutes or wait with the key oon until it stops flashing. Once it stops flashing, try to start again. You should get to try it 2 times before the passlock will lock up again.
Did the problem just start? I put a start in a 99 tahoe, and the guy SWORE that it was my start causing the problem. Si, I took it out and it turned out to be either his key cylinder or the passlock computer.
Sorry for the bad news. Hope this helped just a bit.
Winona Lake, IN
Posted on Jan 28, 2009
I have tried cleaning the contacts on the fuse for that system, it seems to be working for now. It has been an intermittent problem for years. New fuel pumps, etc., but thought I'd try this basic step. Also read that the contacts on the fuel pump relay may need cleaning, but that didn't help in my case.
Posted on Oct 09, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
The ignition switch
The passlock sensor
The EVO/Passlock module
The security indicator
The vehicle/powertrain control module (VCM/PCM)
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