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How to Replace Ignition Lock Cylinder and Housing 2003 Chevy Silverado C1500 Pickup with Passlock Security Light On...

Ignition Lock Cylinder Replacement (late model GM Trucks)

My 2003 Chevrolet Silverado C1500 Pickup has a worn lock cylinder housing. The key cylinder has been replaced with a new key, and a new lock cylinder housing installed. When I reassembled everything, the car started but quickly died when the key was released to the "run" postion. Also, the Passlock Security Light (amber colored car with lock light) on the dash or instrument cluster stayed on when the ignition switch was turned on.

What do you think is wrong with my car?


I spoke with a local GM service technician in my town and he suggested the following fix to solve this problem...
The "car with lock" light on the dash indicates a failure with the ignition lock cylinder/passlock sensor assembly. However, before replacing the sensor assembly, you should initiate the security relearn procedure to see if this solves the problem...

First disconnect battery for 10 minutes, then reconnect the battery and perform the folowing procedures: 

1. Bump the key in "start" position for a second, then
2. Leave the key in the "on" position for 10 minutes, then
3. Turn the key "off" for 5 seconds, then 
5. Turn the key "on" for 10 minutes, then 
6. Turn the key "off" for 5 seconds, then 
7. Turn the key "on" for 10 minutes, and then
8. Start the engine.

"Oh my goodness, when I turned the key to "start" in step 8, the "double lock" light went "off and the engine started and continued to run. 

The problem was fixed and I was extremely happy. One thing for sure I've learned, you're not going to be able to fix modern-day  cars without equiping yourself with knowledge and information. The expensive Mitchell, Alldata, and etc manuals are excellent for shop references, but all the "do it yourself (diy)" auto mechanic needs is a top rated Google search engine and a few Youtube videos. It so easy! 


GM Passlock Security Light Flashes - Quick Fix (Temporary)
Passlock System Fault Code - B2960 Security Light Flashing
Problem: Engine starts and dies

If you find yourself stranded with this probem and your engine won't start, and the security light is flashing - here's what you should do...

1. Leave the key on and wait for ten minutes - the flashing light should go off or illuminate without flashing
2. When it does, turn the ignition off, then
3. wait twenty seconds, and then 
4. Try to start the engine - it should start and run.

This procedure is a temporary fix to get you home if you are stranded, however the fault stays in memory and will probably happen again. The standard repair procedure is to replace the ignition lock cylinder and/or Passlock sensor and perform a relearn procedure.

The Passlock relearn procedure is required with replacement of the following components: the ignition lock cylinder, the Powertrain Control Module (PCM), Body Control Module (BCM), or Instrument Panel Cluster (IPC).


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