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Discussion Starter #1
I'm currently tracking down why there are DTCs of the U1xxx variety because it seems to be due to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE.
In the GM Service Manual, recommended TESTS are divided into TWO DIFFERENT TESTS depending on whether or not the vehicle is equipped WITH or WITHOUT IMMOBILIZER.
* How do I determine if this vehicle is equipped with an Immobilizer
 

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2002 chevy trailblazer_lt
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I cannot answer the immobilizer question directly. I can only say I have read in another website where a well known member stated that all these trucks have immobilizers. That left me wondering why the schematics I have seen show with and without?

A related question....if your scan tool doesn't communicate with class 2 device how did you come up with the U1xxx codes? Is it that you can connect to some of the modules and not others?

With a more complete explanation of the issue I may have more concrete suggestions.
 

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UPDATE / FYI -- I have been told by my local Chevy Dealer that if the Car Key does NOT have a CHIP in it - the vehicle does NOT have the IMMOBILIZER.

* I'm going with that.

Stay Safe, everyone..... WEAR A MASK and protect YOUR LOVED ONES!
 
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