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Discussion Starter · #1 ·
Hello everyone,
This afternoon my truck had been idling for about an hour while I was doing some chores and it set a P0402 , egr excessive flow code. Evidently my TECH II is having issues because it would not communicate, so I pulled codes with my EFI live V2. This truck only has 4K miles,so I am kinda surprised. I can't find much info on this ,so I am just curious if anyone else has had this issue. Oh, and this truck ahs not been tuned. I have been waiting to get some miles on it first and work out any bugs such as this. Thanks.
 

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Stupid question..... are you using a CANdi Module with your tech 2. Cause if your not you should not be able to communicate with a 06.
 

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Discussion Starter · #3 ·
Yes, I have the candi module. I went in to my GMC dealer today adn with a little troubleshooting we found I ahve a bad VCI module in my Tech II,
 
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