Check engine light, p0402 [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: Check engine light, p0402


KBBrett
01-28-2007, 03:12 PM
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.

bruins499
01-29-2007, 06:49 AM
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.

KBBrett
01-29-2007, 06:20 PM
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,