The voltage was less than 0.1 which led me to believe low resistance.ģ.Performed a volt reference check on DLC pin 2 (serial data) to determine if it was 5 volts and actual voltage was between 1 and 2.Ĥ.Tested DLC pins 4 and 16 (battery) and the voltage was 12.58.ĥ.Checked the purple, black, black/white and orange wires on the back of the DLC for integrity and did not find any issues with fraying or looseness. I performed troubleshooting by doing the following:ġ.Verified that the Power Control Module (PCM) and Data Link Connector (DLC) fuses were okay.Ģ.Tested DLC pins 4 (chassis ground) and 5 (PCM ground). The scanner is operational and can scan all protocols but can not link to any of them. I recently purchased a clone GM Tech2 scanner to access the diagnostics in my 2006 Hummer H2. Recently there is a customer reported the problem OBD2 Port Not Communicating on Tech 2 Scanner,here is the solution for it.
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