I have a 2009 JKU Sahara. When I bought the Jeep it had 3 lights on the dash that were illuminated...I got the dealer to fix it and haven't had a problem since. Before they fixed it though I had gone to Autozone to have the codes read, but the code reader wouldn't recognize that it was plugged in. I told the dealer about it and figured they had corrected it since they cleared the lights and hadn't thought about it again.
The other night I tried using my AEV Procal to recalibrate the speedometer for my 35's. I set the dip switches, turned the key on with the engine off, and plugged in the Procal...nothing.
I don't have a schematic for the Jeep so I'm a little lost on where to start troubleshooting. I'd prefer not to take it to the dealer, but if I have to so be it. Anyone have any tips on where to start? It just seems like the OBD II port isn't interfacing with the vehicle's system. Any help you could provide would be greatly appreciated.