9 Pin Data Link issue

[Chamberpains]

And just to throw it out there 1 more time. Maybe pull the weather packing out of the back of your connectors and make sure all your wires for the diagnostic port are good. I just had this happen with my latest truck. The mileage wouldn't record on my ELD which then wouldn't allow the ELD to track the driving updates every hour. It would only update mileage when I stopped and changed duty status. EVERYTHING else on the ELD would record and function properly.

Fast forward after hrs of diag and resetting and uninstall/reinstall and updating and being on the phone jumping through ELD manufacturers diag crap... I pulled the weatherpack out for the hell of it and there was a wire holding on by a strand of copper. Fixed that and that fixed everything with the ELD.