Originally Posted by
NJ_Phil
Mike.. this might be off topic a little but I have the 30-0311 and 30-0333 OBDII gauges mounted in a piller. I could never download a tune using HPT or reliably scan when both gauges were connected to the CAN. Tried short daisy chaining the CAN signals from one gauge to the other within the pillar and running a single cable to the port under the dash, tried separate cables to the port, shielded them, ran twisted pairs....nothing helps. I had to add a switch to break 12v power to the 30-0311 which works but that shuts down the gauge when connected to HPT. Signals look clean on the scope so it does not look like noise to me.
I also purchased the 30-0311 the week AEM released it so not sure if there's a firmware upgrade to help this, along with making more PIDs available for display. Tech support said if a PID isn't displayed, then it's not available from OBD but I find it hard to believe simple ECT is not available. It's a late model (2012) E38 ECM
Any advice would be appreciated
Thanks