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Old 09-10-2014, 09:43 AM   #1
Scooby Newbie
Member#: 325507
Join Date: Jul 2012
Chapter/Region: NESIC
2010 Impreza 2.5 OBS
2 tone silver

Default U0073 - 2010 Impreza Help!

Car: 2010 Impreza Outback Sport - 5 speed manual. All stock

I've been using PLX Kiwi Bluetooth (OBDII Reader) with Torque PRO for more than a year without any issues. Two nights ago I forgot to turn off the OBDII reader overnight so my tablet in my car with Torque PRO was trying to connect to my car overnight.

Started my car yesterday morning, have CEL/TEMP/Cruise/ABS lights go off - car appears to be in limp mode. Use OBDII error code reader and get U0073 - Control Module Communication Bus A off. Google it online and it appears to be a common code when Torque tries to read which protocol to use during car start up. People say to just clear ECU/unplug OBDII reader/restart and problem should go away.

I was late for work so I did NOT reset and drove to work. All lights on but car is working fine. After work I clear ECU/shut off engine. Try to restart and the engine is not starting up. Try again and engine starts up with rough idle. Try to get moving, car bogs down and almost stalls so I give it more gas. Move a few hundred feet. Power steering goes/power breaks go/car stalls. Read code U0073. Car will not start. Clear ECU. Car doesnt start on first try.

Then car starts. I don't have full power back but its better than before (about 90% of power back). No CEL light. But the issue is when I need to stop and go into neutral and apply brakes my RPMs drop to 300-400 and car almost stalls and power steering starts going. Then RPMs jump back to 700 and everything is fine until next time I try to apply the brakes.

I currently don't have CEL BUT when I read with OBDII and Torque it throws historic code U0073. Please HELP!
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