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I have a 2011 Pilot, very well maintained. 171,000 miles on it. Don't ever have issues with it. My husband disconnected the battery to install his subwoofer, reconnected the battery and now we have the ABS, VTM-4, BRAKE light, blinking "D", VSA lights on. We've disconnected the battery to try and reset it with no luck.

Any ideas on what to do next?
The car is showing these codes - U0122-50, 60
 

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Check your wiring to make sure everything was connected correctly especially your ground wires. Perhaps the subwoofer is drawing more power than the factory headunit and amp can handle and the car is acting up.
 

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Those codes indicate loss of communication between the gauge control module and VSC (stability control) module. I think both are under/behind the dash. In any case, I'd retrace and scrutinize all the wiring disturbed during the subwoofer effort, including any wiring that got pinched in a bracket, a ground that didn't get tightened, or a circuit being overloaded (causing low module voltage).
 
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