61-01 Battery Voltage Malfunction

This code 4Times P0420 Catalyst System Efficiency Below Threshold Bank 1

83-01 Engine Control Module (ECM)/Powertrain ControlModule (PCM) Relation Malfunction

86-01 Controller Area Network Relation Malfunction

I was wondering if anyone could tell me the fixes to correct these code?

 

2005 Acura TL (sorry)

 

I would look at the battery voltage malfunction first as weird spikes and anomalies in the power system can throw odd codes. Have you removed/replaced your battery lately? Have you messed with any electrical things lately? Just undo the negative battery terminal for a few minutes and plug it back in. This will reset the ECU and clear the codes. If they come back, then diagnose further.

 

I replaced the battery last month though.

 

did you test the alternator?

 

Alternator is good

 

Check your terminals, Might be cruddy or lose. Had this happen to me all kinds of crazy codes battery and alternator were good, ended up being loose Terminals...