2007 Acura TL
Bottom of main catalytic converter heat shield came off about 4 weeks ago. Before I had a chance to fix it, car ended up with P0685 ecm/pcm relay circuit open code.

Wondering if extra heat from cat combined with 95 degree day yesterday caused problem. In reading through other posts on P0685 some have noticed tripping error code on really hot days. 5 year old battery died yesterday and got new one. Im keeping battery disconnected until I can change out relays. Any thoughts