2004 Maxima SL: U1001 and P0462

I have a 2004 Maxima SL, about 144,000 miles on it. I'm the original owner. Well maintained in terms of regular servicing.

Went to start the car this morning, and out of nowhere found:

Instrument Cluster problems:

Tachometer - stays at 0
Transmission Indicator - blank; no LED showing at all
Fuel: stays at 0, low tank warning light is on
Temperature: stays at the bottom
Cruise Control won't turn on
Climate Control won't turn on

Following lights are on, steady and not blinking:
Slip
VDC OFF
ABS

I have Torque with an OBDII device plugged in, and found the following:

Fault Codes:
U1001
P0462

Mode $06 report generated by Torque for Android:
All tests pass except for:

TID:$46 CID:$0e
-
Max: 296
Test result value: 368
FAIL


I am good with computers and technology, but virtually no skills or tools for auto repair. I can follow instructions and sort things out, if there's a straightforward fix I can try.

Any idea on what the problem is, and more importantly, is this something that I can potentially address myself? The searching I've done spoke of a poor ground somewhere. The battery terminals are clean, and free of corrosion, for whatever that's worth.

And is this something a non-Nissan repair shop can deal with? Ideas on cost?

Thanks for any insight and/or suggestions.

Don

P.S. Is it safe to drive in this condition, such as to get it to the shop?