How to fix the U0168 Code on a 2007 Toyota Camry Hybrid?

[yamoffathoo]

I was investigating why the A/C System was not cooling and performed the following test after measuring no connectivity between any of the HP sensor pins, 5V on two of the A21 sensor connector pins and 28 psig at the LP A/C port:

- Turned the A/C switch on with blowers on high and temperature on low
- Connected four 1.5V batteries in series with +ve to terminal 3 and -ve to terminal 1

The A/C blower and indicator lights immediately stopped functioning
The Main and Sub fans both began spinning.
Removed the testing rig and replaced the A21 sensor connector
Powered OFF/ON

No A/C blower or indicator lights
Main and Sub fans both spinning
U0168 Code detected - no others.

My mistake was imposing 6V instead of <5V across the A21 sensor (per attached).
Is there a way of recovering from this error?

 

[yamoffathoo]

I will check the pins for power tomorrow.
I reached out to the local Toyota Dealer for a cost estimate to diagnose the HVAC module (reply attached).

If you are correct about "how could the control module respond over the network with a code that it can't communicate, if it can't communicate?", do you think his suggestion of purchasing a replacement is futile?