my 2001 pt cruiser quite while driving it, two deer,s jump out in front of me an

Hello, P0340 as a hard fault would indicate some kind of electrical short in the circuit. This code typically comes on when the vehicle stalls due to loss of sensor signal -- not as a result of any fault. However, if the code does not clear, there is a "hard fault" from an active problem with the circuit. Troubleshooting is needed. Even so, you still do not know what is going on - no spark? No fuel? No air? Timing off? No compression? Hands on testing is needed, and not just "codes".

What is the significance of the two deer jumping out in front of you? Did the vehicle strike the deer then all this happened?