2014 Prius: Check Hybrid System + P2118 after sitting a month

Hi All: I'm in a bind and would appreciate any advice! I have a 2014 Prius that sat for the month of December because I was out of town. When I tired to start it last week, I got the "Check Hybrid System" error on the display. It tries to start but immediately shuts off. The only error code on the reader is P2118.

Here's what I've done so far:

• I tested and charged the 12V battery in the back: I charged with a maintainer and an O'Reilly's test showed it was a good battery. Doors unlock fine, display powers up, so I'm assuming this battery is not the issue.
• I tried jump starting it with another vehicle to no avail.
• I "checked" the ETCS fuse (#18 on my model diagram) in the engine compartment and it seems fine. Meaning it doesn't look blown, so I'm also assuming it is fine. I will check it with a multimeter tomorrow to verify.

Any thoughts on next steps? For obvious reasons, I would love to avoid towing it to a dealership if possible. Photos of the error code and display error are attached.

 

Update: I verified that the ETCS fuse is okay. So it isn't that.

 

Yes, the dome light works, along with all the electronics. 12V is fully charged. I just tried jumping it again, and no, it is not starting.

 

There are.

Where would I locate the connector to the throttle body? I'll try this next.

 

It did not start or idle when unplugging the throttle body.

 

Update: After thoroughly cleaning throttle body, I tried starting it again without success. Additional codes showed up after the last attempt:
Engine Codes: P0121, P0123, P2118, and P2135. Also battery code: P0A0F.

Given these codes, I'm thinking I need to replace the throttle body entirely. How manageable is that to DIY? Anyone done this before? Anyone think I should try something else first?

Also: I've heard the gas indicator could have been wrong (it has two bars), and it could be out of gas. So putting some additional gas into the tank may be helpful if the car was sitting for a month. Worth a shot, but doubt this will help.

 

I've definitely been relying on the fortune cookie approach.

This is very helpful. Yes, that's exactly what I did. So I'm glad to know I didn't screw something terribly up when cleaning the throttle body.

I found the 7 pages in the repair manual, but they all require the Techstream equipment, which I don't have unfortunately.

 

Thanks! Yes— I was able to clean the throttle body effectively, and I also "sumped" what I could. Unfortunately, it still did not start.

 

Thanks, hopefully it will not come to this.

 

After attempting a number of remedies, it is still not starting. I obviously want to avoid draining the hybrid battery further, so my options are limited at this point. Short of replacing the throttle body and praying, I think I may have to just give up and tow it to the dealer, which is the last thing I want to do. Any final advice?