Shifter shows reverse, car does not reverse. P3120?

Hi all, I’ve got my hands on a 2001 Prius that a coworker had sitting for 2+ years after the cat was stolen.

I just repaired the HV battery, but now having trouble getting into reverse. The shifter will go into reverse but the car won’t reverse. Park, drive, neutral and “B” work fine however.

As for codes, I pulled a P3120 and C1259. Also have the triangle of death. Currently looking for my J2534 cable from my Volvo-owning days to set up with techstream to get subcodes, but wanted to see if anyone had any ideas as to what the issue could be.

Thanks!

 

The R does highlight on the dash, but there’s no response from the throttle. I’ll update when I can pull the subcodes.

 

Techstream shows P3120 with info code 240.

 

Actually, some of those other symptoms are present now that you mention it. I’ve never operated a prius before acquiring this vehicle so I’m not familiar with the normal series of events that happen when starting the car.

I haven’t had the ICE start once since I’ve had it, assumed it didn’t kick on until the battery was low or speeds were high enough.
Forward drive does work. Pushing in neutral was pretty difficult, assumed the tires were a little low.

I’ll try turning the crankshaft with a wrench. Maybe the ICE is seized from sitting? If unable to turn with a wrench I’ll pull the spark plugs and put some penetrating oil in there.

 

Thank you for the information and suggestions. I’ll give that a try and report back!