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P3030:Toyota Prius code P3030 “High Voltage Line Snapped” - Luscious Garage | Hybrid Specialists

You may be able to repair the harness, I think I'd just replace it. And the Buss bars.

 

Tucson is still hotter than. . . 106 today, 107 tomorrow. Still great places for food, too All it really needs is a lake that's close. I'm jealous of where you live!

I can only speculate about why your car won't start. I think that the computer won't allow the IC to start because it's reading a bad HV battery. These cars have a lot of self defense built into the computer systems. Quite often fault codes cascade, one DTC causes others to set. Fix the primary one and the others resolve.

My first Gen 1 had corrosion on the buss bars. Previous owner ( retired mechanic) had it towed home, cleaned the buss bars, got it running, and swapped it to me (for a Ram pickup.) The car wouldn't start with the bad buss bars. That's why I suggest cleaning or replacing the buss bars in addition to the new harness.

 

Sense harness problems generally don't cause the car not to start, unless there's a multiplicity of breaks in the harness.

I had the same problem on my Daughter's 2002 Prius. Three times in 4 years the HB Battery sense connector broke. I'd take a few hours to remove the battery, solder the connector (It usually breaks above the crimp) and reinstall the battery.

Then, I decided she needed to spend a little money and we purchased the harness from a Toyota dealer. IMHO, it was money well spent. I figure it will take a couple more years for that harness to start showing it's age and have problems. So far, so good.

 

That's not good. Hold off on buying that new harness.

Let's talk a little backstory. How many miles? It didn't start when you bought it? What kind of shape is the car in; rusty? paint? body? interior? How are the tires? How much did you pay? Can you afford to potentially put a couple of grand into it? & are you inclined to do so?

I'm thinking that your HV battery is bad. Probably the PO ran the battery down and then let it sit. Not good. If it were mine, I'd probably put the grid charger on it. But that's about $400 to buy.

You need to decide whether you want to cut your losses or fix it. Sorry.

 

This. And, will this car need to be reliable transportation or just a project? If the former, you're going to need a new battery.

GOOD LUCK!

 

Well, it sounds like you'll end up with a very low mi. car for about $3 grand. My "bring a tow dolly" car had about 200,000 mi. on it, but I only paid $400. Mine had an almost new Toyota battery, but a lot more miles. Sounds like your's is a candidate for whatever you decide to do. They are incredibly nice little cars, btw. Post some pics when you get a chance.

 

Check also the thread "Battery Fires at ECU Sense Plug" in this forum... while flat cells (dead HV pack) is possible (likely?), the OTHER end of the sense wires is beginning to show signs of decay in the fleet. If you can find a buddy with a GenI prius, a swap-the-HV-pack afternoon may help to determine whether your HV pack is the issue or not. Then it becomes a dollar decision, not a knowledge decision.

Do keep us posted; we're rooting for you to find a winner with this car!

 

Oh man I know right! Took me 2 weeks to do a 3 cycle recondition all the cells on my 2nd gen
Your 1st gen looks amazing btw!