Master Warning, ASC, Hybrid System Warning light on 2007 Prius

Did all your warning lights go off? Mine did. I was driving on the highway and pretty much every warning light went off. It was like the space shuttle crashing back to Earth. Freaked me out. Cruise control stopped working also. But I was able to get home safely. I found similar posts on Priuschat, saying that it's probably the inverter coolant system failing. So first, I tried AAA just to see if the guy would know something, but it was way over his head. He did notice my aux battery was failing, but not much else. Then I found a service online that comes to your place to do the work, and they sent a guy out on a Saturday for $70 and he read the codes, and did a full visual inspection, and yes, something was up with the cooling system. He suggested I have the dealer look at it because flushing the system is VERY important apparently. Should be done every 50,000 miles. I had no idea. I was so worried it was the hybrid battery; we all know what that means! So I had the car towed to the dealer (don't drive if your Master/Hybrid light comes on!) and they said, indeed, the pump was gone. And, of course, they found a number of other things included the dying aux battery. It took them 4 days to get the damn part in stock. At least they covered the car rental for me. Fixing both was $600. They also said I need spark plugs and something to do with the fan ( don't have it in front of me). But I will the online service do a quote as well. Not to be shill or anything, but my first experience with them was great since they came out on weekend, and it was half the price of having the dealer run the codes. And it gave me the info I needed to take to the dealer so I wasn't going in blind. They come to your place and do the service there. I highly recommend it for basic stuff. And they were honest enough to tell me to take it to the dealer for the repair. Also got $10 off next service. Dealing with car repair is SUCH a hassle; it's about time something like this existed. Message me if you want the name. Anyway, shout outs to Priuschat also for cluing me in to the issue!

 

Yes, it was the pump. Appears to happen to a lot of people with an older Prius.