Prius (2004-09) :: Warning Lights On / Code U0100 - ICE Does Not Fire Up
Apr 23, 2013
Driving home today, my prius threw the triangle and all the other warning lights. Scanned with my scan gauge got code u0100. I was only a mile from home so attempted to drive it. Car made it 1/4 mile and then died. I had it towed to the house and checked the grounding wires going to the engine and transaxle. The Tranaxle grounding wire was loose so i pushed it together tightly. The car now runs on main battery only, the ICE does not fire up. All warning lights are still present. Nav screen says problem. 12v is good.
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My 2004 gen II died on the road last week. I wanted to have information, on what is apparently a rare problem.
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I bought an '04 prius about a month ago and it has already been at Toyota for over a week. It get's the red triangle, the yellow brake light, and the hybrid red car on the screen and says Problem! I took it to the dealer and he pulled the codes P3009 and info code 526. When you open the hood, the inverter overflow tank is boiling, so it must be overheating. I have read about the pumps going out and when the engine is cool there is turbulence in the overflow tank.
The guy I bought it from did say he had replaced the water pump recently. Toyota kept it for a week trying to replicate and couldn't, and even had the regional rep look at it.
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Bunch of warning lights appeared and the dealer said it's code P0a80 and they recommend replacing the battery. I'd like to try to fix this myself and would like to hear your thoughts...
Plan is to check the traction battery for corrosion and use a voltmeter to test the cells and replace if needed. Prius 2004, 158,000.
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I keep getting the C1344 and all the lights. I checked and changed the rear shoes and the light keeps coming back, although not immediately. It takes just a little while.
I didn't notice any signs of leaking fluid, though I was able to squeeze the LH wheel cylinder in pretty easily by squeezing on the top of the shoes. The drums were not scored and were in spec so I didn't turn them. I never cracked any brake lines loose.
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I have a 2008 Aurion (NZ/AU version of the Camry V6), and I am frequently getting the Check VSC warning on the dash. So then I bought a bluetooth OBD2 adapter, plugged it in and it returned the error codes U0100 and U0101 which is apparently a network issue though I don't know exactly what that pertains to.
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After running to operating temp, if the car is turned off then restarted (like you would at a gas station, which is where I notice this) the engine will turn and turn and turn but not fire. I have noticed that stomping on the acceleration will cough it into life during this procedure. This doesn't happen every time and I have recently run high octane gas during a long distance trip.
106K miles...
Recent p0441 fault codes and gas cap warning light...
No other problems or codes...
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My 2007 Prius with 176k had the warning lights on the dash. I finally got the code read and it is the P0A80 code. The 12 volt battery seems good, it is about a year and a half old or so. That was the only code.
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Gen II Prius, 151000 miles, HV battery died (rapid charging / discharging, cooling fan on high constantly, etc) Installed remanufactured HV battery. Connect it all back up, test drive, get the triangle of death, VSC, amber (!), and MIL on MFD. Car continues to drive normally until shutdown, upon next startup lights still present and won't shift into D or R only N. Pull codes, POAA6 is showing.
Code doesn't reset with car in ign on (not ready) after 60 seconds, make car ready and shift immediately to N. Code resets after 30 sec. Have done this trouble shooting 4 times and code always resets with ready on and in N. This points to the HV 'leak' being either in the wiring harness or the inverter. What I can do next in order to figure out which one?
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Fault code (U0100 lost comm with ECM/PCM)
Car started a few weeks back. I let is sit while I ordered a new dash, it had a blow dash airbag.
I replaced the dash, taking out the stereo and instrument cluster. I also replaced the battery with a new factory one.
Went to start the car and nothing happened, no cranking, the only thing I can hear is a single click from the starter. All the lights are on in the instrument panel.
Windows, sunroof don't work even in AUX power. Fuel pump does not prime
I searched the forums and tried numerous advice, but to no avail.
I checked the fuses, none were blown, checked the relays, all work.
OBDII reader throws out the code U0100 even though check engine light is not on. I dont have VAGCOM or VCDS but should in a few days.
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I actually just bought a used 2004 Prius with 207,011 miles on it from out of state. I had a car shipped to me by a flatbed trailer. I just got the car the last weekend. However, It has a yellow engine light and a big red triangle with an exclamation mark (!) on a dashboard, and a red car with ! on top left of a display screen.
I drove it to a DMV to get it registered and took it to Pep Boys near my place since I have to get it an emission inspection within 10 days of registration anyways.
They ran a diagnostic test and found 2 current error codes (C2310-open/short in battery circuit & C2318-low voltage error) and 1 history code (P0A80-hybrid battery pack needs replaced), so they didn’t perform the inspection; otherwise, it would have a failed record). They told me that the car has had problems before and the problems are about a hybrid transaxle and a hybrid battery pack. They also told me that I need to visit a Toyota dealer to get them fixed in order to pass the inspection, and they warned me that is going to cost me a large four digit probably . So, they suggested me to just trade it in because it is not worth repairing. They also told me that a dealer who sold me the car probably would have done something to the car, that’s why it didn’t illuminate any warning lights before.
I tried to gather as much information as I could, so I asked the shipper if he noticed any warning lights but he didn’t think so; one thing he noticed was the hybrid battery isn’t charged because the engine started every time he moved the car.
I plan to take a car to another auto shop near my place as well in order to have them double check the issues and give me a repair estimate before taking a long trip to Toyota dealer.
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I had just picked my kid up from school, as I turn out of the parking lot my A/C stops blowing cool air, I check the A/C screen and it still says it's set on High with temp at 68. However, it is blowing very low with warm air. Seconds later the dash lights up with numerous warning lights. I'm on the highway and I'm able to gather speed, but each time I do I hear the engine revving like crazy. We only live a few miles from the school so I am able to make it home. Once home, I turn off the car and turn it back on. The only warning lights displayed now are the red triangle and the yellow check engine light. I turn the car off, pop the hood, I check the belt and it was fine. I checked the oil and it seemed fine. I check the coolant overflow and it was empty.
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Fault code (U0100 lost comm with ECM/PCM)
Car started a few weeks back. I let is sit while I ordered a new dash, it had a blow dash airbag. I replaced the dash, taking out the stereo and instrument cluster. I also replaced the battery with a new factory one.
Went to start the car and nothing happened, no cranking, the only thing I can hear is a single click from the starter. All the lights are on in the instrument panel.
Windows, sunroof dont work even in AUX power
Fuel pump does not prime
I checked the fuses, none were blown, checked the relays, all work.
OBDII reader throws out the code U0100 even though check engine light is not on. I dont have VAGCOM or VCDS but should in a few days.
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My 2006 prius has the Master warning light(red) and the braking system light (Yellow) on while I am driving, and I went to the dealer.
The technician told me that he could not verify any warning lights ON at that moment, and he performed health and diagnostic checks on it. He inspected connection at auxiliary battery and junction box 1. All checked OK at this time. No repairs recommended at this time.
However, the master warning light came on when I pick up the vehicle. The dealer told me that they will inspect it again tomorrow. And they found that there a P0A08 error code. They suggested me to replace the hybrid converter/inverter.. My car can still drive while the lights ON.
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I have a 2009 Toyota Corolla (It has a 1ZZFE engine). The car for a long time was a little problem when starting (long cranks and several tries before starting, but no check engine light at all), then, after adjusting the PVC hose for 3 days the car worked perfectly, but one week ago, in the morning when trying starting, it was impossible. I scanned and got a U0100 code, tested crankshaft position sensor and it is ok, tried with the other key but same result, only cranks, no start at all. After scanning, it started briefly and suddenly went off, tried again, and only cranks.
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I nearly killed my 12v battery this week when I left my dome light on in the Airport parking lot. When I got back to the car I was able to pop the hatchback, but there wasn't enough juice to start her up. I was able to get a booster pack jump and it looked like everything was fine (didn't even lose the radio presets on the aftermarket deck). I had a long ride home to charge the 12v battery up. I changed out to the Optima yellow-top a couple years ago, so I'm not too worried about the battery being crippled. I've gone into the onboard signal menu and the battery voltage is well within spec idle and under load after a few hours of driving recharge.
Low and behold, the next day the VSC warning light came on and won't go off. I am NOT getting the brake (!), red triangle, or ABS warning light as others have received with 12v battery issues. I put on the OBC scanner and pulled no issues. I jumpered pin 13 TC and 4 Gnd on the interface to get the flash codes and sure enough, I'm getting a 34 code on the VSC system. I have been unable to clear the code via tapping the brakes.
What a VSC 34 is and how to clear it?
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When I turned my Prius on today, the following warning lights remained on:
red "BRAKE"
yellow "ABS"
yellow "VSC"
yellow exclamation mark inside a circle inside parentheses.
It drives fine. After driving it a bit I tried turning the car off and back on a few times. The lights still remain on.
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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.
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 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 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.
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The other night, went to start the prius and nothing happened except all the warning lights came on! So took the foot off the brake pedal and sat there for a minute trying to figure out. What the heck happened?? Tried a couple more times and then suddenly it was fine and it started! Now I have to mention that the outside temp was around 16*,,, not sure if that could have caused this strange reaction?
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I bought a toyota prius 2008 few weeks back. ave done only 2500 km. Today I received few warning lights on the dash of my car.
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Two days ago the first sign of a problem was the AC going out, followed by the red warning triangle and check engine lights coming on about 10 minutes later. Checked coolant and topped oil off (it is due for an oil change, btw) and drove about 20 miles home, no problems despite warning lights. Even the AC started working again. A little while after getting home, I started it up......no warning lights. I thought all was good.
Yesterday, no issues. Didn't drive more than about 15 miles though.
Today, took roughly a 25 mile roundtrip with no problems. Made the exact same roundtrip about 2 hours later and the red warning, VSC, brake system and check engine lights all came on (see pic) about 10 miles into the trip. I immediately turned AC off to remove that stress. No changes in car's behavior, however. Made it back home, turned car off and waited about 20 minutes. Turned it back on and only the red warning and check engine lights came on. 2 hours later....same two lights are still on.
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