Prius (2004-09) :: High Temp Warning Light Goes On And Off
Jan 16, 2014
I have a 2006 Prius with 176k miles on it. I drive it about 65 miles each way to work every day. If I really baby the throttle, no warning lights ever come on, and the heat will take about 45 minutes to kick in. If I use the gas a little more aggressively, the heat will start working after about 30 minutes when I get on the freeway and speed up, BUT the high temperature warning light will intermittently come on. First, the red triangle Warning light will come on, followed by "PROBLEM" on the display followed by a red temperature indicator.
Typically it flickers off after just a few seconds, but sometimes the temp light stays on for longer, maybe 30 seconds or a minute before it shuts off. Then it continues to go on and off every few minutes for as long as I'm on the freeway. It doesn't seem to be directly related to when I hit the gas. I have checked the coolant level and it looks fine.
I bought the car back around 2010 when it had just received it's 100k mile maintenance and they had also just replaced the water pump. I haven't looked at the OBD-II codes, if there are any. I have never replaced the 12v battery. The lights are pretty annoying/alarming and I'm not sure if it's "normal" for the heat to take 30-45 minutes to come on. Maybe the 12v battery or the inverter pump need to be replaced?
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I have a 2005 Prius with 234K. Over the last week, the red triangle has been coming on along with "problem", followed by the high temp light. I originally checked coolant levels then took it into Toyota. Here was the diagnosis:
Found two low voltages codes stored
Replaced thermostat
Notes: Temp light on MDU does indicate malfunction. Low battery may have erased codes. Found the cooling system low on coolant. Pressure tested system (no leaks seen at this time), tech noted thermostat stuck closed. Replaced thermostat and refilled cooling system.
Now on the 45 min commute home the error did not re-occur, but it did happen the next day. I took it back into Toyota and this time there were no errors stored. I also told them that the heater wasn't blowing hot air but when they tested the heater it worked fine. They told me to document any time it happened to see if I could find a common cause.
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My daughter has a 2001 Prius with about 165,000 miles on it. She was driving it and the red high temp light came on and stayed on. She also said that a few minutes later she lost power. She stopped and turned it off. Waited a few minutes, and started it again. The light went off and she drove it home about 5 miles. The light came on when she got home. No engine codes. I changed the thermostat. I filled it back up with fresh antifreeze and water and took out to test drive. No leaks. 2 miles down the road the light came back on. I stopped and checked it. upper radiator hose, hot and lower hose cold. Radiator not warm. Blowing out hot air with the heater. I think the water pump belt is on, as i am at work right now but will check as soon as I get home. I took the old thermostat and put it in a pan of boiling water and it opened, so apparently it was the thermostat.
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In my one-owner purchased-new 2005 Prius w/ 74K miles and w/ no maintenance/accident history other than doing all scheduled maintenances at Toyota Dealers along w/ recalls applicable at each time (other than we had Toyota replace the 12V battery last year just because I knew it would die at some point anyway and I don't like pushing my luck; I'm not 100% certain if there's been a recall on any water pump for this car and if so, don't believe the dealer has mentioned it), I have the following indicators which appeared all at once while I was driving along at around 45 MPH in no unusual circumstances (80F, dry afternoon, about 30 minutes into a trip of mixed speeds, no loads in the vehicle, no effect on the car while driving):
From Left to Right on the display:
1) Red Triangle - Master Warning Light
2) Orange (Symbol)CHECK - Malfunction Indicator Lamp
3) Orange (!) - Brake Warning Light (but it didn't highlight the word 'Brake' in red)
4) Orange VSC - Vehicle Stability Control Warning Light
On the Screen:
Orange Car w/ the ! symbol - Hybrid System Warning Light
We immediately aimed for the house (about 5 miles away); the car drove perfectly fine, with the engine stopping and starting at lights as needed, with speeds going from the 55MPH we were traveling at the time of the alarms down to 0 and back up thru 35/45 MPH and such per normal off-interstate driving. The battery currently shows all the blue bars, and the engine and hybrid systems showed charge/discharge as usual as we drove. There was no discernible change in the driving reaction of the car to brake, steering, accelerator, etc.
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Vehicle: 2009 Toyota Prius Base ... Recently my car started showing the master warning light along with the temp warning light on the navigation screen. After opening the hood and inspecting, there is a coolant leaking from somewhere. Took it to the dealer and was told there is no leak but a bad/blocked coolant tank assembly. Question is, if I bought the tank myself for under $1k, could I replace it myself? What would be involved besides replacing coolant? Do I need to get the air out of the lines? Etc.
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First background: G2 car has 215,000 mi and recently got P1121 scan code, so I replaced the coolant control valve. that's when high coolant temp and no cabin heat started.
on CCV top nipple connected to hose that had a dot on it and hose goes under inverter cover on right, next nipple down went to hose slightly to left of first hose, bottom hose goes to thermus can. initially ran car in diag mode with high heat, no heat in cabin.
so I got a Autel 519 scan code reader and I see now that the only code is a P0505 (idle air control malfunction)
taking car down my road for short test run, I turn off cabin heat completely and watched the ECT. after a while it climbs to around 220, then while engine is running quickly goes to 245F then 260F. At that point in time (around 245F) the high temp indicator lights up, temp stayed at 260ish so I return home. With car in park, cabin heat off - the temp returns back down to 220F. if I rev the engine temp again climbs.
I have gone through all suggestions, open radiator bleed valve, manually 'pumped' coolant hoses, turned on/off high heat in cabin and finally with car off removed and jumped the CHS multiple times for about 20secs.
Have purged the coolant system over period of days and coolant appears to be full as level is near top of radiator cap, no bubbling, no gurgling.
However 2 mentioned problems continue... I am starting to suspect coolant thermostat but it would seem strange that it would go at precisely the same time as coolant control valve.
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Just bought a 2002 Prius for my daughter at an auction and the car has been driving fine the last few days even though the hybrid warning light has been on and off. Found no fault code with OBDII. Found out later from Toyota service history the cause of the hybrid warning light was a leaked hybrid battery. The previous owner disposed the car off at the auction before the problem was fixed.
I was driving today and the coolant high temperature came on and I can't rev/drive. Stopped engine and re-start after a while and coolant high temperature warning light gone. Drove a short distance and coolant high temperature warning light came back on. Used a OBDII and found no fault code. Radiator hose by the radiator cap is cold but hose at the top right side of radiator by the hybrid system is hot. Opened radiator cap and it is full of coolant.
The car has been serviced on 12/26/2012 before it went to the auction. Can air pocket trapped in the radiator cause this coolant high temperature warning light and can't rev/drive problem. Also today is the first time we didn't use the heater. We used the heater to defog the windscreen and heater work.
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I was driving my 2007 Prius on the freeway this morning after picking it up from my mechanic and the high coolant temperature warning light came on for ~4-5 seconds but then disappeared. I was able to safely drive it another 5 miles to work and park. My mechanic changed the engine and transaxle fluids in my car (along with pcv valve and serpentine belt replacement, engine oil and filter change) just before, so we think this could have been due to an air pocket in the coolant system. I will need to check the coolant level once the engine has cooled down and refill if necessary. I plan on driving it around locally before going on the freeway in case the warning comes on again.
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We recently purchased a used 2006 Prius. The vehicle has approximately 74K on it now. Well the other day my wife went to leave work and pressed the power button while pressing the brake pedal, and the Master Warning Light and brake warning light both came on. The car would not allow her to shift the car so she tried to turn it off and it wouldn't do that either. After about 5 minutes she finally got the car to turn off, and when she restarted the sequence everything went back to normal and she drove home fine.
We called 2 dealers and they both seem to be confused by the symptoms, but one thought that maybe the battery was old on the transmitter. So thinking that might make sense I replaced the battery with a new one.
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My wife and I own a 2006 Toyota Prius that we bought used 2 years ago. a couple of days ago, the master warning light (red triangle exclamation point) and check engine light came on. I took it into the dealer and of course, our hybrid battery was dead - battery and a new ECU required.
Our car is at 99,000 and 32 days out of warranty. Went down the road to atlanta hybrid repair. they were incredibly nice, and said that my computer was fine, but the battery would need to be replaced.
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My 2013 Elantra twice now has almost overheated. About a month ago i had the software patch related to the cooling fan done. Since then, twice the temp almost hit max and the warning light came on. Both times i had driven it in 80 degree weather with 3 short trips to various stores. Both times the air conditioning seemed to stop working and the gauge started to rise to max. The second time i turned off the car and restarted it and everything returned to normal. If it happens again i will check to see if the cooling fan is on. It seems to me that turning it off and on to fix would be a software glitch. The car has 30000 miles on it.
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I was driving down the road and the VSC warning light came on with the check engine light... What could be wrong should I have it tow to the dealer!
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Whilst about half way into an 8 hour drive to NYC my engine temp warning light goes off.
Blast the heater and pull over at the next closest rest stop.
No leak to be found. Looks as though the coolant level is okay Burk can't tell since the car hasn't cooled down yet. Engine bay doesn't seem crazy good. No strange smells.
Turn the car off then on and the warning turns off. I let the car cool for 20 min then back on the road. Warning comes on again on the highway.
What it could be? Possibly the thermostat? Could this fix itself?
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The red triangle warning light on our 2004 came on and went away again It has 100k miles If I take it to the dealer can they pull some codes and figure out why it turned on We have to drive the car to 600 miles for the upcoming weekend and I don't want to be stranded on the side of the road The car has 103,000 miles We just replaced the 12v battery so I know that is OK
I also saw the following things to check. Is there anything else we should check?
1 - Are any warning lights on besides the red triangle? For example, the red BRAKE light, the amber ABS and VSC lights, or the amber circular icon?
2 - Did you check the brake fluid level? If low, buy a new container of DOT3 brake fluid and replenish as needed This fluid will dissolve paint, so do not spill it
3 - While you are at it, check the radiator and inverter coolant levels by looking at the translucent reservoirs behind the radiator and next to the inverter If low, fill with Toyota Super Long Life Coolant
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It was driving me crazy that the red triangle warning light (master warning light) flashed for only a split second, once per day, two days in a row.
I drive 100 miles per day. My 2004 Prius has 136K miles.
It turned out to be low motor oil level, 1.75 quarts low.
My car is burning about one quart every 5K miles which probably is within the normal range for a 136K car.
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I was driving earlier today and it flashed twice (about a second and a half each), and then didn't see it again for a few hours. I was going about 40 MPH at the time.
I was driving somewhere else today and when I got to the 70MPH mark (really, between 60-70), it objectively increased in frequency. I searched google and these forums, and the closest thread I can find that shares my ailments was this one:
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After 10 minutes running errands in stop and go traffic, I noticed the VSC warning light. It was a hot and humid day (mid-80's). Made it home and was unable to open my garage door with the mirror that is equipped with an automated door opener. I turned the car off so I could open the garage, and when I tried to start my car again using my smart key, it would not start. I put the key in the key slot and was able to start the car, but the smart key, radio, windows and automatic door lock would not work.
Mileage is just under 25K.
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So the other day my girlfriend got in her car and it had the master warning light on. we took it to the dealer and now they are saying it is something with the transmission and it would be cheaper to just install a new one. Another thing is how could it be the transmission if i drove it over to the dealer and head no problem with the gears changing, but he also said something about a voltage leak.
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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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On my gf's 09 Prius the warning button doesn't light up during the night with the headlights on. You can't see it. Is this normal?
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2015 gti 6mt. Just after car wash today engine light came on, then I noticed the gauge was running at 270 just below redline.
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