Prius (Gen 3) :: Master Warning Light Flashing With Beeping - Message On Console
Nov 15, 2010
I have a very strange issue with the car, it started last week once the weather had cooled down. Over a 3 day period when starting to drive the car from a cold start, after 30 secs, the following 3/4 things would happen.
The master warning light starts flashing with beeping
Message on the console 'Warning Key Detected'
Interior front courtesy light comes on for a few moments then goes off.
This continues until you stop the car. Turn it off. Wait then start again. Once going again it happens all over again. Until the car is warmed up, then it stops completely.
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A yellow triangle with exclamation mark illuminated on my dash. Pg 3-100 of the manual has a picture of the light, and the description calls it the "master warning light" and continues: "This indicator light illuminates When there is a malfunction on the low washer, Smart cruise control, and so on. To identify the details of the warning, look at the LCD display." Later in the manual there are examples of the light going off together with LCD messages, so I know that's what this light is called.
There is no message on my LCD display. When I first bought the car, I set the car to remind me at 5000 miles about getting my oil changed (I drive mostly highway, long trips etc.) For the last week, the car's LCD has been reminding me that i'm due for service in X miles. Today, I hit 5000 and the messages stopped. Around 5050 miles on the clock, the yellow triangle warning light went off, with no explanation on the LCD.
Bluelink diagnostics also reports no errors. Is it just the oil change interval that I set and passed?
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Details: 2009 Prius with Nav, no touring, cold battery voltage reading (via display) is 12.1v and 14.2v running
I'm noticing something odd and I figured I'd ask and see if this is normal or something else. Sometimes on startup I see the red triangle then it goes away and sometimes it doesn't show up at all. I've had a few occasions where the car doesn't start. I usually shut the lights off and then it's OK.
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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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I have a 2007 Prius. Today it began showing an warning indicator light (car w/key symbol) and sounded the beeps it usually does when I forget to take the fob out of the ignition when leaving the car. However, I had taken the fob out.
Eventually, the battery drained as it does when leaving the fob in the ignition without running the car. Later, the warning light continued to blink, but the beeping stopped. The battery still drained. The local Toyota dealer said he has never heard of something like this.
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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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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 have a 2001 Prius, my wife went and got an oil change and soon after she left the car shut off and the master warning light came on and it now acts as if the battery is dead ???
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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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When I start my car the master warning light comes on with all the other lights and then goes off with the other lights. It does not come back on while driving and there is no warning sound with it. This just start happening. It never came on with other lights when first starting it up. I have a 2009 Prius.
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Purchased the car several months ago and have done all maintenance and the car is overall flawless but I believe it to contain the original 12V battery.
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2001 Prius, 182,000 miles... Master Warning Light and brake light came on.....
I took it to the local dealer and they did a diagnostic, and they pulled the codes P0300, P3125, P0301, P0302, P0420, P3006, P3016, P3017. They said I would need to replace the the hybrid battery, the inverter, the catalytic converter, and the spark plugs.
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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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Today i tried to start my 07 Prius, all the normal start up lights came on, including the master warning light, but the master warning light didn't go off. No other abnormal lights were on. When i put the car in reverse to back out, it wouldn't engage in the gear, it wouldn't back up. When tried to turn it off, it wouldn't respond to the power button, it wouldn't go off. I kept trying and eventually it did turn off.
The other thing that wasn't normal was, with the power off, when i opened the door, from the outside to get in, or from the inside to get out, the car started making the warning beep with the red car door open light flashing. Close the door and it stopped.
I have hardly been driving the car since the end of June, i take it out about once a week to keep the battery charged, and it's been working fine. However, about a month and a half ago, i accidentally left the overhead light on and it was on for a few days, and then the battery would not start the car. Auto Club came out and jumped it and since then, it starts OK
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Recently bought a 02 with 34 K, had been well maintained. Last night it wouldn't start so hubby jumped it (properly). Started right away, making him think that wasn't what it needed. Right after that, the Master Warning light came on, the Car with Exclamation Point in it (hybrid system warning light) and the check engine light. The car runs, but it did die, and I had to restart the car, then seemed to drive fine. We don't live near a Toyota dealer, would a regular mechanic be able to read the codes properly? What else should we consider? Should we drive the car?
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I got this exact warning Monday which is discussed in this thread (linked below) and its problem was a bad inverter water pump while mine seems fine: . Also in the linked thread another whom had gotten the exact warning, but inverter pump was not the problem, believed it meant the Hybrid battery was bad and replaced it. , but mine, at least for now, as discussed below, seems fine.
was about to make a trip, 140 miles, gassed up and when leaving station all these (quoted below) warning lights came on. and the car should have been operating in cold condition still as gas station was only a few miles from home. :
Master Warning Light, Malfunction Indicator, VSC, (!), and Hybrid System Warning on Screen.
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It has now come on 3 separate occasions, a week or more apart. Each time the yellow brake or tire light comes on. The next few times they come on together at start up. Then the triangle by itself comes on, does not clear. First time I was driving up hill. Second time I had just hit a drive way riser (not jarring). Today I was driving on a straight level highway and it came on at around 55 MPH.
Battery had been replaced after first instance. The inverter valve replaced too. Now what? It drives normally. Though it is the yellow brake light that accompanies the triangle Toyota says that codes say battery problems.
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The master waning light came on while I was commuting on the freeway. There was no MIL. I've seen this a month or so ago and, as before, since nothing seemed wrong, I kept going. The last time this happened the warning went away after a day or so. This time it is sticking around. As before, there seems to be no problem with the car -- 80 mile commute, no loss of power, same gas mileage as before. I have a generic ELM327 OBD reader. I tried reading codes but there were none (at least none that it could read since there was no MIL).
Any second source for the Prius Mini-Scanner (or have one they want to sell)? Or, can a regular OBD scanner be trained to read the special prius codes?
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I have a 2004 Toyota Prius with 95k that I would like to drive to work everyday. Only problem is that after the car warms up(2-3 minutes of driving), whenever I gas the car to go the Master Warning Light comes on, and as long as I'm gassing it stays on followed up by a picture of the oil lamp comes up.
Now if you stop accelerating than it goes off and comes right back on when you start accelerating. I'm new to these Prius. I checked the engine oil level and it is almost full. I took the car to the shop and all they said was that the transmission was overfilled.(but they did not drain the fluid to bring the transmission oil down.) Is it possible that the oil picture on the top left of the Navi display is caused from overfilled transmission fluid?
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I just started getting this weird warning message on my dash console that says "STOP, STOP, Brake Failure, Service Manual" and the Brake and ABS lights turn on and then after a couple minutes it that all goes away.
I have checked the brake fluid and the fluid sensor and those are fine and i unhooked my battery and had it restart, but it still is giving me this message intermittently. My brakes work fine and i just had my brake pads done recently, so i know that isnt the problem.
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Today we had the oil changed and everything was good, drove to the hardware store and when we came back I put a heavy box of tile in the truck (I set it down hard, it was heavy). We then started it up and backed out and noticed the master warning light along with the vsc light and check engine light. I stopped it and checked the oil and all was fine. Started it back up and lights still on. I drove it across the street back to the oil change place and when we got into the parking lot there was no gas pedal. Pushing it all the way to the floor and it barely made it into a parking place and the battery on the mfd showed 1 bar.
When we restarted after a few minutes and when the engine came on it made a clunking noise. The guy from the oil change place came and cleared the codes. I didn't write them down like an idiot. After the codes were cleared it started fine with no noise and ran around the parking lot fine and has run perfect since (8 miles). I forgot that we put gas in as well in between the oil change and hardware store. The gas cap seemed fine. Is it possible the slamming of the box of tile caused a fuel pump inertia switch to cause all this? Could a loose gas cap cause this? It has been perfect since we bought it new with zero problems till today.
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