Prius (2004-09) :: 2006 - Master Caution But No DTC


Oct 17, 2013

2006 Prius; HV battery replaced Feb 2013; A/C condenser core replaced July 2013

I searched and found a few posts with similar issues, but could not find any solutions, so I'm checking again.

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Prius (2004-09) :: Master Caution Light / Dead 12 Volt Battery

So our '06 Prius has been very, very reliable, and we have a bit over 105K miles on it now. But we have a problem that the dealer hasn't been able to confirm, much less fix.

Probably three months ago now I began to notice that, from time to time, when I started the Prius, the master caution light (red triangle) would come on for 2-3 seconds. At no point did it stay on, and at no point did the Prius fail to start. So, it was an intermittent caution light of brief duration.

Then we had a bad storm coming (Sandy) and although it wasn't nearly as bad here (N. VA) as it could have been, I put the Prius in the garage, and it sat there for three days. When I went out to start it, the 12 volt battery was dead.

Fortunately I always back into the garage, and so jump starting the Prius - although it was my first time doing so - was no problem, and I got it to the dealer that morning. They tested the battery, and it was fine. They checked the codes, and all was well. It was as if the battery had never died. AND we stopped seeing the master caution light ... until two days ago, when my wife said that she saw the light a couple of times when she was out running errands.

Is it possible to have a problem with the 12 volt battery and/or electrical system that doesn't show up in the codes? And am I wrong to lose confidence in this very, very reliable car??

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Prius (2004-09) :: 2006 - Master Warning Light Came On / Car Died On Freeway

My master warnIng lIght came on In my car.I took my car into Hooman Toyota in Long Beach, California. They did a diagnostic test and performed their MPI WORLD CLASS INSPECTION. While I was getting it tested they said the invert water pump was under recall. No biggie. Nothing was found in the diagnostic and the recall was fixed.

Two days later I took my car to Palms Springs. While I was driving out there the master warning light came on. I started to lose power but it seemed like the computer would reset and it would be ok for about 15 minutes. I even lost power in the engine. I finally made it out there and figured it just needed to rest. 6 hours later I took off for home. 10 minutes into it the lights on the dashboard came on. The car lost all power and I was stranded off the freeway. My battery was down to 1 bar. I left it there overnight and had it towed to the nearest Toyota dealer. They said I need a new battery and that theirs bad gas. They wanted to replace the fuel tank. I replaced the battery.

The next day they said that wasn't it and was going to continue searching. I ended up towing it to my mechanic. He said there was no coolant and the headers are blown. He said I was better off getting a new engine. Let me take you back two days when that WORLD CLASS MPI INSPECTION was done. There was an 8 page report specifying what was passed on the inspection. The battery, coolant levels along with other fluids passed. Not to mention hoses and clamps and about 30 other things. I feel something was missed in that WORLD CLASS INSPECTION. I feel they are responsible for the car ending up the way it was.

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Prius (2004-09) :: 2006 - VSC / Brake / Master Warning And Hybrid Light On

I just purchased this vehicle from a private owner, and the first day everything seemed fine. After a few days I get all these warning lights - Master Warning (Red Triangle !), VSC, and the Brake Light, plus the NAV screen shows the red car with ! in it. The car seems to run just fine though. I don't notice any performance issues. One thing I did notice when I purchased the vehicle, the previous owner had a batter charger in the trunk before he took it out.

Now I've check the batter using the LAN Monitor and it shows like 12.1 volts when I turned the car on (not started). I decided to give the batter a deep charge overnight (2 amp charge) after disconnecting NEG terminal from car. It cleared the codes for a little while, but then they came back. My ODB II tester shows no codes, only codes I found on the LAN Monitor was for NAVI - 01-e3 sub 00-5. Do I need to replace the 12v Battery?

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Prius (2004-09) :: 2005 - Red Caution Symbol On The Dash

I woke up this morning and started up my 2005 prius to warm up. I live in New England and it freezing out today. About 15 min or so later I go back out to the car that only had the heat on and I find a large red caution symbol on the dash. I check to see if the e brake is on and thats when I look up and see it, the main battery symbol on the gps screen. I looked at my battery and only one small bar was lit up. I then noticed that the engine sounded like it was giving all it had. I turned off the car and went inside to call Toyota. I am waiting to hear back from someone in service to tell me if I can drive it. I have under 90k and it is due for an oil change maybe it's over by 100 miles. I did get the recall for the water pump and was planning to have it done with the oil change.

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Prius (2004-09) :: Stop Caution Warning Every Time On Startup

I've got a 2006 Prius with GPS navigation. Is there a way to get rid of the caution warning on gets every time one starts the car? I have to press "Agree" each time and am looking for a setting to get rid of the warning. The warning reads:

CAUTION
Drive safely and obey traffic rules.
Watching this screen while vehicle is in motion can lead to a serious accident.
Make all selections only while stopped.
Some map data may be incorrect.
Read safety instructions in Navigation Manual.

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Prius (2004-09) :: All Caution Lights Came On After HV Battery Replacement - P0AE0 Code

Well, just replaced my HV battery, hooked everything up (I think) and tried to start it. ALL the caution lights came on and stayed on. This is the code that showed up on the reader. P0AE0. The battery was refurbished and I changed over my Computer module and the contact posts. Everything is tight, and I compared my pre-takedown pics to the post-repair work and it all looks correct.

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Prius (2004-09) :: 2006 - At Start Up Master Warning Light / Brake Light Comes On

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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Ford F-150 (2004-2008) :: 2006 - Brake Light On Intermittently - Master Cylinder?

My son's 2006 F-150 4x4, with 107,000 miles, has in intermittent brake light on. I replaced the rear pads, as they were nearly into the rotors. The brake pedal feels fine in all braking conditions. Could the master cylinder still be going bad? Anything else to check?

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Prius (2004-09) :: Master Warning Light Comes On And Off

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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Prius (2004-09) :: Master Warning Light Came On

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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Prius (2004-09) :: Master Warning / Brake / ABS And VSC Lights All Come On

Title says it all. Occasionally when I try to start my 2007 Prius (70k miles), the master warning light along with the brake, ABS, and VSC warning lights all come on. I'll turn my car off and then turn it back on and it will start right away.

One thing that I notice is that it seems like the headlights and/or the MFD is dimmer than usual when this happens. I'll turn off the headlights, turn on the car, wait for it to start, and then turn on the headlights and everything will work correctly.

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Lexus GX 2004-09 :: How To Disable Navigation System Caution Message

My wife drives a 05 GX470. Is there a way to disable the caution message (i.e. Caution: Drive safely and obey traffic rules...) that appears on the navigation screen every time you start the suv?

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Prius (2004-09) :: Master Warning Light Came On / Car Won't Engage In Gear

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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Prius (2004-09) :: Master Warning Light, Malfunction Indicator, VSC Came On

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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Prius (2004-09) :: 2005 - Master Warning Light Keeps Coming Up

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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Prius (2004-09) :: Overfilled Master Cylinder Result In Damage?

Long Story short: Brakes replaced at local dealer (courtesy offer from Toyota Corporate). I paid dealer, submitted invoice and received reimbursement. Service tech replaced front pads and rotors. Everything seemed fine until the day I popped the hood to detail the engine. Noticed that the fluid level in the master cylinder was at the cap and the cap itself had "popped" due to the excess pressure in the system. Brought the car back to the dealer. I was reassured that after draining off the excess fluid, the braking system would be OK. I disagreed.

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Prius (2004-09) :: Master Warning / Tire Pressure / VSC Lights Came On

I was diving on the interstate and these lights came on and the car beeped. I checked the tire pressures and now the car will do nothing. It says a problem with park.

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Prius (2004-09) :: Master Warning Light Comes On When Start Accelerating

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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Prius (2004-09) :: Brake / ABS / VSC And Master Warning Lights Showing

Apparently my 2008 Prius decided to tell me in it's own way the same thing by showing me these lights this morning.

So they turned on while in a drive through, around the corner from my house. All except the master warning light. 5 minutes after the initial ones, the master light came on. And the braking power disappeared. I immediately got it home and shut it off..

After some research, I performed the 12V Aux battery test on screen in the car.

Confirmed -11.8v while ON, and 11.4 V when in ACCESSORY mode. So the 12v battery more than likely is the culprit for this problem.

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Prius (2004-09) :: Master Warning Light / VSC And CEL - Clunking Noise When Engine Came On

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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