The red triangle warning light in your Prius can mean any number of things are wrong with the car. But there is no cause for concern since you can fix the ... again, will trigger the red triangle warning light. The fault codes you might get will all indicate a problem with the hybrid system. But in most cases, you will also see a red battery ...Jul 20, 2020 · no - but I'm only using the free version of dr. prius. i do have the paid version of torque pro. nither of these show a battery or engine code - even though red triangle and little headlight wobble symbol are displayed. (maybe it's just that headlight leveler thing). Seymour Tennessee. Vehicle: 2005 Prius. Model: N/A. 2005 Prius 190,000 miles....Red Triangle and brake light on panel....as soon as you park and try to restart it will not engage in drive or reverse....check for codes show nothing....the last time it happened i was able to use an obd2 device with an iphone to clear codes even though no codes ...Hey all, I have a 2006 Prius with 113k miles on it. The red triangle, cel, and the red car symbol on the mfd all turned on suddenly. Got it scanned at orielly's but no codes came up.The red stuff all over everything is 100% synthetic grease to prevent corrosion. Works great. The extra red lead on the 12 volt terminal is for a towing light aux power supply. Sometimes after you restart the car it will show alot of codes that's ok just shut the car off and start again there will be no codes.2004 Prius 226K mi, Red triangle and yellow check engine, brake, VSC lights, red car w/! in display. ... which seems sorta consistent with what Luscious Garage says about the P3030 errors: Toyota Prius code P3030 "High Voltage Line Snapped" - Luscious Garage | Hybrid Specialists Hoping it is this simple! #15 chrisgagne, Oct 8, 2018.P3000 code indicates the problem with your Prius' battery or with the total control system. Reasons behind the Red Triangle of Death. Curious about the "Red Triangle of Death"? It's not just any symbol—it's your car's way of talking. Join us on a journey to uncover why it's so intriguing! Check for Warning LightsSteps To Resetting The Prius Red Triangle Light. To reset the Prius Red Triangle Light, follow these steps: 1. Diagnose the problem and disconnect the hybrid battery pack. 2. Remove the battery cover and locate the source of the issue. 3. Clean the triangle of death and apply anchoring compound. 4. Dry the silicone drain and start the …Vehicle: 2005 Prius. Model: II. A bit more on this. The 12V battery was at 12.2 volts. I put a trickle charger on it and brought it up to 12.9. Now when I power up the car the red triangle is still there but the brake and vsc warning lights are off. The voltage at the battery reads 13.5 with the car on.Looking at this thread: 2007 Prius - Check Engine, Red Triangle, VSC Lights - 12 volt battery issue? | PriusChat I match that pretty closely. Guessing the HV battery is finally over the edge. Weird that it trips those particular lights/codes. Has anybody used the batteries from here: New Prius Battery Kit (GEN2, 2004-2009) - New Prius Batteries LLCPrius Red Triangle No Codes. If you have a red triangle with no codes on your Prius, it means that there is a problem with the vehicle’s electric system. This could be caused by a variety of issues, so it’s important to take your car to a qualified mechanic to have it checked out.Hi all, My 2009 Prius suddenly got the big red triangle with exclamation and check engine light (CEL) on along with the MFD warning ( red car with exclamation point) the other day when my wife was driving the vehicle. She told me the signs just appeared out of nowhere. I took the vehicle out to AutoZone and have them read the code and P0A93 …The wifey says the red triangle warning light on our 2004 came on and went away again. ... No errror code was generated. #16 ... PriusChat has been the go-to spot for ...2014 Toyota Prius red triangle with codes: P0A84 and p1578 Along with a bunch of brake codes C1203 C1210 C1336 C1345 C1392 Car still drives but after couple hours it'll go into a limo mode or something , has less power and battery meter is on the lower side.I checked the 10 amp fuse driver side inder hood.No Codes, Red Triangle, Brake, Check Engine & Car Outline in MFD. Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Buckthorn, Apr 19, 2020. ... >>>> My 2007 Prius is showing the exact problem you described earlier "Got red triangle, brake warning, check engine, plus car outline with exclamation mark in upper-left ...Red Triangle, Problem and slow Prius on uphills. Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by aliasbody, Apr 5, 2015. aliasbody New Member. Joined: Apr 5, 2015 5 1 0 Location: Barreiro ... will need to read the trouble codes, which will give you (and us) ...r/prius. • 3 yr. ago. KaBuKiM. Prius Gen 2: random quick warning light, no error codes. Hey everyone. I own a 2007 Gen 2 Prius and lately it started showing the red triangle …5 posts · Joined 2010. #1 · Jan 5, 2012. In the last few weeks, I get the dreaded Red Triangle with exclamation point on the dashboard with just the word "Problem" on the display. It only happens when I make a left turn and barely lasts one second (Just long enough to read the word "Problem"). It only happens (so far) on a mountain road where ...Apr 29, 2020 · 2008 Prius. Model: II. A hybrid battery failure usually has more lights than the triangle and check engine light. I would suspect maybe you just have a less expensive problem on your hands (like a inverter pump failure). To easily check that, open the cap to the inverter pump reservoir (the pink fluid that's slightly to the right center when ... In another thread, you mentioned that you were getting trouble lights because your 12V battery was depleted. I'm assuming that was in the past, and you have now checked your 12V and found it to be fully charged. If not, that is the first step. If the 12V is fine and Torque Pro is not reporting codes, the trouble is most likely coming from an ...Find one that works well with Dr Prius, as you might want to run a battery diagnostic, depending on the codes. Many people will have a similar experience as you, "triangle came on, car stopped". But behind that triangle are a multitude of possible issues. You need a pointer as to what your isssue is. 2.My friend has a 2008 Toyota Prius. The red triangle came on. I got it to go away by disconnecting the battery and touching the + & - together without the battery connected. Then started it up ran 2 to 3 miles red triangle came back on along with the VSC being lit up. It did not seem to mess it up as to the running of the car till it was turned off.The code is for an inverter failure. Most likely you need to replace the inverter coolant pump. A garage can do it or you can do it yourself. You can get the part from Toyota, order it from an auto parts store, or you could get one from eBay or Amazon. There are several how-to and diagnostic videos on Youtube, along with detailed written ...> Gen 2 (2004-2009) Toyota Prius Forums > Gen 2 Prius Main Forum > Generation 1 Prius Discussion > Attachments are working again! Check out this thread for more details and to report any other bugs .You said "P300s" ... P030x (zero after the P) would be run-of-the-mill engine misfiring codes, but the Prius does have some hybrid vehicle codes that start with P300 (no zero after the P). ... from the whinny sound and shutter would be a bearing in the "transmission" is gone and its overheating causing the red triangle but no codes but I have ...> Gen 2 (2004-2009) Toyota Prius Forums > Gen 2 Prius Care, ... Attachments are working again! Check out this thread for more details and to report any other bugs. Red triangle, no codes. Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by mohater, Aug 13, 2020. Page 2 of 2 < Prev 1 2. mohater …My friend has a 2008 Toyota Prius. The red triangle came on. I got it to go away by disconnecting the battery and touching the + & - together without the battery connected. Then started it up ran 2 to 3 miles red triangle came back on along with the VSC being lit up. It did not seem to mess it up as to the running of the car till it was …jadziasman Prius owner emeritus. In my 2005 with 133,000 miles, I recently have symultaneously been getting the big ! red triangle on the dash and yellow headlight symbol (with small pointing arrows at either end of symbol) on MFD - see attached. This then goes away but returns, usually after traveling the rural washboard paved local roads.The red triangle warning light on a toyota prius is the check engine light and should be brought to a dealership, it could range from low oil pressure to something more serious. likeAlternative LikeToyota Mechanic: john. 1. Check the Hybrid Control Electronic Control Unit (ECU) for codes and if any codes are stored there, fix them first and see if the C1241 returns. If the 12 volt battery voltage is low, this code may set along with a C1256 (accumulator Low voltage malfunction) code. 2.Within the past week, my 2006 Prius (251,000 miles) started exhibiting a problem involving the Red Triangle. The triangle would come on for a few seconds, and the video display would show the not-really-very-helpful message "Problem", but there was otherwise no perceptible change in the car's behavior.Thanks for any and all advice about the Red Triangle, what could have caused it and so forth. ... the car will be happy to tell you where to look for the source of the trouble code/s that triggered the warning triangle if you read the codes. There are countless threads here that deal with choosing a code reader. ... week, when I will drop off ...When you get a trouble code, usually it is too late to do much if anything about your hybrid battery. Then it happens—the triangle of death, the master warning light. The thing is this if you ...Prius Red Triangle No Codes If the Prius has a red triangle with no codes, it indicates that there is a problem with its electrical system. To ensure the vehicle’s integrity and safety, it is best to take it to a qualified mechanic for assessment. In order to prevent further damage or issues, one may choose not to drive during this time until ...Vehicle: 2010 Prius. Model: III. Recently, driving from work, I got the Red Triangle, yellow circle with !, yellow check engine, and yellow ABS light come on. Car seemed to behave alright. Drove it home and turned the car off. When I start the car again, only the red triangle and check engine lights are on.Everything Toyota Prius! Currently private to support the proposed changes to third party apps. ... OBD2 codes, have no idea where to go from here My 2009 gen 2 prius runs fine as far as i know, other than these codes that came up. Check engine light is on and every now and then a red triangle appears for a brief second. Car sometimes smells ...N/A. When you first log into techstream and connect to the vehicle, you'll see a column of buttons on the left side. Click the health check button to retrieve the codes. You'll get a screen that lists all the codes present. Look down at the bottom toward the right and click the blue icon that looks like an engine with an eraser on it.Vehicle: 2006 Prius. Model: N/A. I have a 2006 Prius with 165,000 miles. I put a new OEM Toyota hybrid battery at the beginning of June and the car has run as normal. A couple weeks ago after maybe 5 minutes on the road, we got the red triangle of death and assorted other lights. This was maybe the coolest weather we've had in a this …Top Repair Three: P1121 Coolant Flow Control Valve Position Sensor Stuck. Another contributor to our check engine light list of failures and a common one is the P1121 code. This code means one ...2007 prius loses power. Red triangle, ((!)) And VSC lights are displayed. I pull over, turn car off, wait about 10 minutes, turn car back on, drives fine with red triangle only light on. ... I sought out hybrid mechanics who said that they could read the codes and even my local Toyota dealership failed to solve the problem. #6 GinaCastano, Sep ...2006 Prius. Model: N/A. So I was driving after a few days on vacation and my car randomly started displaying the Red triangle and the Vsc light and the exclamation point light. When I got home I checked the 12v battery voltage and it ranged from 11.6 when lights were switched on and 12.2 when off. I heard that is low, but have not been able to ...The most common cause of the red triangle light is a water leak that corrodes a connector right above the battery. The second is a corroded ECU connector and a bad …The Prius has 203,000 miles and is 2008 with original hybrid battery. The Prius has always resided in Los Angeles no other states. I pulled the 12 volt battery for 10 mins and the Prius started up and dash is clear of warning lights no red Triangle or check engine lights. Then after idling for 10 mins and shut down the Red Triangle and the ...blindedliberal • 3 yr. ago. Step 1: Get a OBD II code scanner and scan for codes. See what the system is saying is the issue. Take it from there. Prius has far more than normal codes to scan. You should be able to do a search online to find the text for the codes the show up.The Toyota Prius Prime is called the best Prius yet—but is it enough to boost sales? A sweet price and new features make the case. By clicking "TRY IT", I agree to receive newslett...2001 Prius, Red Triangle, Check Engine Light, PS + Battery+Car red exclamation alert. Discussion in 'Generation 1 Prius Discussion ... A code reader is needed to do that. Most generic ones are useless on a Gen 1 Prius, because they will only show codes from a couple computers (engine and possibly brake) and totally ignore the other computers in ...> Gen 2 (2004-2009) Toyota Prius Forums > Gen 2 Prius Care, Maintenance and Troubleshooting > ... After sitting for almost two weeks the red triangle and fault codes P0A80 and P3019 appeared assumed ithe 12 v battery (new yellow top 3 months ago) had gotten a little low. Drove 25 miles and reset, problem came right back.You are right, the catalytic converter issue is unrelated to your current no-start problem. 4. You are wrong, with regards to a "dead" traction battery and the Prius being able to run. It depends upon exactly what is wrong with the traction battery.I tried the Dr Prius battery tests, drove up and down some hills to get some electrons pushing around. I ended up with a new red triangle. the center temp sensor was in the high 130's, while the others were at 120..at one point I got a message that the inverter was too hot to force charge. Codes are P3000 and PA080.2004 Prius. Model: One. I have a 2004 Prius with a red triangle of death along with an yellow exclamation point next to it and a pinkish car symbol with a exclamation point on the screen top left corner. It will start intermediated when u let it sit couple hours and nothing will show on dash till couple minutes of letting it idle or driving it.Psychiatrists don’t know what “the pink triangle pill” is and screaming at their staff can impact your care podcast episode We all like to think that our psychiatrists are perfect ...2004 Prius. Model: N/A. 2007 Prius Gen 2. No readable OBD2 Codes. No Green Ready dash light. No blown fuses found under dash or engine compartment. Many other dash lights are visible though VSC,ABS, Red Triangle of Doom, fuel level indication. Voltage drop in 12 volt battery detected however above conditions still present after …N/A. When you first log into techstream and connect to the vehicle, you'll see a column of buttons on the left side. Click the health check button to retrieve the codes. You'll get a screen that lists all the codes present. Look down at the bottom toward the right and click the blue icon that looks like an engine with an eraser on it.2007 Prius. Model: N/A. Since you are still interested in what caused the red triangle, go to any autoparts chain that offers the use of a scanner for free (as Bisco said above) or go to the dealer and have the vehicle checked/scanned.. either way be sure to have all the codes written down for sharing.Multiple codes causing red triangle and check engine light. Hi everyone. I have a 2007 Prius with 181,000 miles that I've had about a year. I've had to replace hybrid battery cells on 2 different occasions so I thought when the triangle appeared again, it would be the same thing. Instead, I got 4 codes that I haven't seen before from my car.There are a lot of big hills in the SF area, and that could easily cause a real or phantom out of fuel situation. The red triangle is like Microsoft's BSOD (Blue Screen of Death), where it doesn't really make any difference why it's there - no matter what you are SOL. Tom. #5 qbee42, Sep 18, 2007.How to Fix Red Triangle of Death Toyota Prius Easy Way - YouTube. SENIOR PIRUS. 1.11K subscribers. Subscribed. 972. 135K views 1 year ago. The problem often coming from long time …Red barns are a common sight in rural parts of the country, but have you ever wondered why they're painted red? Learn about the purpose of red barns. Advertisement If you've ever d...The red triangle warning light on a toyota prius is the check engine light and should be brought to a dealership, it could range from low oil pressure to something more serious. likeAlternative Likecptjames said: Brake, (!), ABS, VSC Lights Warning Lights Popped On. Almost home when 4 warning lights (Brake, (!), ABS, VSC) came on Friday after driving about 45 minutes from work (around 13-15 miles). 2006 Prius with 133K miles. Brakes working. Found this forum and took car to garage next day. 12 volt battery replaced …Try pulling over and turning the car off for a few minutes to reset it. If the hybrid check light comes on while you're driving, pull over somewhere safe. Turn off your car and let it sit for 5-10 minutes. Then, try starting it back up again to reset it.Jan 5, 2012 · 5 posts · Joined 2010. #1 · Jan 5, 2012. In the last few weeks, I get the dreaded Red Triangle with exclamation point on the dashboard with just the word "Problem" on the display. It only happens when I make a left turn and barely lasts one second (Just long enough to read the word "Problem"). It only happens (so far) on a mountain road where ... My beloved 2006 Prius with about 117,000 miles on it needs to go to the shop (I'm not a DIY mechanic). As I was driving home yesterday from work, all of the sudden the red triangle, VSC, check engine and a little car with an exclamation point on it on the display came on about 2 miles from home.Oct 16, 2015 · Vehicle: 2006 Prius. Model: N/A. I have a 2006 Prius with 165,000 miles. I put a new OEM Toyota hybrid battery at the beginning of June and the car has run as normal. A couple weeks ago after maybe 5 minutes on the road, we got the red triangle of death and assorted other lights. This was maybe the coolest weather we've had in a this fall (in ... The simplest way to reset a warning light in a Prius is to disconnect the 12V battery. This will erase the stored codes and reset the warning light. To do this, locate the battery in the engine compartment, remove the negative cable, wait a few minutes, and then reconnect the cable. 2. Use a Scanner Tool.> Gen 2 (2004-2009) Toyota Prius Forums > Gen 2 Prius Main Forum > Attachments are working again! Check out this thread for more details and to report any other bugs .I did NOT disconnect the 12V battery before unplugging the fan. I forgot this step. Will it cause issues? I also do not have a code scanner to remove the code. The red triangle is appearing on the dashboard. To check for air flow - I turned the car on the other day, and put a piece of paper against the air intake on the backseat.The diagnostic trouble codes usually start with a letter followed by 4 numbers, The letters can be P,C,B or U these letters are as follows: 1- P = Powertrain. 2- C = Chassis. 3- B = Body. 4- U = Network. Powertrain codes include engine codes,transmission codes,emissions related codes and hybrid system codes.Multiple codes causing red triangle and check engine light. Hi everyone. I have a 2007 Prius with 181,000 miles that I've had about a year. I've had to replace hybrid battery cells on 2 different occasions so I thought when the triangle appeared again, it would be the same thing. Instead, I got 4 codes that I haven't seen before from my car.So my 05 prius just had the Red Triangle, check engine light, VSC and (!) lights come on. Then they VSC and (!) went away and it was just the Red Triangle and Check engine light, then they all went away, then they all came back. ... touota prius code p0a08 12v charging from convertor/invertor system not charging also c1310 brake boos solnold ...Location: Oakland, CA. Vehicle: 2001 Prius. Model: N/A. My 2001 Prius has for the third time in approximately 4 months given me the combination of errors, Check Engine & Triangle of Death on the dashboard and Exclamation Point on the LCD. Each time the problem has cleared itself in less than 24 hours. The last time it happened I borrowed a ...The red triangle on your Toyota Prius can be caused by issues with the hybrid battery, which powers the electric motor and the gasoline engine. This is typically indicated by error codes P0A80 and P3000, commonly displayed on the On-Board Diagnostic (OBD) system.Google’s Android smartphone operating system uses source code contributed by the US National Security Agency. Especially in the post-Edward Snowden era, that’s a red flag for Beiji...Remove the throttle body and soak up all the extra oil that is sitting on top of the intake. Clean the mass air flow sensor. Reassemble leaving the air filter box open. Get some starting fluid. Spray starting fluid down the intake then quickly hop in the driver seat and try starting the car.2004 Prius. Red triangle is the master warning telling you that something is wrong with the car. Yellow snowflake on road light means that it's cold enough that roads can have ice on them (it' rather pointless as it stays on even on very cold temperatures where traction is not a problem). Picture of the light with up and down arrows on MFD ...The P0446 is what has been causing the check engine light to pop on every month or so for about 6 months now, and thats also what came up today. When I cleared that code, it cleared the check engine light as well as the red triangle, neither have come back on. #3 TeamPriusNewbie, Mar 3, 2024.Unfortunately, unless you have a code reader on-site, getting codes read on a Prius that won't move is impossible. Your best solution is to disconnect the 12V battery to clear the codes as follows: Remove the mat. Remove the cargo tray cover. Remove black plastic cargo tray. Remove cover over 12V battery in the passenger rear corner.At first the red triangle and display of "There is a problem with the transmission P lock mechanism..." came on when the weather was bad or wet, then would eventually go back to normal. ... It's been about 10 days or so and no P0446 code or parking system warning. ... Autozone: 2007 Toyota Prius 1.5L MFI HEV DOHC 4cyl Optima Battery, Part ...How to fix the Toyota Prius triangle of death due to water intrusion in your 12v battery compartment with just a tube of silicone and some labor. I also have...The United States flag is folded into the shape of a triangle to represent a tri-cornered hat, in homage to the hats wore by colonial soldiers in the fight for independence in the ...
1. The check engine light is an icon shaped like an engine. This certainly is distinct from the master warning red triangle. 2. It is possible for the master warning red triangle to turn on when no diagnostic trouble codes are logged. For example, make the Prius READY and put the gear selector into D. Then open the driver's door and see what .... Longs ad pukalani
At 60 miles an hour, the red triangle and check engine light. At 60 miles an hour, the red triangle and check engine light come on. They indicate it is a hybrid cooling pump and the stability control system. … read more. Ted Ritter. High School or GED.I'm having a strange Prius issue and looking for some help on what to do from here. Background: 2005 with 120k on it; I've had it 5 years. ... No codes, they won't do anything. ... Then today, the red triangle, VSC, and yellow exclamation point came on while I was driving. I took it home (it drove fine; I'd have taken it to get the codes read ...My 2007 Prius started showing the red triangle after sitting in the garage for three months , with only being started and idled for a few minutes every weekend. It drives fine. The dealership completed a 10K servicing and found nothing wrong during its checkpoint inspection.Vehicle "turns on" with red triangle, brake, ABS, VCS, etc. HV battery indicates 0 (no lines) on display. No READY light, ICE doesn't come on. Only able to shift in Neutral on joystick. Any suggestions. ... Founded in 2003, PriusChat has been the go-to spot for Prius, hybrid, and EV discussion for over 10 years. PriusChat is the one of the ...> Gen 2 (2004-2009) Toyota Prius Forums > Gen 2 Prius Care, Maintenance and Troubleshooting > Server migration is complete! ... Red Triangle, no codes again.2005 Prius red triangle, orange brake lights while driving. Turned car off when I got home won't restart. Used BlueDriver code reader. ... . 2 Antilock brake codes C1953 and P1000. both codes stated "no code definition available" thank you for any help. #19 Randall 1, Jul 4, 2017. ChapmanF Senior Member. Joined: Mar 30, 2008 23,250 15,060 0 ...In disconnecting the 12 V battery you have deleted any codes that were present. 12.5 V is not bad and certainly not a reason for problems. If anything, all you need to do is put that battery on a charger and charge it up. #3 dolj, Jan 9, 2020.Many Prius drivers have reported the most common cause for a red triangle of death light is an issue with their battery. Typically, the …Vehicle: 2005 Prius. Model: II. Writing this post more as a log of my own issues and my troubleshooting steps. There are lots of good posts on this forum, but I thought I'd add my own troubleshooting experience. Mileage: ~95000. Issue: Driving home from a business trip. 1.5 hours into a 3 hour trip. In the rain on the highway.Red Triangle, ABS, VSC, Check Engine, Will not go ready and does not show codes. Discussion in 'Gen 2 Prius Main Forum' started by deegee, Jul 6, 2021. deegee New Member. Joined: Jul 6, 2021 6 1 0 Location: Georgia Vehicle: 2006 Prius Model: V. My daughter bumped her 2006 Prius into an SUV in front of her. No one was hurt.2007 Gen II Toyota Prius 203,000 miles. So the red triangle and VSC and check engine lights on my car recently came on. A few months ago before the lights came on I noticed that on some days I would start my car and drive up a hill and the battery would go all the way down to one bar.It is impossible there is no code with red triangle, use code reader compatible with prius. ... Get dr Prius to read ev battery codes. I just fixed a p3000 by doing rewiring from a connection for the hybrid fan that was all corroded Reply reply Top 3% Rank by size . More posts you may like r/ElegooMars. r/ElegooMars ...Our 2005 Prius (1 of our 2), sat for longer than expected or desired after some tough financial times for our family. ... '05 prius w/ red triangle, car w/! & main battery on MFD, codes P3000,P3030,C1241,C1259,C1310,C1378. Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by BubbaToyYoda, Jul 11, 2019.If you can, connect the voltmeter to either the battery in the rear cargo area or the jump terminal in the engine fuse box. With the car in ACC mode, foot off of brake and one press of Power button, take a volt reading. Then turn on headlights and take another reading. If less than 12.0 V then you need a new battery.2007 Prius red triangle, p2103 code, advice needed. Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by gstar, Sep 11, 2021. gstar Junior Member.Is is a red triangle with ! Inside or is it yellow (!) Yellow is your tire pressure sensor. Mine has been on for years. Red triangle is low oil or hybrid battery malfunction. I had the red triangle, but auto zone read it as no codes. Had a toyota tech read it, and lo and behold had a bad hybrid battery. Those are just my experiences.Vehicle: 2008 Prius. On my way home tonight - As i was making a turn near my home i got a bucnh of warning lights that came up. Red Triangle, VSC, Check engine and i belive the Brake Warning (The little Circle with the ! inside). The Car drove fine till i got home (only about a mile away at that point). Looked under the hood- nothing that stuck ...the red triangle keeps coming on with the water temp light but goes right off but no heat. Replaced the thermostat it worked for about a week. I have a obdII no codes. Took to a shop they said 12V and hybrid 49% both replaced 3.5 years ago.So what does the red triangle with an exclamation mark mean on a Prius? Table Of Contents. It signals that all is not well with your vehicle’s engine and that your attention is needed. This symbol though a thrive overdramatic for all the right reasons, is Prius’s version of the check engine light..