Prius triangle light

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. ... If conditions for P0A80 are again met during a drive cycle, the DTC will be "Current" and the light will reappear. Hoping someone will explain it better, or correct my inaccuracies ...

Prius triangle light. Patrick is a well known Prius DIY Guru so his suggestions are to be followed as well. Second, your 12v battery looks weak so replace it. It should not drop below 12v after resting. the higher voltage 13.6-13.8 is seen when the Prius charging system is active, It says little about the condition of the 12v battery. There are two good choices:

Decoding the Red Triangle Warning: Immediate Attention: Whenever the red triangle appears on your Prius dashboard, it’s a clear sign that the car has detected a problem that cannot be ignored. Whether it’s an engine malfunction, hybrid system failure, or another critical issue, this light is a signal to act promptly.

2005 Prius. Model: N/A. Dear all, My 2005 Prius has about 224,800 miles on it. I has been driving okay until yesterday. While driving, there are many warning lights coming up, including the check engine light, Red Triangle, VSC and "!" lights are all on. I asked autozone to pull out the code to be "P0A80, replacing hybrid battery pack".ABS, VSC, RED TRIANGLE, ((!)) light on, CODE: P3009. Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Juan Carlos Valle, Sep 14, 2020. Tags: 2004 prius; ... 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 largest privately-owned ...Hi all, I drive a 2007 Toyota Prius. My car got the red triangle of death, along with the check engine light , VSC, and the exclamation point sensors all going off too. The car still works, sometimes like normal, sometimes it struggles to accelerate or keep the A/C cool, etc.2011 Prius, battery problem.Now the yellow triangle light won't go off and there is the sound of something trying to work under the hoo.d. Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about? It is the yellow, inverted triangle with the exclamation point in the middle.2006 prius won't stay running.. has these symbols on dash. triangle of death, skidding car, abs, vsc, .check eng light. have replaced water flow control valve, inverter pump and bled system at three p …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 ...The red triangle and the check engine light was on. I did this a couple more times, but the car would not go. I was actually pointed up hill, so I decided to back down a bit and turn around so the car would point down hill. ... Of course, for a Prius, 80 miles is only a gallon and a half. #8 Winston, Sep 20, 2007. Obewan New Member. Joined: Jan ...

Columbia, SC. Vehicle: 2007 Prius. Model: Touring. mcslain said: ↑. I am getting the infamous red triangle with exclamation point when I turn. Not all the time, but more commonly with a hard turn. My mechanic is stumped.Comment if you've ever had the red triangle!! Also, leave below each dirty joke I accidentally made in this video.I had multiple warning lights, including the red triangle and the car silhouette with a light through it, and was told I needed a hybrid battery replacement. Within two weeks of the refurbished battery replacement at the dealership, lights came back on. ... a sensor, or the computer. 2006 Prius 135,000 miles regular maintenance. Also, does ...Vehicle: 2004 Prius. Model: N/A. During a highway trip three months ago, my 2004 Prius suddenly lost engine power, the red triangle Master Warning light came on accompanied by a warning sound, and then the Hybrid System Warning sign appeared on the Multifunction Display. I pulled off to the side of the road and stopped.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. I’m still waiting to be told the fault codes but they recommend ...My 2006 (208k miles) Prius has an issue with the red triangle warning light. The light occasionally turns on for a bit and then off again while I'm driving without any sort of recognizable pattern. It typically doesn't go on until I have been driving for a few minutes, though. In the past, I have had this issue with low oil (it goes through oil ...

Re: 2008 Prius Red Triangle light or bad ju-ju in Prius We have had a similar situation with our 2007: This all started the day after we had taken the car to Toyota for water pump recall;While driving an orange triangle,break light,circle with (!) & a car in a red square on the touch screen all came on @ about 60mph;the car didn't automatically shut down but we stopped about 5 min later to run ...Model: N/A. 2007 Prius red triangle and brake system warning light came on. Hybrid battery fan as well. Toyota dealership confirmed hybrid battery failure and offered to replace. No thank you. I tested 12 volt battery which is 7 years old and found it was bad also. I replaced the 12 volt battery myself and plan on having the hybrid battery ...Hybrid Battery Replaced, still getting VSC, red triangle light and check engine light. Discussion in 'Gen 2 Prius Technical Discussion' started by ssolis, Feb 27, 2017. ssolis New Member. Joined: Feb 27, 2017 2 0 0 ... Founded in 2003, PriusChat has been the go-to spot for Prius, hybrid, and EV discussion for over 10 years. PriusChat is the one ...This easy breakfast “pizza” is a quick way to use up leftover pita bread. In just about the time it takes to brew your coffee, you can have slices of this hot, eggy dish ready. And...Jul 25, 2016 · Vehicle: 2008 Prius. Model: N/A. Edit: The check engine light is from a bad oxygen sensor. I have the part ordered, but am waiting on shipping. Also when the car was let sit for 2 hours the brake and vsc light were off when restarted, but the red master warning light stayed on. After about 15 min of driving the brakes and vsc lights came back on.

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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 ...2005 Prius. Model: N/A. My '05 Prius has 83,000 miles on it. A few days ago my wife said that the master warning light (the red triangle with the exclamation point in it) came on about 8 minutes into her drive to work. We live in Maine and the outside temp was in the 60's. She drives less than 10 miles to work over roads that stay under 50mph.Welcome to the ultimate guide to all dashboard symbols, warning lights, errors and faults for the 2001 to 2024 Toyota Prius to assist in troubleshooting, diagnosis and solving these problems. Please note: This guide covers every single possible symbol/warning light for ALL model variations for Toyota Prius, including standard, premium and top ...Verified. Hello, my name is Bobby. Thank you for the question. Most of the time this is caused by a failure in the yaw sensor located under the center of the vehicle. It is a common failure on Toyota vehicles. If the steering wheel is slightly off from being straight then this will occur also. I would have the alignment checked and even have a ...We recently purchased a 2006 Prius. We have approximately 215,000 miles on it. The red triangle light came on with the check engine light - but also, the hybrid battery intake cooling vent also came on at the same time (the one on the passenger side in the rear seat). We had cleaned out the fan before. While monitoring the display, we saw the ...

Well, I guess today was my turn. Leaving work and within a few seconds the red triangle of death, check engine, VSC, and orange exclamation mark surrounded by circle and parentheses lights came on. Luckily was still in parking lot. Turned car off and on again, no VSC and orange exclamation mark light on anymore.2007 prius. Ive had the same issue for about a year red triangle only. The red triangle comes on after 3k miles or so in between oil changes. it clears everytime i replace the oil. I drive about 500-600 miles per week. currently at 199k. i asked two service managers, had the same problem with a few other prius they service in town. couldnt ...Columbia, SC. Vehicle: 2007 Prius. Model: Touring. mcslain said: ↑. I am getting the infamous red triangle with exclamation point when I turn. Not all the time, but more commonly with a hard turn. My mechanic is stumped.They will light the MIL (message Information Light aka CEL (Check Engine Light)). I suspect the code reader you used (are using) is not able to read many of the other computers including the ABS computer; there are brake system related related codes which your code reader are not seeing. #7 dolj, Nov 18, 2016.2005 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.This is my second Prius, first was a 2008 that some moron hit and totaled it. I replaced it with a 2006. Anyway the 2006 had the red triangle of death along with every other light lit up like a Christmas tree. I replaced the hybrid inverter pump that iI purchased from Amazon for about $100 (genuine Toyota part).Model: II. Momotaro, I have exactly the same dashboard light signature with my 2008 Prius that just popped up. In the middle of a drive, got 4 warning lights simultaneously, 1) BRAKE (typically goes on when emergency brake engaged), 2) Brake warning light that looks like a tire with an exclamation point, 3) ABS, 4) VSC.Vehicle: 2008 Prius. Model: II. My 2008 has 162k miles. about a month ago I changed the plugs to OEM type. car drove fine. other night I parked the car. next morning started up to go to work and the red "BRAKE" light, yellow ( ! ) (not tire sensor one) and yellow ABS lights all stayed on. I use the parking brake every day as my driveway is ...Obviously the old ones had a problem they know about! 4/28/2006 - 2004 - 2005 model year Toyota Prius vehicles equipped with an Automatic Headlight Leveling System. Some Prius vehicles, equipped with High-Intensity Discharge (HID) headlamps and an Automatic Leveling Light system, may experience a Master Warning Light and Automatic Headlight ...

Obviously the old ones had a problem they know about! 4/28/2006 - 2004 - 2005 model year Toyota Prius vehicles equipped with an Automatic Headlight Leveling System. Some Prius vehicles, equipped with High-Intensity Discharge (HID) headlamps and an Automatic Leveling Light system, may experience a Master Warning Light and Automatic Headlight ...

This is how to Diagnose and fix your Toyota car if you need Accessory or parts for your car Click the link below;Toyota repair infohttps://techinfo.toyota.co...Model: N/A. I purchased my 2001 Prius used with 175k miles on it it currently has 185k. Today while driving I heard a loud beep followed by the Warning/Problem sign on my in-dash monitor followed by a red car symbol with exclamation as well as a Check Engine and Red Triangle. I took it down to AutoZone to get a scan on the code but after 3 ...Engine stalls, check engine light + Red Triangle. Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by dbandrew, Sep 19, 2010. dbandrew New Member. Joined: Feb 22, 2006 4 0 0 ... 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 largest ...Hello there, I have a 2005 Prius that I've owned since it had 4 miles on it. Absolutely love it! Over the past 10 years, I've had very, very few difficulties with it. In April 2014, we replaced the hybrid battery. on Thanksgiving day, 2014, the red triangle warning light came on and upon testing, this code P0A9C came up. My husband didn't see how …Many Prius drivers have stated the most common cause for a red triangle of death light is an issue with their battery. P0A80 and P3000 are frequently the codes that appear following a diagnostic. The battery control system of the Prius is identified by the P300 code.On a Prius, when the check engine light comes on it indicates a malfunction in the powertrain control system. You need to have the car scanned for codes to see where the fault lies. The red triangle lights because the check engine light is on. The VSC is disabled when the check engine light is on and that light comes on.The different orange lights on Toyota Prius . We will now one at a time talking about the explanation of the orange lights on your Toyota Prius , to help you identify the fault or problem you are struggling with.. Orange spring-shaped indicator on Toyota Prius . If you detect an orange spring-shaped light on your Toyota Prius , it does not signify a problem, but only the glow plugs' begin up .Disconnect the battery for 30 seconds, then reconnect it. This will often reset the system and turn off the warning light. Check the vehicle’s fluid levels and top them off if necessary. A low liquid level can trigger the master warning light. Inspect the vehicle for any loose wires or other potential electrical problems.

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Note that the symbol is not only on your dashboard, but is also on the MFD. From the US 2004 Prius Owner's Manual, section 2-5, "Operation of Instruments and Controls," "Gauges, Meters and Service reminder indicators," page 116: "This light comes on when the outside. temperature is less than +3C (37F). When the "IG-ON" mode is turned on ...EDIT: As far as the relays go, start by having the 12V disconnected for 5 minutes. Then connect the 12V, put foot on brake, and press the power button. In between pushing the button and seeing Ready, you should hear three clicks, corresponding to the system main relays. #9 seilerts, Apr 17, 2011.About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...Jul 25, 2016 · Vehicle: 2008 Prius. Model: N/A. Edit: The check engine light is from a bad oxygen sensor. I have the part ordered, but am waiting on shipping. Also when the car was let sit for 2 hours the brake and vsc light were off when restarted, but the red master warning light stayed on. After about 15 min of driving the brakes and vsc lights came back on.I removed the 12v battery, drained the water and dried out the battery well. After reinstalling the 12v, the car ran well for a day. Then the red triangle of death returned. Further research on the forum helped me test the voltage readings on the display. It was low, registering about 10.5 volts in ACC.Red triangle of death means a critical component of the car has failed. I'd get an OBD II scanner and check for codes. It can mean the coolant pump has failed, for example, which can lead to destroying your engine. Couldn't figure out how to add text to original post, sorry. 2007 Prius, 135k miles.The weather got hot, and The Bloop went all red triangle/warning light christmas tree. I had this happen before (2018) due to hot weather, neglect, and a low 12v battery. This time 12V measures low, fresh charge in the 12V (to a steady 12.6V and a passing grade on a load test) changes nothing. I obtain a Veepeak OBDII reader and the Dr Prius App.Hi all, Red triangle and lights came on while driving and was in limp mode. Once I got off the road, I tried to re-start, but no ready light. This happened like 5 times before, but re-started after a minute or so. I checked the voltage on the HV battery at 208 volts, but nothing directly coming out of the battery.N/A. I just had this same issue happen to me today. The door open light + red caution light was on with a constant beep while in drive. It turned out to be the inside of the door was dented where it presses up against the driver door sensor. Now, my Prius has 280,000 miles on it, so that may be part of it. ….

2006 Prius. Model: ----USA----. I had just started driving this morning, when I a beeping sound came on and the Brake light, red triangle, and the check engine light came on at once, it is a 2006 Toyota Prius and it is my first car so I am still new to diagnosing the issue with my car, I would really appreciate all advice, thank you.AZ. Vehicle: 2008 Prius. Model: N/A. Yesterday was driving my 2008 Prius (75K) down a paved road from a ski-hill (no snow/rain, perfect weather and completely dry road). Not hard driving, 20-30 mph some curves, very smooth road with no potholes, etc. Battery turned all green, its fan initiated and I also rolled back window during this 75 degF ...If it happened again and you are unable to get into READY after many tries, you can try the emergency hybrid control system start procedure: Code: (1) Push the P position switch. (2) Parking brake pedal is depressed. (3) Turn the power switch from off to on (ACC). (4) Brake pedal is depressed.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 ...Hi! I have a 2008 Prius. Triangle of Death, VSC etc. came on but car was driving fine. Took it to mechanic just to be sure though driving fine. ... Car started up as usual this morning (doors unlocked, all lights & AC came on) but the Master Warning Light (Triangle with Exclamation Mark) came on as did the letters VSC ...Moths and light seem to go hand-in-hand, but have you ever wondered why moths are attracted to light? Learn about moths and light in this article. Advertisement To understand this ...Location: new york. Vehicle: 2018 Prius Prime. Model: Prime Plus. 1 check your oil more frequently! you damage the engine by waiting for the red light to come on, the oil pump is pumping air then, not just oil. 2. On a normal car, 2500 miles is note excessive oil consumption.Got my first red triangle today with a car ! light. What does car! light mean? I ran Dr Prius app, nothing unusual, no codes. I couldn't run Techstream clone due to lack of English instructions on loading. I disconnected 12v battery running 12.5v, sanded down lead posts and reconnected, lights all gone. Could it be time for a new 12v battery?p0a80: hybrid battery pack failure.my2daylife! is not responsible for any damages done to you or your vehicle! this is for entertainment purposes only!Triangle Light on, brake system light, vsc light, car won't start. Discussion in 'Gen 2 Prius Main Forum' started by Fedejunin, Jun 27, 2017. Tags: brake system warning light; ... You can also read the Prius ABS codes with a short length of wire by counting light blinks; this can be handy if the warning lights come on when you don't have your ... Prius triangle light, Now it seems the Red triangle and Check Engine light stay on, and the VSC and (!) lights come and go. IT kind of feels like when the engine kicks on it kind of jolts a little. theres about 180000 miles on my car as well. Mechanic's Assistant: Okay, I'll connect you to the mechanic to discuss this further with you., Prius Red Triangle Warning Light. Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by terry pooler, Apr 10, 2019. Tags: prius red triangle warning; terry pooler New Member. Joined: Apr 10, 2019 1 0 0 Location: Apopka, Florida Vehicle: 2008 Prius Model: N/A., When the light turns on briefly during normal operation, it means your Prius is losing traction—and the system's fighting hard to maintain it. But if that light stays on, or if you see a light that says "VSC OFF" or "TRAC OFF," you're likely dealing with a different problem. These lights mean that your VSC system is off ..., Location: Aurora Oregon. Vehicle: 2007 Prius. Model: N/A. I got the red triangle of death just under 3 weeks ago in my 2007 Prius Gen 2 (215K miles) and that started my search for a solution. The information I got here on Prius Chat was invaluable and pointed me in the right direction for an economical do it yourself fix., This easy breakfast “pizza” is a quick way to use up leftover pita bread. In just about the time it takes to brew your coffee, you can have slices of this hot, eggy dish ready. And..., IstanbulLight 2019 in numbers. 77Countries. 969International Visitors. 7.757Total Visitors. 25%Total Visitor Increase. 122Local Exhibitors. 98International Exhibitors. 220Total Exhibitors. 12%Total Increase in sqm., N/A. 06 with 144k miles. Issue began with ! light & not being able to accelerate past 35 mph with the pedal to the floor. 1. Checked inverter coolant reservoir and the coolant was moving. 2. Checked Air Filter for cleanliness and found a paper towel under the air filter from when car was detailed, assumed was issue., 2) Check engine light. 3) Main warning red triangle. I also noticed that a square icon appeared on the upper left corner of the touch screen display ( I think its called the MFD?) It's a car shape outline, with an exclamation mark on it . I think it is a Hybrid System Warning indicator., Apr 21, 2022 · 11. Electronic Throttle Control Warning Light. Electronic Throttle Control Warning Light; This dashboard symbols illuminate to indicate a malfunction in the electronic Throttle Control system. If this light flickers for a long time, you should stop your vehicle immediately and put it in PARK., Location: new york. Vehicle: 2018 Prius Prime. Model: Prime Plus. 1 check your oil more frequently! you damage the engine by waiting for the red light to come on, the oil pump is pumping air then, not just oil. 2. On a normal car, 2500 miles is note excessive oil consumption., Hybrid Battery Replaced, still getting VSC, red triangle light and check engine light. Discussion in 'Gen 2 Prius Technical Discussion' started by ssolis, Feb 27, 2017. ssolis New Member. Joined: Feb 27, 2017 2 0 0 Location: Castle Rock, CO Vehicle: 2007 Prius Model: Four. 2007 prius. Replaced the HB week ago, Dorman hybrid …, Like all electronics, appliances can die without any warning. The engine warning light and the red triangle first appeared after 9 months after I brought it. The car had got a pass in the Toyota hybrid battery test 3 months before the warning alarm. There were 2 options, 1)replace the car or 2)fix it., To the right and near the back of the engine compartment is another reservoir for inverter coolant. It should also be filled with pink coolant, between the marks (most of the way full). There are lots of things that can trigger the red triangle light, including the drivers' door not being closed all the way when in gear., Moths and light seem to go hand-in-hand, but have you ever wondered why moths are attracted to light? Learn about moths and light in this article. Advertisement To understand this ..., The Prius Master Warning Light can be turned off by resolving the underlying issue causing the warning light to appear. Once the problem has been addressed, the warning light should turn off automatically. If the issue was minor, such as a loose gas cap or low tire pressure, it can be resolved quickly by the driver., 2009 Prius orange engine light and red triangle with. 2009 Prius orange engine light and red triangle with exclamation point lights came on the dash. I reviewed the manual's owner and it refer is an electronic hybrid control system or electronic throttle ..., To add a little fuel to the fire, I ran into something new over the weekend. Car (Gen 2 Prius) has a previously rebuild HV battery, about 2 years old. Symptoms were the red triangle popping up while driving. Owner was resetting by disconnecting battery. Check the codes and the only code present was Block 2 becomes weak., Also watch this video: How to make your Hybrid battery last a lifetime (secret tips)https://www.youtube.com/watch?v=OC7bCYnxnfYWhy you should buy a used Toyo..., The warning light appears in the shape of a triangle with an exclamation point inside it, and it can be accompanied by other dashboard symbols such as the VSC warning or ABS light. Understanding the meaning of this warning light is crucial, as it can help prevent serious damage to the vehicle and ensure the safety of the driver and …, 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. Like (11) Jeffery May 22, 2022 You guys need to learn how to spell and use proper punctuation, please 😂😂😂😂 ..., Between the exclamation point and other warnings, you can usually put the pieces together to determine what’s wrong. The triangle with the exclamation point can be either red or yellow, depending on what brand it is. The color of the warning has nothing to do with the severity of the problem. In most cases, this light also comes on solid., 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 most common problems that trigger the red triangle light for less than ten bucks. The most common cause of the red triangle light is a water leak that corrodes a connector right above the ..., The red triangle light keeps coming on intermittently on my 2007 Prius. It will say on the monitor problem with engine then will go off and back to normal. There does not seem to be any thing that tri …, 2007 Toyota Prius Brake Warning Light. The Toyota Prius brake warning light is a small light that will come on when the brakes are applied. This light will stay on until the brakes are released. If the brake warning light stays on for more than a few minutes, it is probably time to replace the pads or discs in the car., The Prius Triangle of Death is a genuine worry for Prius owners rather than a plot device in a science fiction film. It alludes to three potentially problematic parts that form a triangle: the electric motor, the inverter, and the high-voltage battery. ... After shedding light on the enigmatic Prius Triangle of Death, it's time to investigate ..., There is a warning light for the electronic power steering, and for high coolant temperature. Additionally, since there are two coolant reservoirs, one for the engine and one for the power control unit, the MFD will display "Hybrid System Overheat" if the power control unit overheats (the coolant temperature warning light is for the engine coolant only)., Hey all.. I have a 07 Prius. Red triangle came up. car would not start.. I turned off the car, checked the service plug and it was OK. Car still... Forums. Search Forums; Featured Threads; ... triangle light came on, and would not start-up, and it happened to be the 12V battery dying. i'm assuming the plug is mainly for the traction battery., See also: Prius Red Triangle Warning Light. Prius Warning Light: Gearbox Clutch. If the clutch warning light on your Prius is illuminated, it means that there is a problem with the vehicle's clutch system. This could be caused by a variety of issues, such as a faulty clutch pedal sensor, low fluid levels, or a damaged clutch. If you see this ..., Location: Sacramento. Vehicle: 2002 Prius. A 2001 Prius is getting a warning triangle. No check engine light, and with my OBDII scanner, it shows there are no codes. I can erase and the triangle goes out, but it comes back on eventually. It seems only if the car is driven a long time/distance it comes on, indicating some heat issue perhaps., 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 ..., The red triangle on a traffic light indicates that the drivers must stop and yield to oncoming traffic or pedestrians before proceeding. This is an important safety measure to help prevent accidents.When approaching a red triangle, drivers should slow down and be prepared to stop if necessary. They should also look for any pedestrians who may be crossing the street., Jul 29, 2021 · It could be a faulty sensor, wiring issue, module fault, engine malfunction, etc. To see what specifically is causing the light to come on the vehicle will need to be tested with a scan tool that connects to the vehicle. This test will provide a trouble code that describes what specific system is having the problem., 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 most common problems that trigger the red triangle light for less than ten bucks. The most common cause of the red triangle light is a water leak that corrodes a connector right above the ...