Toyota Prius water leak problems

Filed Mar 1, 2026 · Acceleration · OH

The way the accelerator pedal sensor is positioned allows for water infiltration from wet carpet / tracked in snow and water. The component is available for inspection upon request. Once sufficiently saturated the sensor fails, and ceases function DURING VEHICLE MOVEMENT. The problem is reproducible but has not been confirmed as a pattern of failure by the dealership. As far as my recollection, the manufacturer hasn’t inspected the part. P2138 is the associated check engine code and the vehicle enters limp mode DURING TRAVEL. The check engine light (and subsequent problems) first appeared while in traffic on 2/10/2026.

Filed Dec 19, 2025 · Body · MI

There is water leakage between the window and and the scraper seal resulting in water saturating the insulation in the door. During spring, summer and fall, this results in a powerful mildew/mold smell. We are concerned about health risks of breathing this pollutant. The dealership, Page Toyota in Southfield Mi has confirmed this. In addition, Toyota Engagement Center has also been involved. The problem is confirmed however the only solution they presented was the cleanup of only 1 inside door panel. The problem persists. We believe this ongoing issue presents a health risk and the outside rubber scraper needs to be re designed.

Filed Sep 11, 2018 · Electrical · 73,000 miles · VA

After heavy rains, water gets into the spare tire storage well, causing a short in the TPMS monitor for the spare tire. All tires have appropriate air pressure but the tell-tale shows until the spare tire storage area dries out - several days. This is a new phenomenon but there are no tears or dings in the gasket around the hatchback. Not sure where the water gets in.

Filed Sep 6, 2017 · Electrical, Engine · 163,500 miles · CA

Water leaking from engine cowel getting into ignition coils which is causing engine to shudder and stop sometimes too. Seems to be a known toyota issue yet not being rectified by manufacturer. Seals seem to allow water to get into the ignition coils hence the issue. Vehicle is stationary when first observed then shuddering and misfiring occurring as vehicle is being driven also leading to loss of power as its being driven which is quite dangerous on highways.

Filed Dec 5, 2016 · Brakes, Engine · CA

I've had my prius from 4-14 to the present 2016. I keep having issues with the dealership I take it to for repairs. [xxx] in la crescenta ca. After mentioning and describing issues, the staff there says that unless the dash lights up with a message and gives a code, they cant fix it. So in order for them to look into it any further than me telling them dash light is nec. I've told them about the AC noise from the first say I took the car in to get services at 33k. They say they don't hear or see anything. My AC compressor sounds like its going to explode when AC is on. Brakes have been extremely diff. To explain because of terminology. They seem to lose their power when being pressed and ABS seems to malfunction?? So they drive it and tell me its nothing I need to worry about and will be fixed when changed. Change brakes and the prob persists. Not only ABS but firestone says my hardware has issues as well. I bring it to the attention of the staff and nothing seems to get done about it... My odo. Speedom is/was off +2 MPH. My weather seals have been stripped and ripped off the vehicle which now causes water leaks from every crevice.. And the biggest two of all my complaints are 1- hybrid batt. Fan never worked and I wasn't told...hyb batt has never worked properly (drains way too fast when stopped at a light or in traff) along with the heat created by the batt and the engine that fill up the cabin and will have the temp raised upwards of 90+ on a 75 deg day. 2- the ecu's ipm's (or something like that) has not been calib. Or updated. Even received coverage stickers from toy headquarters stating full coverage if a.b.c. (listing of problems or malfunctions) I describe the exact same symptoms to them and get the same response"no code, no fix" help and ps I just checked the VIN online 4my veh & it says a diff package w/a bunch of extras that I never got upon purchase???_hmmm?? Information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Aug 20, 2015 · Acceleration, Body · 174,000 miles · CA · 1 injury

Tl* the contact owns a 2005 toyota prius. While washing the vehicle, the contact noticed 2-3 drops of water entering the front passenger side window. The window was closed at the time of the failure. Additionally, when the vehicle was started, the contact noticed that the instrument panel failed and would not illuminate. The contact engaged the push-to-start button with the brakes applied to shut off the vehicle, but to no avail. The contact then shifted into park and attempted to exit the vehicle when the vehicle abnormally accelerated. The contact was knocked to the ground by the driver side door and sustained minor injuries. As a result. The dealer stated that the instrument panel computer needed to be replaced. The dealer failed to perform a diagnostic to determine the cause of the electrical failure or the acceleration failure. The dealer also advised the contact that the manufacturer extended a warranty to cover the failure, but the contact's vehicle was over the mileage limitation by 4,000 miles. The vehicle was not repaired. The failure mileage was 174,000. The VIN was not available.

Filed Jun 23, 2014 · Body · CT

The check engine light for the electrical system illuminated. I contacted a-1 toyota dealer and they diagnosed leak on rear window. Heard water sloshing in the car. Water leaked into cargo area. The weather strip was replaced.

Filed Jun 1, 2014 · Electrical, Lights · 55,579 miles · TN

I have a 2007 touring prius with hid headlamps and 1 of the headlamp assembly started leaking water and toyota of kingsport, tn. Replaced it on oct. 28th 2013 and charged me $342.30 after discount. Now the new headlight and the other one is going off while driving and this happened on may 29th 2014. There is no way a headlight should fail in 6 or 7 months. Thank you for listening to my complaint, as I can't afford to keep replacing these very expensive headlamps. I went online and it seems I'm not the only one with this problem and can you get toyota to do something about this? I would appreciate any help you can give us prius owners with the hid headlamp system.

Filed Mar 4, 2014 · Brakes, Electrical · 127,000 miles · CA

There is a leak inside the 12v battery compartment that houses the battery and the electronic brake controller. The car's hatch leaks water in from rain and car washes and it collects around the 12v battery. In this prius, this area has the battery, electronic brake controller, and further back is the hv battery. There should not be any water that can leak into this area with the electronics. There are many google threads regarding owners experiencing this problem with water leaking inside the car's back area. This is a major safety issue that needs to be addressed because the battery and brake booster is in this exact area where it can affect the safety of the car when driven.

Filed Dec 7, 2013 · Body · 14,000 miles · NJ

Interior water leakage that drips down from the center console down to the driver and passenger floors. First occurrence occurred around 14k miles. It is possible that it was leaking before but I did not notice it because I have weather proofing floor mats, the wetness occurs under the mat. The dealer says clogged AC tubing by debris. They cleaned it out but charge me $100. Second occurrence in dec 6 2013 at 16k miles. It rain the night before. I suspect it is a design flow if there are trend for similar complaints or my car has a defective part(s). The consistent dampness under the floor mats could lead to long term issue with the car.