Toyota RAV4 battery drain problems

Filed Jul 10, 2026 · Electrical · GA

COMPONENT: ELECTRICAL SYSTEM / TELEMATICS (DCM)The vehicle suffers from a documented manufacturing defect involving the Data Communication Module (DCM/Telematics system, Calibration N01D14B4644). The module enters an infinite transmission loop when the vehicle is turned off, causing a severe parasitic battery drain that repeatedly drops the 12V auxiliary battery below operational voltage.This creates a severe safety hazard, causing total electrical failure and leaving the driver unexpectedly stranded without warning, presenting an immediate safety risk in extreme weather or unsafe locations.An official Toyota Techstream diagnostic scan on 07/08/2026 confirmed 7 active DTC faults in the telematics system. Authorized dealerships are refusing to perform the mandatory firmware updates outlined in manufacturer service bulletins (T-SB-0089-21), opting instead to clear error logs temporarily without repairing the underlying defect. The manufacturer has failed to issue a safety recall despite widespread knowledge of this safety defect.

Filed Apr 21, 2026 · Electrical · WA

There is a parasitic drain on my battery coming from the ECM and electrical system causing it to drain my 12V battery.

Filed Jan 17, 2026 · Electrical · MD

Battery died mid-drive now the radio head unit is in a boot loop rendering all functions unavailable.

Filed Dec 1, 2025 · Acceleration, Driver assistance · CA

While driving the vehicle on an uphill stretch of highway with cruise control set at approximately 65 mph, the vehicle suddenly slowed down without warning. A distinct clunk was heard at the same moment. The cruise control system attempted to restore speed, and the engine became noticeably louder, but the vehicle struggled to return to the set speed. The driver tapped the brake to disengage cruise control and manually pressed the accelerator to resume normal speed. The trip was completed without additional events. After parking, the check engine light illuminated and the cruise control system became disabled on all subsequent drives. No warning indicators were present at the time of the initial failure, and there were no vehicles ahead that would have triggered the collision-avoidance system. Two days later, the vehicle became an intermittent no-start and eventually failed to start entirely. The vehicle was towed to a dealership for inspection. Technicians confirmed an electrical malfunction and reported that the multiplex ECU was likely experiencing an internal short. A parasitic draw test showed an abnormally high current draw of approximately 113 mA, which disappeared when the dome-light fuse and later the multiplex ECU were disconnected. The failure is intermittent and appears to involve an internal electrical short within the multiplex ECU. The sudden loss of cruise control function, abrupt deceleration, and subsequent intermittent electrical behavior created a safety risk, as the electrical malfunction occurred without warning while the vehicle was in motion. The issue was confirmed by a dealership service department.

Filed Nov 3, 2025 · Lights · MI

Headlight Brightness - it's been degrading for the last 10 yrs to the point that I don't feel safe driving in the dark anymore. I've already had the lenses buffed out, but that only helped about 20%. The brightness looks like I have a dead battery (it's brand new). Not sure if this is a bulb or lens issue but it's not safe.

Filed Mar 4, 2025 · Body · MD

Power lift gate not opening and shutting then noted that the mount on the passenger side is partially sheared off the car bracket and starting to separate on the drivers side. Was unable to close the hitch all the way, and beeping continuously while driving so brought to a toyota dealer service who ordered replacement pistons, in the mean time battery died due to being unable to close back. Once piston parts were obtained by toyota service center, had to have the car towed due to battery not able to be charged, then they noticed the bolts starting to shear off. Stated they have never seen anything like this but when looked online, found this has been a common problem and a class action suit has been filed for this exact reason

Filed Jul 18, 2024 · Electrical · NC

PARASITIC BATTERY DRAIN DEFECT complaint: prior to 07/16/2024, I received a "low voltage" error on my Toyota RAV4 screen a few times. On 07/16/2024, I took it to the dealership. My battery tested "good" and the Toyota dealership charged me 39.95 to tell me that everything was working well on my vehicle. The very next day (24 hours later), 07/17/2024, my vehicle would not start and had to be towed to the dealership. The tow truck driver told me the battery was "dead" (based on his measurement) and leaking acid (based on a smell). Toyota charged me 272.52 to replace the battery on 07/18, that was supposedly "good" two days prior. This is a known issue to Toyota, part of a class action lawsuit referred to as "Parasitic Battery Drain Defect." This is dangerous since I was stranded with a car that would not start in a summer day of high heat, but could have been much worse in other circumstances. The tow truck driver told me that the battery acid could be dangerous. Toyota should be providing a fix and a recall, but they had no solution for me other than a new battery which is a "quick fix" (but not a real solution) as described in the Class Action lawsuit documents.

Filed Apr 15, 2024 · Brakes · CO

The ABS and brake booster systems failed, and my traction control was not working as intended. Every light related to the braking system came on all at once and the ability to break became slowed, could not stop if needed to at anything other than a slow decline in speed (wouldn’t be able to go to a full stop without ample planning or control - being cut off, too close to a red light or car needing to turn, or on the highway would’ve ended in an accident). Thankfully was on surface streets both times. Problem was recurrent. Toyota dealership confirmed issue and noted loss of braking power but noted the code was intermittent and failure not definitive, hard to reproduce. Attempted to repair issue, which temporarily worked but re-occurred 1 month later. End result - needed to replace battery, stroke position sensor, brake booster with master cylinder/ABS actuator, which was almost $4,000 in repairs, with no promise it would fix the issue. No warning lamps, signs, or notable symptoms before braking failure. Battery died twice before brakes situation, but attributed to a faulty update system sending data continuously.

Filed Feb 4, 2024 · Electrical, Engine · NJ · fire

When I try to start up my car after a full month of parking as usual I knew already it has a dead battery so I jump started then once it started I heard a very small explosion with smoke coming from underneath the glove compartment then I found a very small fire started from the same place so I left the car and I called 911 who came and extinguished the fire after the entire car was already engulfed and exploded in fire. The car closed the other two cars on both sides to melt partially as well. The picture attached has the incident number.

Filed Jan 28, 2023 · Electrical, Engine · NM

Bought brand new 04/02/2018. First battery died July 2018. First cooling system needed replaced December 2019 due to overheating issues. There has been 7 battery replacements, about two each year, the two most recent was July 2022 and October 31, 2022. Second cooling system replaced December 2022 due to overheating issue. Damaged engine and needed to replace engine. Other issues have been stalling while driving in traffic; stalling while turning and at traffic lights. Was told by Toyota technician that it was due to extremely low oil. I asked why no low oil light came on and he stated it must be damaged but too expensive to repair. My wife and I had our safety at risk due to stalling in traffic and being stranded due to dead batteries. One night we had to sleep in a grocery store parking lot as a tow truck wasn’t available that night. Toyota states they test the batteries and find nothing wrong even after at least two of them exploded and leaked acid. This could have created a fire and/or engine damage. They just keep replacing them over and over. I have estimate from independent repair shop of possible diagnosis for battery issue. I can not have an independent repair shop even move a bolt or warranties will be voided. During the second overheating was told by Geico insurance inspector no codes were found despite overheating had occurred and severe enough to cause engine damage. Never receive any warning lights for any problems that occurred; the problems happen with no warnings. The second overheating issue left us almost freezing to death as we could not make it back home and had to pull over; tow truck was unavailable that night. Have all service records; too many to upload here; files too big. Please contact via email [email protected].