2018 Toyota Highlander: check engine light

Filed Oct 30, 2026 · Transmission · UT

My 2018 Toyota Highlander AWD (75,000 miles) was diagnosed with internal transmission failure on its UA80F 8-speed automatic transmission. The diagnosis confirmed fluid shear and internal metal wear requiring a $9,000+ replacement. The UA80 series is subject to Toyota TSB T-SB-0160-18 and Customer Support Program ZJC for factory assembly flaws involving retaining hardware and bearing wear. Toyota denied goodwill coverage because my VIN falls outside their narrow ZJC date window. Component Failed & Inspection Availability: UA80F 8-speed automatic transmission assembly (powertrain). The vehicle and transmission are intact and available for the federal safety agency or manufacturer inspection upon request. Safety Risk: Premature internal mechanical failure of the UA80F transaxle presents a severe highway safety risk. Gear wear, fluid shear, and bearing failure in this unit can rapidly progress to a sudden loss of forward propulsion, gear slippage, or full transaxle lockup at high speeds, creating an extreme collision hazard. Dealer/Independent Confirmation: Yes. Confirmed by a technician during a professional inspection that documented stored transmission codes (P0741,P2714 & P2757) and a $9,000+ replacement estimate at 75k miles. Manufacturer/Other Inspections: Inspected by an authorized Toyota dealer and escalated to Toyota Customer Experience (Case File Opened). Toyota acknowledged the diagnosis but denied goodwill assistance due to VIN parameters. No police or insurance inspections have occurred. Warning Lamps & Prior Symptoms: A Check Engine Light illuminated, prompting the inspection, but self-cleared before arriving at the dealer. Stored TCM codes confirmed an active failure. This self-clearing behavior masks an active mechanical defect, creating an additional safety hazard.

Filed Jul 28, 2026 · Transmission · ME

This vehicle has a UA80 8-speed transmission that has prematurely failed. This is a KNOWN issue to Toyota and they have refused to provide a fix. It is a safety hazard when all acceleration stops when attempting to merge into heavy traffic (as had happened to me last week) or on a highway traveling at top speed. I have only 27,000 miles on this automobile and it failed with NO WARNING! Within a very short time frame the following occurred: the check AWD system, TRAC off, check engine and the transmission fluid at a high temperature lights appeared on the dashboard. Shortly thereafter I experienced a burning smell, suddenly no acceleration with a high TAC response and vehicle jerking. My transmission is toast. This would have ended very badly for me as it failed on a highway at speed with heavy traffic. Toyota needs to address this and recall and replace. Shame on you Toyota!

Filed Jul 16, 2026 · Acceleration, Engine · TX

While driving my 2018 Toyota Highlander Limited, the check engine light began flashing off and on. I was near an exit and drove off the freeway. I could feel the car (near the gas pedal) start shaking, then the power went down quickly... as I was trying to find a safe place to go. The farther I drove, there was less power until the car was going about 2 miles an hour. The check light continued flashing as I pulled into a parking lot. This was very scary as I'm sure the car would have just stopped on the freeway if I had not been near an exit as it just simply had no power left. (The check engine light has been on over a year and I took it to three different mechanics. Not one could fix it. This car wiped out my savings and now sits at a Toyota dealership)!

Filed Jun 2, 2026 · Transmission · WI

Complaint: I am writing to report a transmission defect in my 2018 Toyota Highlander AWD (UA80 8-speed automatic transmission). Prior to the check engine light illuminating, I noticed a burning smell coming from the vehicle. Subsequently, the following fault codes were retrieved: •P0741 – Torque Converter Clutch Circuit Performance/Stuck Off •P2714 – Pressure Control Solenoid “D” Performance/Stuck Off •P2757 – Torque Converter Clutch Pressure Control Solenoid Circuit Performance/Stuck Off These symptoms are consistent with the known defect described in Toyota’s Customer Support Program ZJC (POL19-04), which acknowledges a manufacturing defect involving an improperly bent washer tab inside the UA80 transmission. However, my VIN was not included in the covered vehicles under this program, despite experiencing identical symptoms. I am also aware that multiple class action lawsuits were filed in December 2025 against Toyota alleging the company knowingly concealed this defect from consumers for years. I am requesting the federal safety agency to investigate whether Toyota’s CSP ZJC coverage should be expanded to include additional affected VINs, and to consider issuing a mandatory recall for all vehicles equipped with the defective UA80 transmission.

Filed May 13, 2026 · Transmission · CT

The transmission went on my 2018 Toyota Highlander. The other day as I was driving on highway, lost power as I was driving in neutral. I went from 70mph to 10 or less mph, would not accelerate. All of a sudden all warning lights. Check AWD, check engine light came on, many messages at once. There were no warning lights displayed prior to this. I was able to get off an exit. Could not move the car anymore was not in a safe area, called police for assistance. The car was towed to an independent service center who confirmed it was a transmission issue.

Filed Feb 8, 2026 · Transmission · IN

Transmission was slipping and hesitating from 50,000 miles up until it went completely out at 96,956. The day it went out, I pulled out onto the highway and there was no acceleration, it wouldn't move. It was flashing "traction control turned off" "check engine visit dealer" "check awd system" and the check engine light was on as well as the orange triangle with explanation point. Toyota said my vin wasn't covered under the TSB, so my extended warranty paid for most, but not all, of the transmisson and parts. They put in a new transmission but the new one does the same thing. It hesitates and slips with currently only 10,000 miles on the new one.

Filed Jan 23, 2026 · Acceleration, Electrical · 200,000 miles · NJ

The contact owns a 2018 Toyota Highlander. The contact stated that while attempting to turn left or right, the steering wheel became difficult to turn. The check engine warning light illuminated, and the vehicle lost power. The contact waited for several minutes before being able to restart the vehicle. The check engine warning light remained illuminated. The failure had occurred several times and had become more persistent. The vehicle was taken to a certified mechanic, who diagnosed that the body throttle, air control system, and battery sensor had failed. The vehicle was repaired; however, the failures persisted. The manufacturer was not informed of the failure. The approximate failure mileage was 200,000.

Filed Jan 17, 2026 · Transmission · NY

TANSMISSION DIED AT 102,000 MILES, 2,000 MILES OVER THE WARRANTY. Toyota said it will pay $6,000 for parts. I HAVE TO PAY TAX AND LABOR. I have been waiting over a MONTH for the parts, while my HIGHLANDER SITS ON THE Toyota DEALER'S LOT IN RIVERHEAD, NY. My wife took the car there, since the "check engine" light had turned on. After the inspection, We were afraid to take it out of the parking lot. Code P275614 torque converter presure control solenoid; faulty transmission problem. Recommended a new transmision for $11,303 plus tax. Many class action suits are being filed about TRANSMISSION PROBLEMS in HIGHLANDERS!

Filed Jan 6, 2026 · Transmission · CA

Transaxle (Transmission) failure. Whining noise then failed while driving freeway. Towed to dealer/mechanic and confirm failure. There was a whining sound but no engine light warnings prior to complete failure. Toyota put out a TSB for this but was never informed - POL19-04. Toyota needs to expand CSP ZJC coverage to all UA80F/UA80E-equipped vehicles exhibiting symptoms, regardless of VIN range.

Filed Jul 1, 2025 · Transmission · MA

The transmission has failed after only 39,000 miles. As a result, the vehicle would not accelerate which lead to a dangerous situation while crossing an intersection. No engine light was shown and no sensors were triggered on the onboard computer so it was impossible to know there was an issue.

Filed Apr 15, 2025 · Fuel system · TX

The fuel pump system is malfunctioning. This vehicle needs to be part of the current recall on 2018 Highlanders with fuel pump issues. This is putting me and my family at risk, as well as others. The code is coming back to the fuel pump. The check engine light is currently on.

Filed Nov 24, 2024 · Transmission · CT

I brought my car to the dealership due to a small whining noise when accelerating over 30mph. Technician determined the noise is coming from internal transmission failure and recommended replacement. The small whining noise was the only indication something was wrong. No check engine or warning lights on my dashboard. The car is under 50,000 miles at the time.