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2018 Toyota Yaris iA Owner Complaints

Updated May 30, 2026
Ethan Miller
2018 Toyota Yaris iA Owner Complaints

Complaint Summary

The 2018 Toyota Yaris iA has 11 reported complaints.

  • Top issues involve unknown or other and vehicle speed control.

Reliability Score

Reliability Score

9.5/ 10

Based on 11 complaints

Most Frequent Issues

UNKNOWN OR OTHER

2 18.2%

VEHICLE SPEED CONTROL

1 9.1%

TIRES:TREAD/BELT

1 9.1%

AIR BAGS

1 9.1%

SEAT BELTS

1 9.1%

Quick Insights

  • The top category is UNKNOWN OR OTHER, accounting for 18.2% of all complaints.

  • Owners have reported issues across 10 distinct vehicle systems.

  • Note: Complaint data reflects owner reports and may not always indicate a verified defect. Compare with Recalls and TSBs for a complete picture.

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Complaint Summary

What owners keep reporting on the 2018 Toyota Yaris iA

The 2018 Toyota Yaris iA has 11 owner complaints in this dataset. UNKNOWN OR OTHER is the most common complaint category, representing about 18% of the reports shown here.

Most common complaint categories

The top complaint groups for the 2018 Toyota Yaris iA are UNKNOWN OR OTHER (2), VEHICLE SPEED CONTROL (1), TIRES:TREAD/BELT (1).

Are these complaints a serious red flag?

Potentially. 4 complaint reports involve higher-attention systems like brakes, steering, engine, powertrain, fuel, suspension, airbags, or electrical components, which is enough to justify a focused inspection.

What should buyers inspect on a used 2018 Toyota Yaris iA?

Start with the top complaint systems, compare them against the recall report, then inspect service records for evidence that those same areas were already repaired or monitored.

Read the full buyer guideRecall report and remedy notesMaintenance costs and intervals2017 Yaris iA complaints2019 Yaris iA complaints

Detailed Complaint Log

Showing 10 of 10 systems

UNKNOWN OR OTHER

2 Reports18% of total

Previewing the first 2 complaint summaries.

MY TRACTION CONTROL GOES CRAZY EVEN WHEN THE WEATHER IS NICE. WHEN DRIVING THE TRACTION CONTROL WILL START BLINKING AND TURN OFF. MY SAFETY RESTRAINT SYSTEM HAS AN ERROR AND MY SEAT BELT LATCH IS BROKEN. THEY SAID THEY WOULD NOT FIX IT BECAUSE ITS NOT AN ISSUE. MY CAR MAKES LOUD BEEPS WHEN I START. MY KEYLESS ENTRY HAS MALFUNCTIONED SINCE 2 MONTHS AFTER I BOUGHT IT IN DEC OF 2018. THEY WANT TO CHARGE ME TO "LOOK AT IT". IT SAYS THERE ARE NO KEYS IN THE VEHICLE WHEN I AM DRIVING. MY AIRBAGS ARE MALFUNCTIONING. IT IS NOT REGISTERING PEOPLE SITTING IN THE VEHICLE. WHEN DRIVING DOWN THE ROAD IT FLASHES THAT THE AIRBAGS ARE OFF. I WEIGHT 220LBS I AM MORE THAN ENOUGH TO SET THAT SENSOR OFF AND WHEN I DRIVE IT WILL NOT ENGAGE.

4/8/2021

Over corrected, hit a tree, flipped car 2x landed upside down white smoke started filling in the car and went completely engulfed in flames within a few minutes.

11/27/2024

VEHICLE SPEED CONTROL

1 Report9% of total

Previewing the first 1 complaint summaries.

CRUISE CONTROL SPEED DOES NOT MATCH SPEEDOMETER TOYOTA ADMITS THERE IS A PROBLEM, BUT THERE IS NO FIX. TOYOTA CASE #[XXX] PAT LOBB TOYOTA VISIT 8-24-19 INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TT PAT LOBB TOYOTA VISIT 9-3-19 TOYOTA OF PLANO VISIT 9-15-19

10/6/2019

TIRES:TREAD/BELT

1 Report9% of total

Previewing the first 1 complaint summaries.

TL* THE CONTACT OWNS A 2018 TOYOTA YARIS IA EQUIPPED WITH TOYO TIRES, TIRE LINE: PROXES A27, TIRE SIZE: P185/60R/16, DOT NUMBER: (NOT PROVIDED). THE CONTACT STATED WHILE DRIVING AT VARIOUS SPEEDS THE TIRES LOSS AIR WITHOUT WARNING. THE CONTACT ADDED AIR TO TIRES. THE LOCAL DEALER WAS NOT CONTACTED. THE VEHICLE WAS NOT DIAGNOSED NOR REPAIRED. THE CONTACT STATED THAT THE FAILURE WAS LIKE NHTSA CAMPAIGN NUMBER: 19T004000 (TIRES). THE MANUFACTURER WAS NOT CONTACTED. THE FAILURE MILEAGE WAS 38,789. THE VIN WAS NOT AVAILABLE.

12/21/2020

AIR BAGS

1 Report9% of total

Previewing the first 1 complaint summaries.

MY TRACTION CONTROL GOES CRAZY EVEN WHEN THE WEATHER IS NICE. WHEN DRIVING THE TRACTION CONTROL WILL START BLINKING AND TURN OFF. MY SAFETY RESTRAINT SYSTEM HAS AN ERROR AND MY SEAT BELT LATCH IS BROKEN. THEY SAID THEY WOULD NOT FIX IT BECAUSE ITS NOT AN ISSUE. MY CAR MAKES LOUD BEEPS WHEN I START. MY KEYLESS ENTRY HAS MALFUNCTIONED SINCE 2 MONTHS AFTER I BOUGHT IT IN DEC OF 2018. THEY WANT TO CHARGE ME TO "LOOK AT IT". IT SAYS THERE ARE NO KEYS IN THE VEHICLE WHEN I AM DRIVING. MY AIRBAGS ARE MALFUNCTIONING. IT IS NOT REGISTERING PEOPLE SITTING IN THE VEHICLE. WHEN DRIVING DOWN THE ROAD IT FLASHES THAT THE AIRBAGS ARE OFF. I WEIGHT 220LBS I AM MORE THAN ENOUGH TO SET THAT SENSOR OFF AND WHEN I DRIVE IT WILL NOT ENGAGE.

4/8/2021

SEAT BELTS

1 Report9% of total

Previewing the first 1 complaint summaries.

MY TRACTION CONTROL GOES CRAZY EVEN WHEN THE WEATHER IS NICE. WHEN DRIVING THE TRACTION CONTROL WILL START BLINKING AND TURN OFF. MY SAFETY RESTRAINT SYSTEM HAS AN ERROR AND MY SEAT BELT LATCH IS BROKEN. THEY SAID THEY WOULD NOT FIX IT BECAUSE ITS NOT AN ISSUE. MY CAR MAKES LOUD BEEPS WHEN I START. MY KEYLESS ENTRY HAS MALFUNCTIONED SINCE 2 MONTHS AFTER I BOUGHT IT IN DEC OF 2018. THEY WANT TO CHARGE ME TO "LOOK AT IT". IT SAYS THERE ARE NO KEYS IN THE VEHICLE WHEN I AM DRIVING. MY AIRBAGS ARE MALFUNCTIONING. IT IS NOT REGISTERING PEOPLE SITTING IN THE VEHICLE. WHEN DRIVING DOWN THE ROAD IT FLASHES THAT THE AIRBAGS ARE OFF. I WEIGHT 220LBS I AM MORE THAN ENOUGH TO SET THAT SENSOR OFF AND WHEN I DRIVE IT WILL NOT ENGAGE.

4/8/2021

SERVICE BRAKES

1 Report9% of total

Previewing the first 1 complaint summaries.

I’m reporting a vehicle safety problem. My 2018 Toyota Yaris IA just had a mileage of 823 miles and was within the warranty time and had a brake system problem caused by the Toyota car quality problem. On August 22 (Sunday), 2021 about 1:00 pm I, with my wife, was going to drive my 2018 Toyota Yaris IA to my daughter’s house to see our five grandchildren as we did since April when we had covid 19 vaccine. When I started the car in my house parking lot, I was surprised to find several indicators of the brake system malfunction were on the car’s computer screen. Not only did the indicators still exist in the screen, I felt the car was shaking when I was driving about 30 feet. I immediately returned back to my house parking lot and found a new problem that the air conditioning didn’t work either. I decided not to drive this car. The next day, August 23 about 7:00 am, I drove to Oakton Sonoco Auto Service Center. There, Jim, the manager, found the same indicators of the brake system malfunction, he at once told me, “Your car just has 800 mileages and is under warranty. You should drive to the Toyota dealer immediately.” Then I drove to Ourisman Fairfax Toyota at about 7:25 am and told Mr. Carroll Hyman about the car problems. At about 4:00 pm he called me and said, “Mice bit and broke the wires to damage the wire system. Your car’s repairing can not have the warranty.” I asked, “Did you see the mice?” He answered, “Yes, the mice were in the wires close to the engine”. He didn’t mention whether the mice were alive or dead. If the mice were alive when he saw them, how could the mice be still there after about 18 hours including 20 minutes suffering heat, noise and vibration created by the working engine? If the mice were dead when he saw them, while I was driving several miles , the engine chatter and inertia of the moving body of the car already threw away dead mice into the road, how could he see them still there? His saying contradicts the facts.

1/25/2022

ELECTRICAL SYSTEM

1 Report9% of total

Previewing the first 1 complaint summaries.

The contact owns a 2018 Toyota Yaris IA. The contact stated while driving at an undisclosed speed, the Forward Collision Avoidance and TPMS warning lights illuminated. The contact stated that the accelerator pedal was depressed however, the vehicle failed to respond. The contact stated that she depressed the brake pedal however, the vehicle failed to respond. The vehicle stalled and stopped independently. The contact veered to the side of the road. The contact was unable to restart the vehicle after several attempts. The vehicle was towed to the dealer where unknown repairs where completed. However, the failure reoccurred while driving. Additionally, the contact stated that the vehicle failed to start after several attempts. The contact jumpstarted the vehicle and the vehicle restarted as needed. The check engine warning light was illuminated. The vehicle was taken to a local Pep Boys where it was diagnosed that the failure was associated to the engine control module. The dealer and the manufacturer were notified of the failure and informed the contact that the vehicle only had a power train warranty. The vehicle was not repaired. The failure mileage was approximately 26,000.

6/24/2022

ENGINE

1 Report9% of total

Previewing the first 1 complaint summaries.

The contact owns a 2018 Toyota Yaris IA. The contact stated while driving at an undisclosed speed, the Forward Collision Avoidance and TPMS warning lights illuminated. The contact stated that the accelerator pedal was depressed however, the vehicle failed to respond. The contact stated that she depressed the brake pedal however, the vehicle failed to respond. The vehicle stalled and stopped independently. The contact veered to the side of the road. The contact was unable to restart the vehicle after several attempts. The vehicle was towed to the dealer where unknown repairs where completed. However, the failure reoccurred while driving. Additionally, the contact stated that the vehicle failed to start after several attempts. The contact jumpstarted the vehicle and the vehicle restarted as needed. The check engine warning light was illuminated. The vehicle was taken to a local Pep Boys where it was diagnosed that the failure was associated to the engine control module. The dealer and the manufacturer were notified of the failure and informed the contact that the vehicle only had a power train warranty. The vehicle was not repaired. The failure mileage was approximately 26,000.

6/24/2022

TIRES:SIDEWALL

1 Report9% of total

Previewing the first 1 complaint summaries.

This is a safety issue that needs to be addressed. I informed the Manufacturer , Yokohama, as soon as the incident occurred and had to be replaced by a tire shop. These tires can explode if they hit anything, on the side, at less than 2mph (two miles per hour).

2/14/2024

TIRES:BEAD

1 Report9% of total

Previewing the first 1 complaint summaries.

This is a safety issue that needs to be addressed. I informed the Manufacturer , Yokohama, as soon as the incident occurred and had to be replaced by a tire shop. These tires can explode if they hit anything, on the side, at less than 2mph (two miles per hour).

2/14/2024

About This Data

Data and Methodology

Sources
Show 5 sources
  • edmunds.com
  • cars.com
  • toyotaofroswell.com
  • asburyauto.com
  • vinitel.com
MethodologyHow we score →

Scores are derived from NHTSA recalls and owner complaints, normalized by vehicle segment averages.

FAQ

What are the most common owner complaints for the 2018 Toyota Yaris iA?

The most reported complaint category for the 2018 Toyota Yaris iA is UNKNOWN OR OTHER, with 2 owner reports. That is about 18% of all complaints logged here. Other recurring themes include UNKNOWN OR OTHER, VEHICLE SPEED CONTROL, TIRES:TREAD/BELT.

Are complaints about the 2018 Toyota Yaris iA a serious warning sign?

Potentially. 4 complaint reports fall into higher-attention systems such as brakes, steering, engine, powertrain, fuel, suspension, airbags, or electrical components. That does not prove every vehicle has a defect, but repeated complaints in those systems justify a more careful pre-purchase inspection.

How should buyers use complaint data for the 2018 Toyota Yaris iA?

Use complaints as an early pattern to investigate, not a standalone verdict. Start with the top complaint categories, compare those themes against the recall report and maintenance guide, then inspect service records for evidence that the same problem areas were already addressed. If the same issue appears repeatedly across complaints and recalls, treat it as a real ownership-risk flag.

Are complaints about the 2018 Toyota Yaris iA severe?

4 complaint reports involve higher-attention systems such as brakes, steering, engine, powertrain, fuel, suspension, airbags, or electrical components, which is enough to justify a focused inspection before purchase.

Complaint list entries are sourced from owner-submitted NHTSA ODI records.

Read complaint summaries

Toyota Yaris iA: How should complaint data influence buying decisions?

Use complaint patterns together with recalls and maintenance guidance to estimate ownership risk and inspection priorities.

Carfocal links complaint data directly to recall and maintenance routes for the same model year.

Return to full vehicle report
Complaint entries
11
Top-topic view
5 grouped topics shown
Primary source
NHTSA ODI owner complaint records

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In this guide

  1. 01Overview
  2. 02Common Problems
  3. 03Owner Complaints
  4. 04Data and Methodology

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