Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2020 Toyota Corolla owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2020 Toyota Corolla. The contact stated that while driving at an undisclosed speed, the vehicle emitted an abnormal slushing sound. There was no warning light illuminated. The contact stated that upon parking and inspecting the vehicle, he noticed that the abnormal sound was coming from the front driver's side door. The contact then moved each door of the vehicle from side to side and noticed that the failure occurred on the front passenger's side door and the front and rear driver's side doors. The vehicle was taken to the dealer on several occasions and the water was drained from the doors; however, the vehicle was not diagnosed. The manufacturer was notified of the failure and informed the contact that they would cover the repair of the vehicle. The contact stated that it had been two months and the vehicle had not been diagnosed or repaired. …
The contact's mother owns a 2020 Toyota Corolla. The contact stated that while looking in the list of features on the infotainment center, the Forward Collision, Brakes, Accelerator, Lane Assist, On-Board Collision, and other safety features were flagged as malfunctioning. The contact stated that the list of malfunctioning systems seemed to have increased over time. The vehicle failed to turn off intermittently, causing the driver to make several attempts to turn off the vehicle. The vehicle was not taken to the dealer to be diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was 80,000.
The contact owns a 2020 Toyota Corolla. The contact stated that while driving at an undisclosed speed, a "Maintenance Required" message was displayed, and the front passenger air bag warning light illuminated. The speedometer was inoperable. The contact stated new tires had been installed previously. The vehicle was taken to the dealer; however, the vehicle was not yet diagnosed. The contact associated the failure with NHTSA Campaign Number: 23V865000 (Air Bags); however, the VIN was not included. The manufacturer was notified of the failure by telephone. The failure mileage was approximately 67,000.
The contact owns a 2020 Toyota Corolla. The contact stated that after the vehicle was started, the contact started driving, and a voice message was heard coming from the speaker on the driver's side door, stating that the communication module had failed. The vehicle was taken to the dealer, where it was diagnosed, and determined that the Data Communication Module needed to be replaced. The vehicle was not repaired due to the cost. The manufacturer was informed of the failure. The failure mileage was approximately 38,000.
The contact purchased a 2020 Toyota Corolla. The contact stated that they discovered a mileage discrepancy after the purchase. The vehicle was a private sale on Facebook market. At the time of purchase, the vehicle mileage was 52,000. It was later discovered that the vehicle's title mileage was 132,000. The contact stated went the DMV, and he discovered the mileage 132,483.
The contact owns a 2020 Toyota Corolla. The contact stated that while operating the vehicle, the message "Communication Module Failure" was activated. The cause of the failure was not yet determined. The local dealer and the manufacturer were contacted regarding the failure, but no assistance was provided. The failure mileage was 37,000.
I am experiencing a recurring issue with the Data Communication Module (DCM) in my 2020 Toyota Corolla. This component was previously subject to a recall, which I addressed at a dealership. However, the problem persists, and many other Toyota owners, including those with RAV4 models, are reporting similar issues. Discussions on forums such as Toyota Nation and Toyota Owners Club highlight these ongoing concerns. My vehicle is out of warranty, and replacing the DCM is estimated to cost over $800. I have confirmed that the issue lies with the DCM system, as removing the corresponding fuse eliminates the error message on the multimedia system. However, this circuit also powers the right speaker and microphone, making it impractical to simply disconnect the module. The local dealership has quoted $205 for diagnostics, despite my prior identification of the problem. …
Rear passenger door on left side of vehicle fills with water everytime it rains or vehicle is washed. This is causing the body to prematurely rust and it's also sloshing onto electrical components in door which I fear can cause unpredictable and unforseen components to fail. Also beginning to cause an odor on the interior of vehicle. The vehicle was taken to the dealership from which it was purchased and they simply pulled a rubber stopper from bottom of door and stated that was the only remedy approved and provided through Toyota. Since said remedy was applied door has plugged on three more occasions and was taken back to dealership on only one of the subsequent incidents at which time was told by a service personnel again that to pull the rubber stopper from bottom of door was their only means of repair. Which was also on the day of that this was written and reported. …
when I use blinker windshield wipers turn on and sometimes when I call or somebody calls my cell phone I can hear them, but they cannot hear me. does not happen all the time, but I was concerned since there was a recall on certain toyota corolla that says a short circuit may develop in the OCS sensor, preventing front passenger air bag from deploying and my son who is a mechanic said both of these could be a problem with the wiring in the column and I thought it may be connected to the same recall as the air bags? the wipers coming on is happening more often these days and that is why I mentioned it to my son who is a mechanic. he will not touch it since it is still under my extended protection but he is concerned about it getting worse since the blinker is attached to the column. …
I am unable to lock or unlock the driver's side door of my 2020 Toyota Corolla using the key fob because the door lock actuator is no longer functioning properly. I must manually use the physical key to lock and unlock the driver's door. I consider this a significant safety concern because the power locking system is no longer functioning as intended, potentially affecting my ability to quickly secure or access the vehicle, particularly in an emergency. I have contacted Toyota directly to report the issue and request assistance with the repair, but Toyota is currently declining to cover the repair. I am proceeding with having the vehicle repaired independently because I need the door lock system restored to proper working condition. I have also learned that other Toyota owners have reported similar premature failures involving the door lock actuator. …
Electrical complaints in other Corolla years
Frequently asked questions
How common are electrical problems on the 2020 Toyota Corolla?
NHTSA has 35 complaints about the electrical system of the 2020 Toyota Corolla, 11% of the model year's 313 complaints. The component named most often is instrument panel › speedometer/odometer (2 mentions).
Is there a recall for 2020 Toyota Corolla electrical problems?
No. NHTSA lists no electrical system recall for the 2020 Toyota Corolla, though it has 5 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2020 Toyota Corolla electrical problems start?
Half of the complaints with a recorded mileage happened before about 38,000 miles, and 36% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 1 fire and 0 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.