2021 Honda Accord transmission problems

Filed Oct 11, 2026 · Engine, Transmission · AL

I bought my Accord in February of 2026 with only 79k miles (now at 93k). 3 days after purchasing all of these warning lights popped up regarding emissions, brake system, power steering, etc. I brought it back in and they said that it needed a new fuel injector on cylinder one (which didn’t fix the issue). I have replaced all 4 spark plugs and kept up with maintenance since it has been in my ownership. Now I’m having issues with the car going in limp mode, decreased acceleration, decreased mpg, and constant misfire codes! I do not feel safe in this car anymore since it has almost left me stranded as well as it disabling the safety features which could put me at risk. Honda desperately needs to fix this issue seeing as it’s putting their customers at risk, along with others on the road. the federal safety agency please do something!

Filed Sep 2, 2026 · Acceleration, Fuel system · AR

Unable to use cruise control Unable to use lane control Unable to use tire pressure gauge Unable to use auto brake system Car shakes due to a sudden decrease in engine performance. Turbocharger issues Powertrain System issues ECM Failure

Filed Aug 18, 2026 · Electrical, Engine · AL

My car currently has displayed all lights on panel. Went to auto zone to have codes read, shows powertrain-description is code PO299 suggests turbocharger assembly. Safety is put at risk because all of the safety features are now disabled.

Filed May 8, 2026 · Lights, Seat belts · CA

I bought my vehicle around May 2024. Initially, everything seemed fine. However, I noticed that my car was starting to slow down and would enter limp mode, preventing me from exceeding a certain mileage. Subsequently, all the lights on my dashboard began flashing, prompting me to pull over and call a mechanic shop. I had all the necessary maintenance and repairs performed as per the plan. After starting the vehicle, all the lights turned off, and it drove smoothly. A few weeks later, all the lights came back on again, and nothing showed on the OB2 Reader, which I thought was odd because something shouldve popped up if all the lights on my dashboard was going all crazy. The mechanic said the same thing and maybe thought it was the battery, sensors going bad, or even the wiring. But he checked everything and said he didnt find any issues. So I went home and the lights on the dashboard stayed on for 30 seconds and then turned off after I started the car. The lights turning on all at once on the dashboard became more frequent and this time, the check engine light illuminated, indicating a misfiring issue. I took the vehicle to a mechanic shop for a thorough inspection, and they made a few minor adjustments. However, two months later, the same problem recurred. All the lights came on again, and the vehicle misfired once more, accompanied by the check engine light. Upon further investigation, it was discovered that the issue was a head gasket leak. Additionally, the seat belt alert for the passenger and rear seats, as well as the child car seat, failed to function properly.

Filed Mar 24, 2026 · Engine, Transmission · DE

Driving on the highway, my dashboard lit up like a Christmas tree. Car started having white smoke at tail pipe. Check engine lit blink 5 times. Had 4 kids under 14 years old in car. Almost got hit trying to merge over. Turns out misfire cylinder 4. Head gasket. Only 81,000 miles. I have owed 5 months. Car currently at Honda, they want almost 4,400 to repair. But apparently, Honda is aware of these HEAD gaskets going prematurely, in 1.5 l. and has done nothing about it. I do not have the money to repair this car on top of how dangerous it was to be driving on the highway.When this happened.

Filed Mar 14, 2026 · Transmission · CA

A transmission problem occurred shortly after a CVT transmission service was performed at an authorized Honda dealership, Classic Honda of Midland in Midland, Texas. After the service, the vehicle began experiencing abnormal noise, vibration, and harsh driving conditions. The vehicle was later inspected at another authorized Honda dealership, Ocean Honda of Burlingame, California. During the inspection, technicians documented that the CVT transmission fluid had been overfilled and excess transmission fluid had to be drained. After further evaluation, internal transmission damage was identified and the dealership advised that the transmission likely needs replacement. Ocean Honda of Burlingame provided an estimated cost of $10,101.13 for transmission replacement. Attempts were made to resolve the issue directly with Classic Honda of Midland in Texas, but the dealership refused to take responsibility or provide assistance. This condition may create a safety risk due to potential loss of power and unsafe drivability while operating the vehicle.

Filed Oct 25, 2025 · Engine, Transmission · NJ

The head gaskets are known to fail on the 10 generation accord. It failed on my 2021 Honda accord ex-l. I left work and while I was driving the dashboard lit up with every possible light. This was quickly followed by the vehicle losing power on the highway. I ultimately got it repaired by a Honda certified mechanic. The mechanic took it to a Honda dealer to confirm it was the gasket, in which it was. There were no warning lamps message or other symptoms prior to the failure. At the time of power loss I was on an 8 lane highway at 70mph. Luckily no accidents occurred, but the failure definitely put my safety at risk along with others. The mechanic I took my vehicle to has all available information if needed upon request.

Filed Sep 28, 2025 · Electrical, Engine · TX · crash · 2 injuries

This vehicles have a engineering flaw in the design of the head gasket failing prematurely disabling all components of vehicle at any given time wether it’s in the highway or local the car will basically shut itself down causing a major risk for the driver and civilians even death. This is a safety hazard, tragedy waiting to happen y’all should act now theirs multiple and quiet frankly the Corporation should be taking care of it since they are still allowing them out on the road even with knowledge of this issue the customer should not loose their life nor money to a mass production engineering flaw that’s is over seen by the federal safety agency, HONDA. I got in to an accident due to my vehicle not being at 100% because of the head gasket issue the cars availability to detect or use its components, mechanically or electrical.

Filed Mar 1, 2025 · Transmission · NC

Diagnosed with blown head gasket. No warning signs or lights . Car shut off and every light on the dash came on. It’s happening a lot with accords!

Filed Jun 19, 2024 · Electrical, Transmission · CA

As I parked my vehicle all of the dashboard lights turned on simultaneously. My safety is at risk because I can not identify or predict the safety of my vehicle. I have not visited my dealer at this point. I have had a check engine light that would come on and would go away. I’d be told by mechanics that it is a computer issue. My last encounter with this was approximately 2-3 months ago.