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EnginePart report

2021 Honda Accord Engine Problems

Complaints
38about this part
Share
16%of 245 total for the year
Median mileage
133,000miles
Trend
RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.

NHTSA recorded 38 complaints about the engine of the 2021 Honda Accord, 16% of the 245 complaints for this model year. Where a mileage was given, the median is 133,000 miles. 3 of these say a crash was involved, according to the filers.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“First of all started with small coolant missing, later on I started noticing power loss and finally white smoke out the exhaust. Blown Head Gasket. Honda need to own up on defect engine design the ford did awhile back. Those slits between the cylinder was a big mistake. I myself is doing the repair. 2021 Honda Accord Sport 2.0 with mods and tuned”

NHTSA complaint #11749905, filed 2026-07

“Vehicle accelerated on its own and propelled the vehicle over a curb and into a building. This occured even though the gear shift was in the Park position. My grandchild and I were thrown forward as vehicle hit the building. Vehicle has not been inspected since incident occurred just yesterday, 11/20/2025. No warnings preceded the incident,”

NHTSA complaint #11700745, filed 2025-11

“Head Gasket Blown i had a diagnosis ran at the honda dealership and it came back as a blown gasket its Preventing me to accelerate whole on the highway im going at high speeds and it slows down like im slmming on brakes”

NHTSA complaint #11691826, filed 2025-10

“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! …”

NHTSA complaint #11770383, filed 2026-10

“My car ran hot for the first time and I was told my head gaskets were blown and I needed a new radiator. Once I got that repaired I was then told my transmission cooler went bad on my car which caused my engine to run hot and blow my gaskets in addition to cracking my radiator. I keep my car serviced as required with the Honda dealership and they had advised seeing this same issue in several other vehicles like mine. My car has less than 100k miles and I am the only owner. It has never given me ANY warning lights. …”

NHTSA complaint #11688736, filed 2025-09

Related service bulletins

Engine: other model years

YearComplaintsShare of year
202617%
202522%
2024117%
20231113%
20223212%
20213816%
20207320%
201918527%
201855929%
20176212%
2016447%
201510618%
201417918%
201317913%
20124312%
2011258%
201011620%
200911115%
200821014%
2007296%
2006215%
2005294%
2004283%
2003513%
2002192%
2001142%
2000111%
1999282%
1998182%
1997102%
199610%
199510%
199421%
199321%
199221%

Other parts of the 2021 Honda Accord

Electrical system
68 complaintsForward collision avoidance
62 complaintsOther or unknown
58 complaintsBrakes
31 complaintsFuel system
17 complaintsAir bags
15 complaintsLane departure
15 complaintsTransmission and drivetrain
14 complaintsVehicle speed control
9 complaintsSteering
8 complaintsSeat belts
6 complaintsVisibility (wipers, defrost, mirrors)
5 complaints

← All problems reported for the 2021 Honda Accord

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology