Honda Odyssey misfire problems

Filed Oct 30, 2026 · Engine · WA

Incident: In Mar 2019, while driving down a highway with my family, the vehicle experienced a sudden engine malfunction while driving, characterized by a flashing Check Engine Light, severe engine shaking, and a dangerous, immediate loss of acceleration/engine power. We had to get the vehicle towed to the dealership. A diagnostic scan revealed fault code P0302, indicating a misfire in Cylinder 2. Upon mechanical inspection, the spark plug in Cylinder 2 was completely fouled and covered in engine oil. At this time, only the fouled spark plugs were replaced, and the PCM software updated. This essentially is a temporary band-aid pushing the problem further down the road. The vehicle only had around 87,481 miles, and was a little over 10 years old. The same thing happened again in Dec 2025, at around 147,979 miles. This time, we had to do an extensive and really expensive repair. The root cause was determined to be premature failure of the engine's piston rings. This is a direct result of Honda's VCM system, which shuts down cylinders during operation, creating a vacuum that forces oil past the piston rings, fouling the plugs, and causing unexpected power loss during transit. I wasn't aware of this known issue until I had to do the major repair, and have now realized that Honda is very well aware of this well known and widespread issue. Request: This mechanical failure represents a severe, documented safety hazard that puts occupants at risk of being rear-ended due to sudden deceleration on active roadways. Honda is aware of this exact VCM defect for certain model years. A manufacturing design defect that causes unexpected highway engine failure does not cease to be a safety risk or a corporate responsibility due to age. Honda should have taken proactive steps to mitigate and prevent this issue. I am requesting that Honda reimburse the cost of the engine teardown and piston ring replacement required to make the vehicle safe to operate again.

Filed Sep 29, 2026 · Fuel system · MD

In April of 2025 I had my vehicle towed to O"Donnell Honda because my car was sputtering and inoperable after getting gas a few min prior. The ran codes and got back PO300 PO3054 and PO306 misfires and unknown to me there was an active warranty recall on the fuel injectors. At this time I was withing the warranty period. The dealership told me that I got bad gas and their was nothing wrong with my car. I have spent the last 16 months taking my car back and forth to the dealer trying to figure out what this intermitent problem was with my car. I have at least three visits to the dealer and multiple phone calls with honda over this time. In addition to emails. Most times the code would disappear before I could make it to the dealer. I have also spoken to honda corporate and they have never mentioned this warranty until yesterday I had the issue again and they said it was my fuel injectors and want me to pay $2000 to repair it despite this being a known issues since 4/2025 when my car was withing the warraty period. They said they had no obligation to fix it back in May because they could not recreate the problem but that is not true according to their 21-010 Defect service bulletin. It specifically states they were to replace the fuel injectors. I have documentation to prove all of this. I have spent month and put out additional money on a situation that thye dealership refused to replace a known, warranty-extended safety defect that was officially scanned and documented prior to the 150,000-mile expiration window

Filed Sep 28, 2026 · Engine · IA

My 2016 Honda Odyssey has experienced repeated engine misfires associated with oil-fouled spark plugs. In May 2024, while driving, the check-engine light began flashing and the vehicle ran rough. An authorized Honda dealer inspected the vehicle and documented an oil-fouled spark plug. The dealer replaced all six spark plugs, but the underlying cause was not repaired. In November 2025, the check-engine light returned. An independent repair shop documented code P0303, Cylinder 3 Misfire, and replaced all six spark plugs again. In August 2026, the same problem returned. The repair shop again documented a Cylinder 3 misfire and found all three rear-bank spark plugs fouled. They recommended an internal engine inspection because repeated spark-plug replacement was not correcting the underlying problem. The vehicle was then taken to an authorized Honda dealer, which recommended an engine piston-ring/re-ring repair. The recurring misfire causes the vehicle to run rough and the check-engine light to flash, creating concern about loss of engine performance while driving. The vehicle and engine are available for inspection.

Filed Sep 15, 2026 · Engine, Transmission · KY

The transmission has been having issues since it had 10 miles on it, it locks at certain speeds and wont go higher than 35, it misfires at lights, it will randomly make clunking sounds when driving and you can feel the vehicle throw you forward, ive taken it in multiple times, we have multiple cases open with Honda and they will not respond but it doesnt give any lights so dealership says they cant do anything even though theyve said they have felt it

Filed Sep 13, 2026 · Engine, Transmission · SC

Vehicle began to misfire on cylinder 3. As the issue continued more cylinders stared to misfire. Next was number 6, then 2 increased up the engine. Air fuel ratio was 1.6. Assuming it was fuel/air/electrical in nature, the spark plugs, and fuel injector were changed and air intake and upper valves were cleaned of carbon build up. All gaskets replaced by new. Discovered and replaced a bad egr valve. Last codes that the car displayed before towing to dealer were many misfire codes and 2 engine/transmission communication errors. Dealer shop discovered air fuel ratio of 1.35 and checked all work before. Discovered fuel pooling and some shiny areas in the engine from scoping it. Decided that if was a bad engine with internal failure and transmission. Quoted me $17000 (about the same value as the vehicle if it was jn very good condition) for a new engine and transmission or $6800 for a used engine alone at risk of replacing transmission as well assuming communication errors do not go way or transmission fails further. I have called honda corporate my reference # 16624114. I requested goodwill repair due to recalls and class action lawsuits related to connecting rods in engines of similar cars and model years. And transmissions recalls for similar cars and model years. Goodwill is unlikely but pending.

Filed Aug 6, 2026 · Driver assistance, Engine · 162,600 miles · IA

The contact owns a 2016 Honda Odyssey. The contact stated that while driving 45 MPH, the Forward Collision Warning, Lane Departure Warning, engine, and VSA warning lights were illuminated. While at the stoplight, the vehicle started jerking and sputtering. The contact stated that the failure was related to Technical Service Bulletins: 25-060 and 25-061. The vehicle was taken to the local dealer, where it was diagnosed and determined that there was a misfire coming from the engine. The contact stated that there was oil in the cylinder head. The manufacturer was contacted and opened a case. The manufacturer confirmed that the warranty had expired months earlier, and the case was closed. The failure mileage was approximately 162,600.

Filed Jul 30, 2026 · Engine · OH

I have needed to replace my spark plugs multiple times because of an issue where, apparently when in eco mode, the pistons in the third cylinder flood with oil that causes the spark plugs to misfire. I was informed this is an issue common to Honda Odysseys on or about May 19th, when I was experiencing a misfiring engine and brought it to AAA Reynoldsburg on E Broad Street in Reynoldsburg, OH. Honda is aware of the issue, and when I brought my car to Honda in July, after the new spark plugs started misfiring, one of the people at Honda told me the issue is because of government regulations that require lowering emissions. I don't know if that's objectively true or not, but if it's an issue Honda is aware of, as they are, they should correct the issue without charging me for the 'engine overhaul' or the new spark plugs. I have an email attachment showing the spark plug issue and other issues with the car. I don't hold Honda at fault for some of the issues, but if they know about the underlying cause that contributes to a misfire, I believe they should correct it. The video will not upload, but I am including a link to the video Honda sent me that shows the issues with the car, including the spark plugs misfiring because of one of the pistons flooding with oil. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jul 29, 2026 · Engine · TN

I first experienced an engine misfire in February 2025. The vehicle had a P0301 misfire code, and at the time I was unaware of Honda’s extended warranty related to this issue. We had a trusted mechanic friend inspect the vehicle and replace the spark plugs and ignition coils. He noted that there was significant carbon buildup. After those repairs, the vehicle appeared to run normally, and we believed the issue had been resolved. Later, I received Honda’s extended warranty notice and realized that the issue I experienced may have been related to the condition covered by the warranty. I contacted my local Honda dealership in August 2025 and explained the prior misfire, repairs performed, and the warranty notice I had received. However, because the check engine light was not currently illuminated, I was told there was nothing that could be done unless the vehicle was actively displaying the issue. I also contacted Honda Corporate regarding this matter. I was advised that reimbursement for some of the repairs I had already completed might be possible, but that it would need to be reviewed. I chose not to submit those receipts at the time because I was concerned that doing so might impact my ability to use the extended warranty coverage if the problem returned. Unfortunately, the issue appears to be progressing. On June 2, 2026, the vehicle set a P3400 code, which is related to the Variable Cylinder Management (VCM) system. At that time, the oil level was low. After adding oil and completing several driving cycles, the check engine light turned off. However, the vehicle continues to consume oil at an alarming rate. I have had to add additional oil again in July. The problem is progressing - it is the issue that should be covered by warranty but holds refuses to do anything because the light isn’t currently on,

Filed Jul 28, 2026 · Electrical, Engine · TX

American Honda Motor Co., Inc. issued an official Warranty Extension in July 2025 covering engine misfires from piston ring deterioration (DTCs P0301-P0304) on 2013-15 Pilot and 2013-17 Odyssey vehicles. My 2015 Honda Odyssey (VIN: [XXX]) experienced this exact defect, resulting in severe engine misfires and secondary alternator failure caused directly by engine fluid saturation leaking onto it from the primary defect. I paid $5,275.80 for repairs prior to campaign awareness (Invoices XXX and XXX). I submitted complete reimbursement documentation on January 31, 2026. Honda has withheld my funds for 178 days (which is 122 days past their promised 8 week deadline) while corporate customer care agents falsely claim payment is “approved but pending final management sign- off.” I have called 11 times and corporate managers who are never available HAVE NEVER returned my calls like the representative with Honda I've spoken with each time assures. This deliberate delay subverts federal safety campaign integrity and artificially manages liability exposure. Request immediate enforcement action for an ongoing corporate warranty evasion pattern. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 26, 2026 · Engine · GA

Regarding: Reimbursement Request for Warranty Extension Service (Service Bulletin 25-061) ​I am formally requesting a reimbursement of $1,859.90 for repairs performed on my 2016 Honda Odyssey (VIN: [XXX]). ​On XXX, I visited Phil Hughes Honda in Athens, GA, due to engine misfire symptoms, specifically P0301. The dealership performed repairs in accordance with Service Bulletin 25-061, which included cylinder head disassembly, replacement of piston rings (cylinders 1-3), replacement of spark plugs, and other related services. ​I paid a total of $1,859.90 for these repairs. Given that this service addresses a known defect covered under the manufacturer's extended warranty program for this vehicle, I believe I am entitled to a full reimbursement of these costs. I have attached all relevant service invoices and the final payment receipt as documentation of the services performed and the expenses incurred. I request a review of this claim and the processing of my refund at your earliest convenience. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)