2015 Honda Odyssey: misfire or rough idle

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 May 15, 2026 · Engine · WI

I had an engine failure on my odyssey that was causing a single piston to misfire - that i then had a honda dealer repair for around $3500. A couple months later i received a letter indicating this specific type of error was now under a recall for my vehicle so i submitted all the documentation for the recall reimbursement. That was in August of 2025 and I have still not received reimbursement - each time I contact Honda i am told this is just the normal process but nobody is able to provide me a date of when it will be reimbursed.

Filed May 1, 2026 · Engine · WI

I bought this car from a dealer in November of 2025 just over 95k miles. Two weeks after I bought it a PO303 code for a cylinder 3 misfire appeared. I changed the spark plug and the code went away. Then on Friday, April 10th, the code came back. I replaced the spark plug for a 2nd time. The code disappeared again. Then, on April 25th the code returned and I replaced the cylinder 3 spark plug for the 3rd time. After replacing the cylinder 3 plug for the 3rd time I took the car to an auto mechanic in my area. After their diagnosis I am looking at either repairing the current engine at a cost of 4500 dollars or replacing the engine at a cost of 7-8k. I believe my engine issue is the very same issue that 2011-2013 3.5l v6 Honda engines suffer from that resulted in a lawsuit and settlement.

Filed Apr 3, 2026 · Engine · NY

In November 2024, the engine of my 2015 Honda Odyssey misfired and I had all spark plugs replaced. The vehicle had 102, 171 miles on it. The issue was resolved at that time. On April 1, 2026 the engine misfire returned, check engine light came on and the repair shop advised that again the engine is having the same issue. The vehicle now has 117,000 miles on it. This does not appear to be an isolated case as I have read several other similar complaints.

Filed Mar 27, 2026 · Engine, Transmission · OR

Approximately 7 months ago, my 2015 Honda Odyssey experienced an engine misfire with code P0302 (cylinder 2). All spark plugs were replaced at that time and the issue appeared resolved. However, the misfire has now returned with the check engine light on, again indicating cylinder misfire. The vehicle only has 71,000 miles on it, which makes this recurring issue particularly concerning. Based on my research, this appears to be a known defect related to Honda’s Variable Cylinder Management (VCM) system causing excessive oil consumption and spark plug fouling — an issue documented across 2013–2017 Odyssey vehicles and addressed under Honda Service Bulletin 25-061. I am requesting this complaint be on record and urge the federal safety agency to investigate this as a safety-related defect.”

Filed Feb 5, 2026 · Engine · WA

Honda issued a warranty extension covering piston ring deterioration that causes engine misfires (DTCs P0301–P0304) due to oil fouling. I experienced this exact condition on 3/11/25 prior to issuance of the warranty extension, resulting in an engine misfire and loss of drivability. To restore basic operation of the vehicle, an independent repair facility replaced a fouled spark plug, documenting the misfire and oil fouling condition (including the P0301 code). I elected the minimum necessary repair to restore drivability, as the warranty extension had not yet been issued and the vehicle could not be operated safely without immediate service. Honda has acknowledged that this repair was temporary and consistent with the covered condition. Honda has denied reimbursement for this repair because the piston ring or short block replacement identified in the campaign was not completed. Honda has also stated that it will not perform the covered repair unless the misfire code is currently active or stored and the check engine light is illuminated. Honda representatives have acknowledged that this condition commonly recurs after a temporary spark plug repair, but have advised that no repair can be performed unless the issue resumes. This creates a situation in which the vehicle has a known covered defect, but access to repair is delayed until failure reoccurs, potentially outside the warranty extension mileage or time limits. I am submitting this complaint due to concerns that these requirements may prevent timely access to emissions-related repairs for a known defect and may discourage reasonable interim repairs necessary to maintain safe vehicle operation. Honda’s requirement that I continue operating the vehicle until the misfire reoccurs raises safety concerns. The prior failure resulted in loss of drivability, and I am uncomfortable transporting my family while knowingly operating a vehicle with a documented defect that Honda has acknowledged is likely to recur.

Filed Oct 3, 2025 · Engine · NC

American Honda Motor Co, Inc. recently sent a warranty extension due to piston ring deterioration causing misfires. They have improperly denied my claim for reasons that were clearly arbitrary and to get out of reimbursing me for the repair. This is a safety concern because the car is unable to accelerate safely to merge onto an interstate and puts other drivers at risk.

Filed Aug 22, 2025 · Engine · 92,000 miles · MD

The contact owns a 2015 Honda Odyssey. The contact stated that while driving at night, the check engine warning light started flashing. The contact was able to pull over. The contact called a mobile mechanic who determined that there was a misfire in cylinder #1, and that the spark plugs needed to be replaced. The spark plugs were replaced, but additional repairs were needed. The vehicle was taken to the local dealer where it was diagnosed and determined that the spark plugs, and piston rings needed to be replaced. The vehicle was repaired. The manufacturer was contacted and determined that there was no warranty coverage for the failure, and no assistance was provided. The approximate failure mileage was 92,000.

Filed Aug 11, 2025 · Engine, Transmission · IL

I am reporting an engine defect covered under Honda’s recent warranty extension for 2013–2017 Odyssey / 2013–2015 Pilot vehicles when the MIL comes on with DTCs P0301–P0304. On November 1, 2022, I was stranded on the road when the check-engine light came on. At Honda Muller of Gurnee, the dealer diagnosed misfires consistent with P0301–P0304, explaining the underlying cause as piston ring function deterioration with sludge causing oil to foul the spark plugs. I was told my original warranty had expired only about six weeks earlier (on August 29, 2022). Coverage was denied and I was quoted over $6,000. Because I couldn’t afford the repair, the dealer recommended replacing the spark plugs as a temporary measure only, stating this would not fix the underlying defect. I proceeded with that temporary measure. On November 11, 2022, American Honda formally acknowledged my concern in writing, confirming that Case #13455791 had been opened and escalated to a case manager in direct response to my diagnosis from November 1, 2022. Despite this acknowledgment, my repair request was denied. In 2025 I received Honda’s warranty extension letter acknowledging coverage for this exact defect (including coverage through January 31, 2026). I returned to the dealer seeking repair based on my documented diagnosis, but repair was refused again because the codes were not present that day (the condition is intermittent). This defect affects drivability and safety (loss of power/hesitation and reduced ability to merge or cross traffic). I am asking the federal safety agency to record this complaint and consider action so that owners with documented prior diagnoses — especially those recognized by Honda corporate — are not refused repairs simply because an intermittent defect isn’t active at the exact moment of inspection. I am reporting an engine defect covered under Honda’s recent warranty extension for 2013–2017 Odyssey / 2013–2015 Pilot vehicles when the MIL comes on with DTCs P0301–P0304.

Filed Aug 7, 2025 · Engine · GA

On March 27th, I was driving my car. My children were with me and we were on the way home from swim practice. With no warning, my engine went crazy. We were sitting at a stop light and the idel became very rough shaking the entire car. The engine was slow to respond to the accelerator and ultimately I decided that it was not safe to drive. I had my van towed to my mechanic who ran diagnostics and confirmed that the spark plugs were misfiring because of oil build up related to a faulty piston ring valve. He explained that it was a common problem with Odysseys. He gave us the options of doing the major repair of the rings that would cost about $5000 or we could replace the failing spark plugs and get 6-8 months out of the car before the same issue would reoccur. Not having a spare $5k on hand we opted for the temporary fix. I recently received a warranty extension from Honda about this exact issue but Honda is refusing to repair my car. They have told me that unless the engine light is on and the appropriate codes are indicated, I can not have the repair covered by the warranty. I took in documents from my mechanic with pictures of the codes, but they will not honor this. They also said that even if they did an inspection that confirmed the piston ring failure, Honda USA would not pay them back for the repairs because the service light and appropriate service codes are not showing. I believe the terms of this warranty extension are in bad faith and put me and my family at risk. Either I spend my own money to repair the car, or I wait until the engine fails and me and my family are stranded on the side of the road. Despite numerous conversations with the service member and customer service, Honda refuses to put in writing their refusal to repair my car under the warranty.

Filed Jul 24, 2025 · Engine · OH

My vehicle has a know issue with Honda Corporate with the variable cylinder management that has lead to 7 miss fires in 4 years. The frequent and excessive miss fires are caused by carbon and oil leaking through the piston rings. Honda has attempted to repair the piston rings but that repair was a fail. I’ve experienced a miss fire after the repair and now require another change to my spark plugs recommended by Honda. I filed a reimbursement case with Honda and was notified they will not resolve the issue or reimburse me for the excessive miss fires, spark plug and coils replaced due to their faulty know engine defect. They announced in July 2025 that they were extending the warranty to cover repairs related to engine misfires (DTCs P0301 through P0304) and will last for 10 years from the original purchase date or 150,000 miles. However they have denied my reimbursement after sending proof of miss fire work and payment.