Honda
Odyssey

Vcm problems burn oil and misfire code

For several years now, we have misfire issue or code P0304. We continue to change spark plugs cylinders. Both usually last a year or so then they need replaced again. I research the problem, no recall or the like. I did see his report on-line, wondering if it applies to us, Warranty Extension: MIL Comes On with DTCs P0301 thru P0304. Any help would be greatly appreciated.

Dear NHTSA Advisor, Thank you for regarding my request for warranty coverage for the critical misfire and overheating defect with my 2012 Odyssey Honda Engine 3.5L Engine. Odyssey, as described in Honda’s Service Technical Bulletin 13-081. I must reiterate the severity of my situation: the part required for repair is quoted at $7,500.00—and that does not include labor. This amount far exceeds the current market value of my vehicle, effectively making it impossible to afford repairs without Honda’s intervention, it’s aSafety Defect & Known Manufacturer Issue. The misfiring and overheating problems represent major safety risks for my family and anyone who operates the vehicle. This is not routine maintenance, but a substantial defect that Honda has addressed in its own technical bulletin. I have adhered diligently to Honda’s maintenance schedule throughout my ownership. Attached to this correspondence is a PDF containing the complete Service Technical Bulletin 13-081. I am prepared to provide any additional documentation upon request. WARRANTY EXTENSION: MIL COMES ON WITH DTCS P0301 THRU P0304 TECHNICAL SERVICE BULLETIN Reference Numbers): 13-081, Date of Issue: October 08, 2020 HONDA: 2011-13 Odyssey Superceded Bulletin(s): 13-081, Date of Issue: June 18, 2019 Aug 5, 2025 License: Odometer: NOTE: Supersedes 13-081, dated June 18, 2019, to revise the information below. AFFECTED VEHICLES AFFECTED VEHICLES Year Model Trim Level VIN Range 2011-13 Odyssey ALL Check the iN VIN status for eligibility. REVISION SUMMARY Under CUSTOMER NOTIFICATION, outdated information was removed. CORRECTIVE ACTION 2011 Models: Complete diagnosis procedure and if necessary, update PCM software (Procedure A) , replace affected spark plugs then clean pistons and replace the piston rings (Procedure B) • 2012-13 Models: Complete diagnosis procedure, replace affected spark plugs then clean the pistons and replace the pistons rings (Procedure B). No need for software update as 2012-13

The contact owns a 2012 Honda Odyssey equipped with Cooper Tires, Tire Line: CS5 Grand Touring, Tire Size: P235/65/R17, DOT Number: (N/A). The contact stated while driving 70 MPH, the vehicle started to vibrate abnormally. The driver was able to pull over safely and became aware of a blowout of the front passenger’s side tire. There were no warning lights illuminated. The contact stated that while driving 70 MPH, there was an abnormal vibration in the steering wheel. The vehicle was taken to a tire center where it was determined that the failure was linked to a busted tire core. The damaged tire and driver's side rear tire were replaced. The contact stated that while continuing to drive, the steering wheel and the vehicle continued to vibrate. The vehicle was taken to a tire center, where it was determined that the driver's side front tire had a shifted radial belt, and a bulge was detected. The tire was replaced. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted, but no assistance was provided. The vehicle failure mileage was approximately 79,694. The tire mileage was approximately 20,000.

Odometer Fraud. The contact purchased a 2012 Honda Odyssey. The contact stated that while attempting to register the vehicle, it was discovered that there was a mileage discrepancy. The vehicle was a private sale. At the time of purchase, the vehicle mileage was 130,000, and at the time of registration, it was discovered that the mileage was 230,000. Local authorities had been notified.

vehicle loses acceleration power intermittently. No response when pressing accelerator or when speeding up with cruise control. Pressing the gas harder does not help but the vehicle starts working normally a few seconds later. Dangerous on busy roads. I don't think it is a weak fuel pump because it accelerated quickly after an event

The front valve cover is exposed to extreme temperatures from the catalytic converter mounted next to it. There is nothing to protect the rubber components inside from the catalytic converter's excessive heat which is causing them to fail. The steel components inside the cylinder (e.g., the seal ring) are insulated by these rubber components. When these rubber insulators fail, the steel components are exposed and make contact with the aluminum valve cover resulting in the galvanic corrosion of the aluminum. The most common result I have seen is the deformation of the area where the seal ring is seated (along with holes and cracks). Some people have also suggested possible defects in the casting of the aluminum as a contributing factor (the aluminum is also very thin in that area). Some have suggested the possibility of the uninsulated spark plug arcing, but it seems unlikely to generate enough heat to compromise the aluminum's integrity. The way people have described how the aluminum crumbles seems more indicative of corrosion. There are countless testimonies online of similar defects in Odysseys, Pilots, Accords, and Crosstours with the same engine. I have included a photograph of my damaged valve cover and those of others I have found online.

While driving on Thursday, 18 April 2024, the CHECK CHARGE SYSTEM alert and warning light came on in my 2012 Odyssey. I was able to get to a garage that was a few miles away, but the electrical system gave out about 1/4 mile from the garage. I was able to shift into neutral and coast into the parking lot. The dash lights were all off and the electrical system had stopped working. When I tried to exit the vehicle, I could not open the driver door. The lock was frozen in place and wouldn’t budge. I was able to pull the handle, but it did not unlatch or open the door. The power lock buttons did not work either. I tried all the other doors and it was the same situation. I was literally trapped inside my minivan. Someone tried opening it from the outside and that did not work as the doors had auto locked due to driving. The hood release mechanism worked fine, so I was able to pop the hood and a the mechanic jump started my battery and I was then able to unlock and open my car door. This is a serious safety concern as it suggests that an electric system shutdown due to fire, immersion in water, or other emergency situation would render any occupants stuck inside the vehicle. The mechanic evaluated the situation and said my alternator was broken and needed to be replaced. He did that successfully and I was back on the road in about 2 hours. It’s been running fine since then. I think this is a serious issue that Honda needs to address.