The contact owns a 2016 Honda Odyssey. The contact stated while driving at an undisclosed speed, there was an abnormal knocking sound coming from the engine compartment. In addition, the contact noticed the knocking sound when the vehicle started. The contact stated that the failure was persistent, and the abnormal knocking sound had gotten louder. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 72,000.

- Chariton, IA, USA

The contact owns a 2016 Honda Odyssey. The contact stated while driving at undisclosed speeds, the vehicle experienced a loss of automotive power. The contact was able to coast to the side of the road and noticed several unknown warning lights illuminated. The vehicle was taken to the dealer and an independent mechanic; however, no cause for the failure was found. However, the dealer replaced the oil gasket, and the spark plugs. Ken Garff Honda of Orem (195 E University Pkwy) replaced the timing belt. The contact stated that the failure persisted. The manufacturer was notified of the failure. The failure mileage was approximately 67,000.

- Vineyard, UT, USA

I own a 2016 Honda Odyssey. This past summer, while driving the vehicle began to lose power and shake. I had it towed in where I was told that the piston rings needed to be replaced, however, the first step would be to replace the spark plugs. They knew exactly what was going on because numerous individuals have had the same issue with their Honda Odyssey. Now just last week the same problem happened and the piston rings are being replaced for $5000. There was previously a class action lawsuit on earlier model year Honda Odyssey's due to the same issue. Honda then did nothing to fix the issue with the next model of the Odyssey. It is frustrating that their is a known issue that they are doing nothing about. We literally lost power while driving down a busy highway putting us and others at risk. Luckily we were able to get off of the road safely without causing any issues. You have previously looked into the earlier model Honda odyssey's I would appreciate it if you would with the newer models as well. Thank you.

- Milwaukee, WI, USA

Dear Honda Customer Service, I am writing to formally report a serious issue with my 2016 Honda Odyssey and to request a full repair at no cost due to what appears to be a manufacturer defect. In March 2024, my vehicle began experiencing a mild shudder/vibration noise, and the Check Engine Light turned on. I took the vehicle to Vacaville Honda, where a diagnostic was performed. The technicians informed me that the engine has a faulty VCM (Variable Cylinder Management) system, causing misfiring due to oil leakage on the spark plugs and piston rings. The only solution given was to replace the engine at a cost of $6,000, which is an unreasonable expense for a known issue related to Hondas VCM system. I have maintained my vehicle regularly at Honda dealerships and followed all manufacturer-recommended maintenance schedules. This engine failure is not due to negligence or wear and tear, but rather a design defect that has affected many Honda owners. Given these circumstances, I respectfully request that Honda cover the full cost of the engine repair or replacement under a goodwill warranty. I also ask that you investigate whether this issue qualifies for a recall or extended warranty assistance. Please respond as soon as possible, as my vehicle is currently unsafe to drive. Thank you.

- Suisun City, CA, USA

Vehicle started showing "check engine" light and some other incidental warning lights. Engine started running roughly. We took this to the dealer and they said that engine needed to have piston rings replaced (along with some other unrelated items.)

- Woodstock, GA, USA

Local mechanic informed me that there there is a defect in the piston causing oil to leak in and ruin the piston and spark plugs. This is fouling up the spark plugs, which are covered in oil. Temporarily he said to replace the spark plug. If that does work, he recommended a valve cover replacement. And if that still doesn't work to replace the engine. This was on cylinder number 1. This also happened last year with cylinder number 3. The engine light comes on and the vehicle starts shaking and causing engine misfiring. The oil was changed approximately 1 week ago when cylinder 1 was having issues. Yes, this vehicle is currently available for inspection. This could be a safety issue due to engine failure while driving on a busy road. This van was purchased used in 2018 with 1 previous owner. This problem has been confirmed by a repair shop.

- Aberdeen, NC, USA

The engine failed while driving on the highway. All lights flashed on dashboard and loss of power to the vehicle. There were no prior check engine lights on before it activated and started flashing. Piston 3 failure that had to be replaced (pistons 1-3). Engine had been burning oil but no low oil indication had been illuminated nor was car due for an oil change. Spark plugs and ignition coil had been replaced approx. a year prior due to similar but less severe incident of check engine light coming on and misfiring engine. Six months after the pistons were replaced, the oil pressure switches were diagnosed as faulty and needed replacement due to a false low oil pressure reading.

- Knoxville, TN, USA

Alex from Germaine Honda informed us -??There is a defect in the piston causing oil to leak in and ruin the piston and spark plugs. The only option is to replace the engine. There was a light that came on indicating oil was low a few weeks before it symptoms started however there was plenty of oil when checked and it was not time for oil change per record. While driving one day car started shaking and engine misfire. Multiple engine and system warning lights came on. In 2022, we had a similar issue with piston rings out of alignment and spark plugs fouled with oil that resulted in costly repairs. Yes this vehicle is currently available for inspection. This could be a safety issue due to engine failure while driving on a busy road. This van was purchased used in 2018 with 2+ previous owners. This problem has been confirmed by a honda dealer.

- Springboro, OH, USA

Just before hitting 100k miles and planning for timing belt maintenance, I got hit with the well known VCM V6 engine issue. Fix for 7k from my own pocket? No. I just replaced spark plugs and as the advisor suggested I have to install the VCM Muzzler (from after market, as Honda don't do this) to deactivate ECO mode in order to prevent future damage. I hope NHTSA will force Honda to recognize this is their fault (poor design) and fix this on a big recall, otherwise I'll participate in a lawsuit when that will occur for this lemon car.

- Annandale, VA, USA

Connecting rod failure. This could have been a serious issue as it happened on the highway. I was in the middle lane when it locked up. Luckily I was able to safely get to the shoulder. There was no warning before it happened. ( No engine light, no noises at all). This has been inspected by my local Honda dealer and confirmed.

- Elgin, IL, USA

Brought brand new in 2016, our Honda odyssey has been well maintained by the dealer. Just hit 148k miles, and the check engine light started flashing - took it straight to the dealer. Said that we need the engine rebuilt for $4k replacing spark plugs and cylinders. Upon further research, this is a known issue with the VCM motors by Honda, and had a class action lawsuit for previous years of the odyssey- but when the lawsuit was done, our years had not reached over 100k miles yet. Honda service is saying there is now a software update to prevent this from happening again, when we replace cylinders, but why is this happening when we have brought it to the dealer for all maintenance and if there was a preventative fix for this, why wasn-??t it done before damage was done to the engine? We are being given the run around, was offered $500 to buy our van, or pay the $4k+ to fix. Honda corporate is just going in circles not giving us answers and why this is being allowed to happen. This is my 4th Honda - 2nd to buy brand new- and this is making me question loyalty to the brand.

- Frisco, TX, USA

The contact owns a 2016 Honda Odyssey. The contact stated while driving 65 MPH and depressing the accelerator pedal to pass another vehicle, the vehicle hesitated to respond and the engine sputtered. Additionally, the contact stated while driving from a complete stop the failure recurred. There was no warning light illuminated. The contact stated that the failure had been recurring while driving. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was notified of the failure and referred the contact to the dealer for diagnostic testing. The failure mileage was approximately 76,000.

- Douglas, MA, USA

My engine's check-engine light began flashing, and it turned out to be misfiring on one of the cylinders. The dealer disassembled the cylinder and found that it was filled with oil, and the piston seals had failed for cylinders 1-3, and they are now saying it will be a $4K rebuild of the seals. Looking online, this appears to be a VERY common problem with these V6 Honda engines that have VCM on them; this is the same VCM system for which Honda had to settle a class-action lawsuit for this exact issue happening to thousands of engines. They only included vehicles through the 2013 model year, but continued to use the VCM system in later engines; there are thousands of reports of this same issue continuing to occur.

- Washington, DC, USA

The engine failed and required a complete ring/piston replacement at a cost of $5,670,52 with only 135,946 miles. I purchased the vehicle new and had it serviced at Honda dealerships throughout its life. These vehicles are used by families and many older citizens because of their ease of access and advertised reliability. Such an unexpected expense should be covered by Honda. This ring/piston replacement has been a problem in earlier modules and was covered by Honda.

- Elizabethtown, KY, USA

The contact owns a 2016 Honda Odyssey. The contact stated that while driving at an undisclosed speed, the vehicle stalled. The check engine and ABS warning lights illuminated. In addition, the contact stated that when the fuel tank was not full, the vehicle would not accelerate as intended while depressing the accelerator pedal. The vehicle was taken to a local Auto Zone where it was scanned and diagnosed with a code P0848. The contact stated that the cylinders and spark plugs were previously replaced by an independent mechanic. An appointment with the dealer was scheduled to inspect the vehicle further. The manufacturer was not made aware of the failure. The failure mileage was approximately 133,000.

- Fort Meade, MD, USA

the engine has failure has been twice 5500 repair, because the ECO mode that was known in a former class action. HONDA Motor has done nothing to actually cure the problem and continues to sell faulty engines that can cause engine failure mid drive and causes a safety issue, and has proven over and over again that this failure has not been resolved. We were told by a few places so the engine doesn't go out again this would be a third time and ALL WORK HAS BEEN DONE AT HONDA! TO buy from amazon a item called the VCM muzzler to shut down the software so the engine will work for longer, and there is a secondary market for this, and a few of the 3.5 liter v6 HONDA engines- how is this not been a engine recall, on a 46K vechial with 5500 repairs required 2 times in 50K and we know it will go out a third time, and the van is no longer safe and reliable and yet we purchased the car new all work done at honda, and another 5500 for the repair, and the car still does run as it should doesn't accelerate as it should causing safety issues. I really hope you research and get people that own these cars recalled to be a safe car. thank you

- Plainfield, IL, USA

Timing belt tensioner failing with only 51K miles

- Plano, TX, USA

In January 2024 engine began misfiring, towed to shop, all spark plugs replaced due to fouling by oil. June 2024 issue began again, towed to shop, spark plug 1 found to be fouled by oil. Shop states this issue is likely caused by piston ring malfunction known to be an issue in earlier year Honda Odysseys. Honda states issue was fixed in 2014 and newer models, yet many complaints found online for 2016 model.

- Maple Falls, WA, USA

The engine failed, at 90,238 Piston misfire it was replaced 1-3, This happened a second time at 143,000 miles- while the car was moving and same thing engine failed a second time- had it towed in due to the engine not working it doesn't accelerate on a highway to merge has been dangerous- Brought to Honda a few times, because the engine was not working right you cannot accelerate properly on a on ramp and will not accelerate how it should, this is the same issue that was known by Honda. Called Honda they will not do anything more - it was "fixed" according to honda, but still not running how it should it feels like a bad transmission wont accelerate property when- so the car is not safe to drive in any distance misfire ALL WORK VAN WAS DONE AT HONDA DEALER ONLY

- Plainfield , IL, USA

We are reporting a safety concern on the Honda Odyssey that Honda Corporation is aware of on the 2016 Honda Odyssey. They have a defect in the Piston Rings on the Engine. This engine design on the 2016 engine is the same where a recall was called on older versions of the Odyssey and other Honda vehicles. They have not included the 2016 as they say that they haven't had many cases of this version having the problem. With a quick search of the web you will find many people who are reporting or talking about piston ring issues, misfire and spark plug problems on the 2016 Odyssey. They are then asking customers to spend between $3 and $5 to fix this problem in the engine. Which is a known engineering defect! I have kept up with my oil changes and had a well maintained vehicle rating on CarFax. We are reporting the problem to you as when this happened it was extremely dangerous to drive the van. We were stopped at a red light just stopped and the engine was idling when all of a sudden the van started shaking. No sign of a problem prior to this happening. Then we looked and no lights were on but as soon as we started to drive the check engine light came on. We drove the van the couple of miles home as it was a Sunday and the engine had no pick up and go. Pulling into traffic or turning was a danger. This is a danger to not only us in the van but others around us who are not aware of a problem. We drove the van to the dealership on Monday morning. They said that it had caused a bad spark plug and they could clean the area and we may get 5000 to 20000 more miles but that recommended that we would some point need to spend the $4600 to fix the piston rings as well. We did the spark plug repair and they returned the van to us. It still seemed sluggish but we quickly realized that it was having major problems. This is a danger to people in the vans as well as others on the road. Honda should be required to cover the cost of piston ring issues on all years.

- Farmington Hills, MI, USA