2020 HONDA ODYSSEY Complaints

Upon starting the vehicle, the following all fail: Adaptive Cruise Control Forward Collision Warning Lane Departure Warning Lane Keeping Assistance

We bought this van with a clean bill of health as far as accidents and single owner prior to us. The car had a documented maintenance history but after 5K miles of driving it the active cruise control began to through all kinds of errors. I researched this issue and find that many more Honda owners with active cruise control have the same issue. A few customers say that they had their front camera replaced and calibrated for a cost of about $1,600.00 only to have the error show up again. I am writing this message to report that in my case I have found a work around. It’s not a permanent fix but points to Honda’s computer throwing a false positive error that is costing a great deal of money to Honda owners. On our van when this error happens, I force a diagnostic scan followed by a forced computer reboot and the warning lights are fixed an all equipment back to working. It’s horrible to read that Honda charges $1,600.00 to replace perfectly good parts in all their line without taking the time to truly diagnose their issues with ACC errors and do good to their customers. I hope this helps reach someone who can further investigate this issue with Hondas. In our family’s case we are lucky that I have an IT background and was able to find a fix for this issue without any costs to our family financials and avoided paying Honda to replace perfectly working components due to their lack of knowledge of how their equipment works. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The windshield camera malfunction caused a loss of all adaptive features include: lane keep assist, adaptive cruise control, regular cruise control, collision prevention, automatic emergency braking system, and automatic highbeam.

It happened twice this month already. Once while driving, the car lost power (as if engine was never turned on), and the gear changed to N so I tried to slow down, then the power came back on, and then I was able to shift to D and continue my trip. Second one happened this morning. It was on auto-shutting idle position and when I put my foot on the accelerator, it completely lost power again (I recently changed the battery and tested in the afternoon and all working properly).

After driving for about a minute, there is a beep and the brake system warning light comes on. Then the dash begins cycling through multiple warning messages - LKAS/ACC/CMBS/RDM - and will not stop. Now the repair shop tells us that the front multipurpose camera ADAS needs to be removed and replaced, and the ADAS calibrated. Including the fee to diagnose the issue, total cost is $2,980. Van has about 56,500 miles. We have already had it towed twice for battery replacement following similar symptoms, and had battery replaced both times. But with the new battery only 3 months old, it became clear the issue was bigger.

Infotainment system - while driving suddenly there is a cracking/ shrieking startling noise and infotainment system goes off shutting down ( network communication lost sign comes on) and the screen goes blank. No camera works. Radio and all electronic display goes off for a couple of minutes. Slowly, it begins to come back to life by itself in a couple of minutes. This happens randomly on and off. In last 4 weeks, it happened at least 15 times while driving. Honda dealership has my car for three days without a diagnosis or correction.

Vehicle was acting normally, and unexpectedly 5 warning alarms came in concurrently all related to ADAS features, creating confusion for the driver. No other abnormalities were observed. Vehicle runs and drives normally. All the ADAS features are disabled and the warning lights continue to display every time the vehicle is driven. There is no way to disable the lights and the culprit of the alarms is a bad multipurpose camera behind the windshield. Honda wants around$1500 (parts and labor) to replace the camera. A quick search finds this a common complaint amongst Odyssey owners and a recall should be issued.

__ The present complaint alleges as follows: 1. Honda has a defective design in the Advanced Driver Assistance Systems (ADAS) of all Honda Odysseys, models 2018-2023. 2. Namely, Honda has placed the RADAR behind the large HONDA emblem on the front grille. This causes the radar to give a "RADAR OBSTRUCTED" warning, which disables all Advanced Driver Assistance Systems in the car (Automatic Emergency Braking, Adaptive Cruise Control, Forward Collision Warning). 3. The "RADAR OBSTRUCTED" warning cannot be reset by restarting the vehicle or disconnecting the battery, requiring recalibration of the RADAR at the cost of $800 each time since it takes several hours to do (per Dealership). 4. The official Honda Odyssey Forum online has countless complaints on the same issue without resolution by Honda. 5. Honda has acted in bad-faith towards their customers since this defect impacts the vehicle's advanced safety features for which buyers incur additional expenses, endangering the lives of passengers. 6. Honda has acted in bad-faith towards their customers by designing a system that requires continuous and substantial expenditures without resolution because it is an engineering problem, i.e., the placement of the radar behind the large, thick plastic H emblem obstructs the radar. 7. I hereby ask that the NHTSA investigate this issue and order Honda to offer a solution in the form of a RECALL that permanently addresses the problem.

Several engine failures, starting one month after purchase in September 2020. multiple system failures (all on video) leading to very poor acceleration and operation. No compression in engine and only able to go 20 mph. White-Allen Honda made four attempts to solve the matter over the course of two years. The dealer has had the car a total of 120 days. Then end of December 2024 then engine began making a knocking sound and I was told it needed at new engine, to the tune of $10,000.00. Then I see a recall for a similar issue but only up to 2019 Odysseys. Please help find resolution for this.

While driving on 12/20/2024 the 2020 Honda Odyssey started showing 5 warning lights (ACC, LKAS, Collision Mitigation System Problem, Road Departure Mitigation System Problem, & Auto High-Beam Problem) on the dashboard, along with the “BRAKE SYSTEM” light. After these messages and light popped up, the cruise control would not work. The crash mitigation system would not work (automatic breaking). The lane assist would not work as well. All of these safety features would not work which posed a combined severe safety issue to my family while driving the van, and those around me on the highway. After parking the van, I Googled these messages and saw that not only was this an issue with my model of Odyssey, but with several of Honda’s vehicles which use the same Monocular Camera. After getting my battery checked to ensure there was no low voltage issue (to which there was non and the battery checked out okay), I took the van to a Honda dealership. The Honda dealership performed a “Express Service Multi-Point Inspection” diagnostic test and told me on 12/23/2024 that the Monocular Camera was defective, which controls all of the safety systems listed above. On 01/02/2025, the Honda dealership replaced the defective Monocular Camera, to which they charged me full price for the Monocular Camera part itself and the labor to put the Monocular Camera in the Odyssey. Once the repair occurred, ALL of the messages and lights on the dashboard have cleared and all of the safety systems mentioned above are now working correctly.