2012 Honda Odyssey

The Office of Defects Investigation (ODI) received a Petition dated May 30, 2026. The Petition is requesting an investigation into inadvertent air bag deployment in model year (MY) 2011-2017 Honda Odyssey vehicles. The Petition contends that air bags can deploy absent a sufficiently severe event to trigger a deployment, such as an impact, rollover event, or G-force threshold breach. The Petition further alleges that the Diagnostic Trouble Codes (DTCs) and Supplemental Restraint System (SRS) conflict and inaccurate data is being recorded for the air bag system. The Petitioner cites 10 complaints received by ODI alleging the same failure. ODI will evaluate these complaints to determine if they are related to the failure cited in the Petition andconduct a technical review under 49 CFR Part 552. This Defect Petition is being opened to evaluate whether to grant or deny the Petition. The Petition can be viewed at NHTSA.gov under NHTSA Number 11744118.

I own a Honda Odyssey equipped with the Auto Idle Stop (automatic engine start-stop) system. The feature has not operated properly and behaves inconsistently. In addition to frequently failing to engage when the vehicle is stopped, I have experienced several instances where the engine shut off as part of the Auto Idle Stop function and then failed to restart promptly when I attempted to proceed. On several occasions, while stopped at red lights on major roads and highways, the vehicle stalled and took a considerable amount of time to restart. During these incidents, I was unable to move the vehicle when traffic began moving, leaving me stranded in active traffic lanes and creating a significant safety hazard. The delayed restart exposed me and my passengers to the risk of rear-end collisions and other accidents. This issue has occurred multiple times and has caused me to lose confidence in the reliability and safety of the Auto Idle Stop system. A vehicle should not become temporarily disabled in traffic due to the failure of a system intended to improve fuel efficiency. Given the repeated nature of the problem and the potential for serious injury, I believe this issue warrants investigation. On August 7, 2026, I brought my Honda Odyssey to an authorized Honda dealership to diagnose the Auto Idle Stop system due to repeated incidents in which the vehicle failed to restart promptly after the engine shut off at a stop. According to the dealership's service report, the technician stated that they had identified similar complaints from other Honda Odyssey owners and that Honda is currently investigating the concern. The technician monitored live vehicle data and determined that the battery voltage did not drop excessively, the starter was not drawing excessive voltage, and no diagnostic snapshots or fault data were stored by the vehicle at the time of inspection. As a result, the dealership was unable to perform any repairs.

NHTSA ID

11756147

Incident

Apr 9, 2026

piston rings wore out prematurely on our 2012 honda odyssey. this was caused by the vcm system. its a known issue on hondas. it only had 88,600 miles at the time. we were driving our 2012 honda odyssey in december 2023. the check engine light began to flash. it starting running rough. we had it towed to a honda dealer for inspection. they pulled codes p303 and p304. they said the rings were worn and spark plugs fouled. they said this is a common issue because of the vcm. they peformed a rering job and with all parts and labor the cost came to $4000. we are very disgusted that this issue was already known by honda and they failed to place the vehicle on recall or wave the repair cost. they had a previous recall for this issue, but they say it was for a limited time frame. my mother only drives less than 10k miles a year, so the issue wouldnt have happened before 2016, as the miles on her van were still very low. we are issueing a complaint against honda for this issue. we are asking for reimbursement for the repair for the piston ring job which was $4000 while we had the vehicle in for this repair, we were also informed of other issues with the van, and we went ahead with those repairs as well, which brought our repair bill total to over $6419, which is also shown on the same receipt.

NHTSA ID

11738298

Incident

Dec 11, 2023

Odometer Fraud. The contact purchased a 2012 Honda Odyssey. It was discovered that there was a mileage discrepancy. The vehicle was a private sale. The vehicle mileage was 117,000 at the time of purchase; however, the title listed the mileage at 14,580. The Department of Motor Vehicle reported that the actual mileage as 214,000.

NHTSA ID

11735117

Incident

Apr 29, 2026

Mileage

214,000 mi

The 2012 Honda odyssey alternator caught on fire after the battery light came on which luckily I, the driver, was able to put out. The next day I towed the vehicle to Boyd Honda Auto in Oxford, NC, where they confirmed with diagnostic that the alternator was overworking and that there was a seeping spool valve. This seeping spool valve is a manufacturer’s defect.

NHTSA ID

11735013

Incident

Apr 22, 2026

On Wednesday night, the battery light initially came on and after a few minutes the van had this burning smell so I pulled over and the alternator was on fire. I put it out with several bottles of water from papa John’s. Today, at Boyd Honda in Oxford said in the diagnosis that there was a sweeping spool valve that had leaked which must have caused the alternator to blaze because this is a manufacturer’s defect from Honda.

NHTSA ID

11733644

Incident

Apr 22, 2026

Odometer Fraud. The contact purchased a 2012 Honda Odyssey. The contact discovered that there was a mileage discrepancy after the purchase. The vehicle was a private sale. At the time of purchase, the vehicle mileage was 80,000. It was later discovered, after checking the Carfax report that the mileage was 285,000.

NHTSA ID

11703691

Incident

Dec 8, 2025

Mileage

285,000 mi

Vcm problems burn oil and misfire code

NHTSA ID

11687498

Incident

Sep 1, 2025

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.

NHTSA ID

11684172

Incident

Aug 2, 2025

Dealer message - On January 23, 2016, American Honda announced a product update for 2011-14 Odyssey vehicles. The trailer hitch weight was not properly calculated into the gross axle weight rating (GAWR) on the vehicle certification label. This can create a situation where the vehicle exceeds the indicated gross axle weight rating.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2011-2016 CR-Zs, 2010-2014 Insights, & 2011-2017 Odysseys with a customer complaint of the brake pedal feeling soft or spongy when depressed, almost reaching the floor. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to any repair attempts.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2011-2016 CR-Zs, 2010-2014 Insights, & 2011-2017 Odysseys with a customer complaint of the brake pedal feeling soft or spongy when depressed, almost reaching the floor. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to any repair attempts.

"Service Bulletin - There are several A/C leak detection tools available. -Refrigerant Gas Leak Detector -Ultrasonic Leak Detector -Leak Dye"

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2011-2016 CR-Zs, 2010-2014 Insights, & 2011-2017 Odysseys with a customer complaint of the brake pedal feeling soft or spongy when depressed, almost reaching the floor. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to any repair attempts.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2011-2016 CR-Zs, 2010-2014 Insights, & 2011-2017 Odysseys with a customer complaint of the brake pedal feeling soft or spongy when depressed, almost reaching the floor. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to any repair attempts.