DP26001
All wheel drive allegation
The Office of Defects Investigation (ODI) received a Petition dated January 9, 2026, requesting an investigation into the loss of the optional all-wheel drive capability in model year (MY) 2021-2023 Acura TLX and MY 2022-2023 Acura MDX vehicles. The Petition contends that the interfacing splines between the transmission and the rear wheel drive power take off unit are failing. Failure of these splines prevents the transfer of drive power to the rear axle, making the vehicle front wheel drive only. The Petition further alleges that this failure results in a reduction of vehicle directional control. The Petitioner cites 48 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 and will conduct 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 11712885. The VOQ numbers referenced in the Petition are listed below. 11615217, 11619288, 11633510, 11634618, 11634979, 11636677, 11637484, 11638577, 11638902, 11640757, 11642028, 11642839, 11644661, 11652130, 11652239, 11654456, 11664265, 11662805, 11662895, 11664344, 11664848, 11665162, 11665179, 11665477, 11666444, 11667007, 11667060, 11681206, 11689393, 11693166, 11693788, 11696489, 11696739, 11702530, 11557993, 11551829, 11635395, 11644548, 11647519, 11647996, 11661340, 11671314, 11682637, 11691842, 11693280, 11700591, 11700964, 11702881,
EA25004
No Restart After Auto Start/Stop Engages
On June 3, 2022, the Oï¬ce of Defects Investigation (ODI) opened Preliminary Evaluation PE22005 after the agency received VOQs and several ï¬eld reports concerning the Auto Idle Stop (AIS) feature on 2016-2019MY Honda Pilot vehicles. The complaints allege that the engine fails to restart on its own from a complete stop at a traï¬c light or road intersection with the AIS function engaged. The subject vehicles are equipped with a 3.5L engine with a 9-speed automatic transmission. On January 6, 2023, Honda released service bulletins 23-008 and 23-009. These service bulletins address the failure to restart issue in the 2016-2019MY Honda Pilot vehicles, as well as the 2015-2020 Acura TLX, 2016-2020 Acura MDX, 2019-2022 Honda Passport, and 2020-2023 Honda Ridgeline vehicles. The repair outlined in the service bulletins is a two-stage countermeasure to remedy the issue. The first stage is a Programmed Fuel Injection (âPGM-FIâ) software update. The second stage is only deployed if the software update fails to remedy the issue. The second stage, depending on the model and model year, consists of replacement of the starter assembly, starter relays, and a valve adjustment. Additionally, Honda extended the warranty coverage to 10 years with unlimited mileage for vehicles requiring the second stage component replacement. ODI continues to receive complaints of the AIS failure to restart, with many complainants alleging the campaign countermeasures had been completed.NHTSA has reviewed Honda's Information Request Letter responses involving warranty claims, lawsuits, and consumer complaints in addition to ODI's own data. This Engineering Analysis is being opened to further consider the potential safety defect, including gathering additional data regarding Hondaâs service campaign efficacy. ODI is additionally expanding the scope to encompass all vehicles addressed in Hondaâs service bulletins 23-008 and 23-009 as well as newer model year vehicles, which are substantially similar to the vehicles covered by the service campaign. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.