Date: 2025-03-26
Honda
(American Honda Motor Co.)
NHTSA Action Number: EA25004
Components: ENGINE AND ENGINE COOLING:ENGINE:HARD PARTS INTERNAL/MECHANICAL
Subject: No Restart After Auto Start/Stop Engages
Opened From: 2025-03-26 - ⚠️ Investigation Open
Summary
On June 3, 2022, the On??ce of Defects Investigation (ODI) opened Preliminary Evaluation PE22005 after the agency received VOQs and several n??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 tran??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 ("PGM-FI") 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 Honda's service campaign efficacy. ODI is additionally expanding the scope to encompass all vehicles addressed in Honda's 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.
For documents related to this investigation, visit the NHTSA Website.
Click the (+) and then Associated Document(s).
More Information on this Investigation on the NHTSA WebsiteSearch NHTSA Database for Recalls
Search NHTSA Database for (TSB's) Technical Service Bulletins
Technical Service Bulletins TSB's List
Search NHTSA Database for Vehicle Complaints
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