2024 Honda Ridgeline

On June 3, 2022, the Office of Defects Investigation (ODI) opened Preliminary Evaluation PE22005 after the agency received VOQs and several field 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 traffic 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.

My auto stop engine device would not restart at an intersection and it left me stranded . The truck would not move, and I tried repeatedly to get the truck moving. This has happened several times this year since December 2025. Bravo Honda, Victoria, Texas told me they were not sure what caused the problem, but they said they charged the battery and felt as if this would resolve the issue. The next time I had an issue Bravo Honda replaced the battery and I was told that was the issue. Now this time Bravo Honda, Victoria , Texas has escalated the issue to Honda tech. They have had my truck 2 days and no resolution as yet, although they believe the starter is faulty and needs replacing. This is very dangerous as I have been left stranded in heavy traffic. I feel the mechanic maybe guessing at what is wrong with the truck. The last incident happened on 09/17/2026.

NHTSA ID

11766418

Incident

Sep 17, 2026

2024 Honda Ridgeline, VIN [XXX], approximately 21,000 miles. The vehicle has repeatedly failed to restart in traffic after the Auto Idle Stop system automatically shut off the engine. Failures occurred XXX. During one occurrence, I was nearly rear-ended when the vehicle failed to restart as traffic began moving. The vehicle also intermittently cranks abnormally slowly when hot. The starter will crank, pause, then crank noticeably slower. I can intermittently reproduce the fail to start problem by driving until the vehicle is hot, shutting it off, and immediately restarting it. I have two videos of this condition. Honda replaced the battery, but the problem continues. The dealer reports that the battery, alternator, and starter pass diagnostic testing. I provided video documenting the abnormal slow cranking and failure to start, but no repair has been made. My primary safety concern is that Auto Idle Stop automatically shuts off the engine while stopped in active traffic, but the vehicle may then fail to restart, leaving it disabled in a traffic lane. The vehicle has already experienced this failure three times. NHTSA is currently investigating Auto Start/Stop no-restart complaints involving 2020–2025 Honda Ridgelines under EA25-004. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11764098

Incident

Jul 16, 2026

I am reporting a recurring Auto Idle Stop no-restart and starting-system failure in a 2024 Honda Ridgeline. At approximately 35,072 miles, while stopped at a traffic light with Auto Idle Stop engaged, the engine shut off but failed to restart when the brake pedal was released. The vehicle remained disabled in the intersection until it was manually restarted, creating a risk of a collision. An authorized Honda dealer found both positive and negative battery terminals loose, tightened them, reported that the battery passed a load test, found no diagnostic trouble codes, and returned the vehicle. The battery had already been replaced at approximately 30,238 miles after a slow-start complaint and a failed battery test. The condition recurred at approximately 42,563 miles. After the engine shut off at a light, the vehicle displayed an orange “P” and “System Problem Detected - Shift to Park,” went into Neutral, and required a manual restart before Drive could be restored. The dealer later reported that the replacement battery tested at approximately 197 CCA against its 650 CCA rating, but no root cause for the rapid deterioration or the shutdown/no-restart condition has been identified. The vehicle now intermittently cranks slowly and appears strained while starting. No permanent repair has been completed. The vehicle is available for inspection. The condition creates a safety risk because the vehicle can fail to restart or move from an intersection and may enter Neutral unexpectedly.

NHTSA ID

11762606

Incident

May 26, 2026

While stopped at a red light, the auto on/off feature engaged and the engine shut off. Upon release of the brake, the engine failed to restart.

NHTSA ID

11762495

Incident

Sep 4, 2026

VEHICLE SHUTS DOWN WHILE IN IDLE AT STOP LIGHT

NHTSA ID

11762483

Incident

Sep 6, 2026

When stopped at a stop light the auto start feature sometimes - more often than not- fails to start back and the truck is stuck at the intersection. After putting it in park it will start after several tries. My dealership tells me there is nothing wrong with it even though it’s still under warranty. This has happened over 10 times to me

NHTSA ID

11761891

Incident

Sep 1, 2026

Receiving pop up faults on instrument panel. ie battery low voltage, adaptive cruise sys problem, road departure mitigation sys problem, Sys problem detected shift to park, to start engine brake and push start, idle stop engine will not restart all of these issue donot throw codes to the main ECM or BCM so dealer can't trace the problem. This has been going on since march 2025

NHTSA ID

11761732

Incident

Mar 15, 2025

My vehicle is currently sitting at a Honda dealership with a broken crankshaft counterweight and seized bearing. The engine needs to be replaced but Honda has refused to conduct the dealership warranty and blame shift it to a cracked oil pan that had happened in November of last year that was quickly addressed. Since then I have gone to [XXX] and back to [XXX] showing the vehicle was fine and operating. It is to my understanding that my 2024 Ridgeline has a 3.5L J-Series V6 engine. The NHTSA is actively investigating over 1.4 million Honda V6 engines for this exact connecting rod bearing seizure defect. I feel it is wrong for the dealership to pin a known defect on something unrelated and have insurance pay and avoid conducting the warranty repair. My vehicle is sitting at 39,000 miles and I was on a normal commute to work when the incident occurred and still covered under factory warranty. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11761193

Incident

Jul 23, 2026

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2024-2026 Odysseys & Ridgelines and 2024-2025 Passports with a customer complaint of the Malfunction Indicator Light (MIL) on with the DTC P0441 (EVAP System Purge Flow Malfunction) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2024-2026 Odysseys & Ridgelines and 2024-2025 Passports with a customer complaint of the Malfunction Indicator Light (MIL) on with the DTC P0441 (EVAP System Purge Flow Malfunction) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2024-2026 Odysseys & Ridgelines and 2024-2025 Passports with a customer complaint of the Malfunction Indicator Light (MIL) on with the DTC P0441 (EVAP System Purge Flow Malfunction) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.

Over The Air - This update contains various performance enhancements and UI improvements.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2023-2025 Odysseys, Passports, and Ridgelines with a customer complaint of the brake pedal sticking or slow to return. This may result in delayed acceleration, dragging noise, or all 3 brake lights staying on without any pedal engagement. The vehicle may also experience issues with activating cruise control. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2023-2025 Odysseys, Passports, and Ridgelines with a customer complaint of the brake pedal sticking or slow to return. This may result in delayed acceleration, dragging noise, or all 3 brake lights staying on without any pedal engagement. The vehicle may also experience issues with activating cruise control. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.