2024 Honda Civic MIL Software Update Emissions Recall

American Honda has announced a stop sale and emissions recall for certain 2024 Civic vehicles. This action addresses concerns with the proper operation of the Malfunction Indicator Lamp (MIL) due to incorrect software. This important update is detailed in Service Bulletin 24-063.

Why This Matters

The Malfunction Indicator Lamp (MIL) is a crucial component of a vehicle's emissions system. Its proper operation is mandated by regulatory requirements, as it alerts drivers to potential issues that could affect emissions or engine performance. When the MIL system is not functioning correctly, it can lead to a vehicle failing emissions inspections and potentially masking underlying engine problems. This recall ensures that all affected 2024 Honda Civic models comply with these critical safety and environmental standards.

What's Being Recalled

This recall specifically targets certain 2024 Honda Civic vehicles. The core of the issue lies with the software installed in the PGM-FI (Programmed Fuel Injection) system and the Serial Data Gateway Module, also known as the CAN gateway. These modules contain incorrect software that affects the ECU's internal voltage sensor monitor, preventing the MIL from operating as required. No physical parts are being replaced; the remedy is purely a software update.

Symptoms

The primary symptom of this issue is the improper operation of the Malfunction Indicator Lamp (MIL). This means the MIL might not illuminate when it should, failing to alert the driver to a potential emissions or engine control system fault. Owners may not directly observe a fault unless an actual engine problem occurs and the MIL fails to activate. The underlying cause is that the ECU internal voltage sensor monitor does not operate according to regulatory requirements due to the incorrect software. This Honda Civic MIL software update is crucial to restore proper functionality.

Diagnosis and Trigger Conditions

Honda dealerships can determine if a specific 2024 Honda Civic is affected by performing an iN VIN status inquiry. This inquiry will identify units in inventory or customer vehicles that require the software update. The condition that triggers this recall is the presence of the incorrect software version in the PGM-FI and Serial Data Gateway Module (CAN gateway) systems. There are no specific driving conditions or owner actions that trigger the fault; it is a pre-existing software anomaly.

Repair Procedure Summary

The repair for this emissions recall is straightforward and involves a software update. Technicians will update the software for both the PGM-FI system and the Serial Data Gateway Module (CAN gateway). This process does not require any special tools or replacement parts. The software itself is readily available to dealerships. This 2024 Honda Civic MIL software update will ensure the Malfunction Indicator Lamp operates correctly and complies with all regulatory standards.

Important Warnings

American Honda has issued a "stop sale" for affected 2024 Civic vehicles. This means that these vehicles cannot be sold until the necessary software update has been completed. Dealerships are explicitly warned that "Failure to repair a vehicle as necessary prior to sale may subject your dealership to claims or lawsuits." This underscores the importance of addressing the incorrect software before any affected vehicle is delivered to a customer.

Owner Action

If you own a 2024 Honda Civic, American Honda expects to begin customer notification in early July 2024. Once you receive notification, you should contact your authorized Honda dealership to schedule an appointment for the software update. This repair will be performed free of charge. It is important to have this Honda Civic MIL software update completed to ensure your vehicle's emissions system functions correctly and complies with all regulations.

Source: NHTSA ID 11000276