2017-2021 Honda Models ACC Warning Lamp with DTC P2583-76

Owners of 2017-2021 Honda Accord, Accord Hybrid, Civic, CR-V, and Insight vehicles may experience an Adaptive Cruise Control (ACC) system error message and an illuminated ACC warning lamp, especially when driving in low or freezing ambient temperatures. This issue is specifically addressed by Honda Service Bulletin 21-068, which supersedes a previous version of the same bulletin dated August 31, 2021. This updated bulletin provides revised information regarding affected vehicles, software, and repair procedures.

This condition is often accompanied by the diagnostic trouble code (DTC) P2583-76. The bulletin provides a corrective action involving an inspection and, if necessary, a software update for the millimeter wave radar, which is a key component of the Integrated Driver Support System. If you are experiencing a Honda P2583-76 ACC warning, this bulletin outlines the official repair.

Symptoms

The primary symptom owners will notice is the "ACC system error message" appearing while driving, coupled with the "ACC Warning Lamp Is On" in the instrument cluster. This typically occurs when outside temperatures are low or near freezing.

Fault Codes / DTCs

The specific diagnostic trouble code associated with this issue is:

• P2583-76: "Temporary stop of Integrated Driver Support System [Misalignment Millimeter Wave Radar]"

This DTC indicates a temporary interruption or malfunction of the millimeter wave radar, which is crucial for the Adaptive Cruise Control system.

Possible Cause

The most common cause for the Honda P2583-76 ACC warning is snow and ice accumulating on the front of the millimeter wave radar sensor. This obstruction prevents the radar from functioning correctly, leading to the system error message and the storage of DTC P2583-76.

Important Warnings for Owners

Honda emphasizes that this bulletin is intended for use by skilled technicians. "These procedures should not be attempted by 'do-it-yourselfers,' and you should not assume this bulletin applies to your vehicle, or that your vehicle has the condition described." It is crucial to contact an authorized Honda automobile dealer to determine applicability and perform the repair.

Additionally, "Unnecessary or incorrect repairs resulting from a failure to update the diagnostic and reprogramming software are not covered under warranty." This highlights the importance of ensuring that the dealer uses the latest software versions for diagnosis and reprogramming.

Diagnosis and Inspection Procedure

Before any repair, technicians will perform an inspection:

1. Connect i-HDS: The technician will connect the i-HDS diagnostic system to the vehicle and check for the presence of DTC P2583-76.
2. Inspect Millimeter Wave Radar: The millimeter wave radar and its mounting bracket will be visually inspected to confirm they are not deformed or damaged.
3. Customer Interview: The technician will ask the owner questions to confirm if snow or ice might have been stuck to the front of the radar when the symptom occurred, or if the temperature was below freezing.
4. Confirm Cause: If the information confirms that snow/ice sticking to the radar caused the symptom, the repair procedure will proceed. If not, normal troubleshooting for other issues will be followed. For more information regarding persistent ACC warning messages after a service bulletin, technicians are referred to Service News article A21070B, "ACC Warning Message Comes Back On After S/B 21-068."

Repair Procedure Summary

The corrective action involves updating the millimeter wave radar software. This procedure requires specific tools and careful execution:

1. Software Update Preparation:
   • Ensure the 12-volt battery is fully charged.
   • Connect a fully charged jumper battery to the vehicle and keep it connected throughout the entire procedure to maintain steady voltage.
   • "Do not use the GR8 because the vehicle requires a steady electrical current."
   • "Control module failure caused by the improper completion of a software update (early key cycle, low battery voltage, disconnected DLC cable, etc.) is not covered by warranty."
   • "If an error occurs during the update or the i-HDS freezes, do not disconnect the battery or turn the ignition to OFF. Reboot the i-HDS, and start over."
   • "To prevent control unit damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, door locks, etc.) during the update."
   • "Warranty reimbursement for technician labor is not allowed for routine checking/installation of any available software update."
2. Software Update: The millimeter wave radar software is updated using the Honda ECU Reprogramming Application with the Denso DST-I vehicle communication interface. Technicians are referred to service bulletin 22-100, "Updating Control Units/Modules with Honda ECU Reprogramming Application," for more details on the update process.
3. Post-Update Notes:
   • If the "Adaptive Cruise Control System Problem" message reappears after the update due to snow/ice, the radar surface should be cleaned, and the vehicle road-tested, or a millimeter wave radar aiming procedure performed.
   • The DTC P2583-76 cannot be cleared by the i-HDS until the radar is re-calibrated by driving the vehicle.
   • If the "Adaptive Cruise Control System Problem" message clears by simply driving the vehicle, then the aiming procedure is not necessary.

Required Tools and Software Versions

To perform the diagnosis and software update, technicians must ensure their diagnostic tools are running the following minimum software versions:

• i-HDS Software Version: 1.006.35
• HDS Software Version: 3.104.040
• Honda ECU Reprogramming Application PC Application Version: 1.2.1.1
• Database Update: 05-AUG-2021
• NoticeDB Version: 05-AUG-2021

The software update will install a specific Program ID (or later) onto the millimeter wave radar, depending on the vehicle model and year. Examples include:

• 2018-20 Accord (ALL): 36802-TVA-A180
• 2018-20 Accord Hybrid: 36802-TWA-A210
• 2017-19 Civic (CVT 5-Door): 36802-TGG-A070
• 2019 Civic (6MT 5-Door): 36802-TGG-G060
• 2019-21 Civic (2-Door, 4-Door): 36802-TBA-A160
• 2017-19 CR-V (ALL): 36802-TLA-A070
• 2019-20 Insight (ALL): 36802-TXM-A080
• 2021 Insight (See VIN range): 36802-TXM-A080

The failed part number associated with this repair is 36803-TLA-A03.

Warranty Claim Information

The normal warranty applies to this repair. Dealers should use the following information for warranty claims:

• Operation Number 7805J1: Diagnose and inspect millimeter wave radar, includes DTC clear. Flat Rate Time: 0.3 hours.
• Operation Number 7385A2: Update the millimeter wave radar software. Flat Rate Time: 0.2 hours.
• Defect Code: 03214
• Symptom Code: 03217
• Template ID: A21068A
• Failed Part Number: 36803-TLA-A03

Owner Action

If your Honda vehicle, specifically a 2017-2021 Accord, Accord Hybrid, Civic, CR-V, or Insight, is displaying an "ACC system error message" or an "ACC Warning Lamp Is On" in cold weather, or if you suspect a Honda P2583-76 ACC warning, it is recommended to contact an authorized Honda dealer. They can diagnose the issue, confirm if Service Bulletin 21-068 applies to your vehicle, and perform the necessary software update for the millimeter wave radar.

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Source: NHTSA ID 10247656, Service Bulletin 21-068.