2021-2024 Nissan Models: C1A17-49 / C2580-49 Laser/Radar DTC

Nissan has issued Technical Service Bulletin (TSB) NTB21-106B to address specific diagnostic trouble codes (DTCs) that may appear in the Laser/Radar system of various 2021-2024 Nissan models. This bulletin provides crucial guidance for technicians on how to properly handle DTC C1A17-49 and C2580-49, ensuring that unnecessary repairs are avoided.

The Laser/Radar system is a critical component for many advanced driver-assistance features, including adaptive cruise control and forward collision warning. Proper functioning of this system is essential for vehicle safety and performance. This TSB helps clarify the appropriate diagnostic and repair steps for these specific codes.

Symptoms

Owners may not notice any immediate symptoms if these codes are stored in the 'PAST' column of the vehicle's diagnostic system. However, if the codes become 'CURRENT', it could indicate an active issue with the Laser/Radar system. Technicians may find the following fault labels associated with these DTCs:

• "CONTROL UNIT"
• "ICC SENSOR"
• "ICC SENSOR MALF"

Fault Codes / DTCs

This bulletin specifically addresses the following Diagnostic Trouble Codes:

Code	Description	Module
C1A17-49	Stored in LASER/RADAR for "CONTROL UNIT" / "ICC SENSOR" / "ICC SENSOR MALF"	LASER/RADAR
C2580-49	Stored in LASER/RADAR for "CONTROL UNIT"	LASER/RADAR

Diagnosis and Trigger Conditions

The key to diagnosing these codes lies in whether they are stored in the "PAST" or "CURRENT" column of the diagnostic system. This distinction determines the required action.

• If DTC C1A17-49 or C2580-49 is stored in LASER/RADAR in the "PAST" column: This indicates a historical event that is no longer actively present. The system likely encountered a temporary condition that has since resolved itself.
• If DTC C1A17-49 or C2580-49 is stored in LASER/RADAR in the "CURRENT" column: This signifies an active fault that is currently affecting the system. Further investigation is required.

Repair Procedure Summary

The repair procedure outlined in TSB NTB21-106B is straightforward and depends entirely on the status of the DTCs:

1. For DTCs C1A17-49 or C2580-49 stored in the "PAST" column: The technician should simply erase the Diagnostic Trouble Code from the system. No further action or part replacement is necessary in this scenario.
2. For DTCs C1A17-49 or C2580-49 stored in the "CURRENT" column: The technician must refer to the applicable Electronic Service Manual (ESM) for detailed diagnostic and repair instructions. This indicates a persistent issue that requires a more in-depth troubleshooting process.

Important Warnings

Nissan explicitly states a critical directive for these specific DTCs:

• DO NOT replace any parts if DTC C1A17-49 or C2580-49 is stored in LASER/RADAR in the "PAST" column. Replacing components when only a historical code is present will not resolve the issue and will result in unnecessary costs and labor.

This warning is crucial for owners to understand, as it prevents potentially expensive and unneeded repairs if the fault is not currently active. If your Nissan Sentra C1A17-49 code is in the past, a simple erase is the fix.

Owner Action

If you experience any warning lights or messages related to your vehicle's Laser/Radar system, or if you suspect an issue, it is recommended to visit your authorized Nissan dealer. They have the necessary diagnostic tools and training to properly determine if DTC C1A17-49 or C2580-49 is present and whether it is a "PAST" or "CURRENT" fault. Do not attempt to diagnose or repair these systems yourself, as they are complex and integral to your vehicle's safety features.

Amendment History

This bulletin has undergone several revisions to ensure accuracy and updated information:

• November 15, 2021 (NTB21-106): Original bulletin published.
• March 9, 2023 (NTB21-106A): Applied vehicles revised, and DTC descriptions were added.
• May 10, 2024 (NTB21-106B): Applied vehicles were revised again to include the latest model years.

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NHTSA ID: 11004969