C1A16: How to Diagnose & Fix — Manufacturer-Specific Chassis Code (Nissan/Infiniti: Radar/Distance Sensor Obstruction or Misalignment)
4 vehicles · 2 makes · $250-$1,800 repair
How to diagnose and fix C1A16: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Nissan Murano · 2023–2023
The bulletin addresses interrupted ICC, an AEB/FEB warning or a radar-obstruction message only when one specified radar code is the sole stored DTC. The warning does not by itself prove sensor failure. Applies to: 2023 Nissan Murano when one of these radar codes is the only stored trouble code: C1A16, C1A16-97, C2582 or C2582-97. This is a service bulletin, not a recall. Its sensor-date replacement branch does not apply to a 2023 Murano (the bulletin lists Murano only for 2015–2018 in that table).
How to Fix
Have a Nissan technician preserve the fault information and assess obstruction and weather. A 2023 Murano is outside Table A: follow further service-manual diagnosis, not the older-vehicle sensor-date/replacement branch. Do not buy a sensor based on this page.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
Infiniti QX60 · 2022–2025
Owners have reported unexpected forward collision warnings and abrupt braking events with no obvious obstacle ahead, especially in traffic, on curves, or near roadside objects. These complaints are tied to the QX60's ADAS sensor/camera interpretation rather than a conventional brake hardware fault. Sudden braking can create a rear-impact hazard and is one of the more serious owner-reported safety concerns on the current generation.
Common Symptoms
- Forward collision warning with no vehicle ahead
- Unexpected automatic braking
- Dash warning messages for FEB/AEB or front sensor
- System disables itself after warning
How to Fix
Scan the ADAS system for stored faults and verify radar/camera alignment, windshield condition, and front emblem/radar cleanliness. Infiniti service procedures typically involve checking for software updates, recalibrating the forward camera/radar, and replacing a faulty sensor only after alignment and aiming are confirmed. Owners should document the exact conditions when the event occurs to help reproduce the issue.
Owner tips & cautions
- TipAfter windshield replacement or front-end work, insist on proper ADAS calibration rather than assuming the system will self-learn.
Sources for this issue (1)
Nissan Rogue · 2021–2025
Multiple owners of the current-generation Rogue report the forward collision warning / automatic emergency braking system issuing sudden alerts, disabling itself, or in some cases braking unexpectedly with no obstacle present. Complaints commonly mention 'Front radar unavailable due to obstruction' or related warning messages in clear weather, sometimes recurring after restart. This is a safety-related issue because it can cause abrupt deceleration or loss of driver-assistance functions when expected.
Common Symptoms
- Automatic emergency braking activates with no vehicle ahead
- Forward collision warning chime or dash warning appears unexpectedly
- Front radar obstruction or unavailable message
- ProPILOT Assist disables itself
- Cruise control or driver-assist features become unavailable
How to Fix
Scan the ADAS modules for stored faults, inspect radar sensor mounting and alignment, and verify the front emblem/radar cover is clean and undamaged. Nissan service procedures typically involve radar aiming/calibration, checking harness/connectors, and replacing the radar sensor or related components if faults persist. If the vehicle has collision damage, bumper cover fitment and bracket alignment should be checked carefully because small misalignment can trigger repeated faults.
Owner tips & cautions
- TipClean the front emblem/radar area and inspect for bumper misalignment or prior minor impact before replacing parts; many owners report intermittent warnings caused by sensor aiming issues.
Sources for this issue (1)
Nissan Sentra · 2020–2025
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C1A16 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C1A16 mean?
C1A16 stands for "Manufacturer-Specific Chassis Code (Nissan/Infiniti: Radar/Distance Sensor Obstruction or Misalignment)." C1A16 is a manufacturer-specific chassis code commonly seen on Nissan and Infiniti vehicles equipped with intelligent cruise control and forward-collision/automatic emergency braking, where it relates to the front radar/distance sensor being blocked, dirty, misaligned, or otherwise unable to function. The driver-assistance module monitors the radar and sets this code when the sensor's view is obstructed or its signal is unreliable, often disabling those safety features. Because it can disable collision-avoidance functions, it carries elevated importance. The exact definition should be confirmed against the specific vehicle.
What are the most common causes of C1A16?
The most common causes of C1A16 are: Obstructed radar sensor (snow, ice, mud, debris, emblem/badge), Misaligned or knocked sensor bracket (often after a minor impact), Damaged or faulty radar/distance sensor, Wiring or connector problems at the sensor, Aftermarket bumper covers or accessories blocking the sensor, Sensor not recalibrated after bumper/grille work, Driver-assistance control module fault. The specific cause varies by vehicle.
How much does it cost to fix C1A16?
Repair costs for C1A16 range from $250 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by C1A16?
Au7o has documented C1A16 across 4 vehicle models from 2 manufacturers: Infiniti, Nissan.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.