C1A16 on Infiniti: How to Diagnose & Fix
Manufacturer-Specific Chassis Code (Nissan/Infiniti: Radar/Distance Sensor Obstruction or Misalignment)
1 Infiniti model · 1 documented issue · 1 critical
C1A16 on Infiniti by model: symptoms, diagnosis and fix
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)
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 on a Infiniti?
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. On Infiniti it is documented across 1 model: QX60.
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 on a Infiniti?
Repair costs vary widely with the root cause and Infiniti model; each issue on this page carries its own estimate where one is published.
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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.