C1A12 on Infiniti: How to Diagnose & Fix
Manufacturer-Specific Chassis Code (Nissan/Infiniti: Radar/Laser Sensor Beam Off-Center)
1 Infiniti model · 1 documented issue · 1 critical
C1A12 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)
C1A12 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 C1A12 mean on a Infiniti?
C1A12 stands for "Manufacturer-Specific Chassis Code (Nissan/Infiniti: Radar/Laser Sensor Beam Off-Center)." This is a manufacturer-specific chassis code seen primarily on Nissan/Infiniti vehicles, generally associated with the forward radar/laser sensor used by adaptive cruise control and collision-avoidance systems being misaligned or 'off-center.' Because it is not a generic SAE code, the exact meaning can vary by maker and model, but it broadly points to an issue with the driver-assistance/distance sensor or its aim. When set, related systems like intelligent cruise control or forward emergency braking may be disabled. A vehicle-specific service procedure (sensor aiming/calibration) is typically required. On Infiniti it is documented across 1 model: QX60.
What are the most common causes of C1A12?
The most common causes of C1A12 are: Misaligned or blocked forward radar/laser sensor, Sensor knocked out of aim by minor impact or bumper work, Obstruction or dirt over the sensor (snow, ice, debris), Faulty distance/radar sensor, Wiring or connector fault at the sensor, Sensor calibration not performed after service/alignment. The specific cause varies by vehicle.
How much does it cost to fix C1A12 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.
Looking for C1A12 on a different make?
View C1A12 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.