C1A14: How to Diagnose & Fix — Front Radar Sensor Beam Axis Not Adjusted
2 vehicles · 2 makes · $250-$1,800 repair
How to diagnose and fix C1A14: 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.
Lexus RX · 2023–2025
Owners of the current-generation RX have reported recurring messages such as 'Pre-Collision System Malfunction,' 'Front Camera Unavailable,' or temporary loss of adaptive cruise and lane functions. These complaints appear in NHTSA filings and owner forums, often after windshield replacement, minor impacts, heavy rain, or sometimes with no obvious trigger. The issue is commonly related to camera/radar obstruction, calibration drift, connector faults, or software sensitivity in the Lexus Safety System+ suite.
Common Symptoms
- Pre-Collision System Malfunction message
- adaptive cruise control unavailable
- lane tracing assist unavailable
- front camera unavailable warning
- intermittent driver-assistance shutdown
How to Fix
Inspect the windshield camera area and front radar emblem area for dirt, condensation, damage, or non-OEM replacement parts. Perform a scan for ADAS-related DTCs, then complete static/dynamic calibration of the forward recognition camera and millimeter-wave radar if alignment is out of spec. If warnings persist, dealers may apply software updates or replace a faulty sensor/module after confirming power, ground, and network integrity.
Nissan Sentra · 2015–2021
Sentras equipped with Nissan's Forward Emergency Braking / Automatic Emergency Braking apply the brakes hard for non-existent obstacles ('phantom braking'). The Bosch radar module behind the front grille (sensor assembly p/n 28438-5UD0A) produces false positives, frequently triggered by overpasses, bridges, railroad tracks, parking-garage walls, and metal grates. Nissan disclosed 1,233 related consumer complaints to NHTSA for the Rogue/Rogue Sport/Sentra, including dozens of minor collisions and injury allegations, and the defect is the subject of class-action litigation.
Common Symptoms
- Sudden hard braking with no obstacle present
- Forward Emergency Braking warning chime and dashboard alert
- Brake activation near bridges, overpasses, railroad tracks, or parking garages
- Vehicle lurches/decelerates unexpectedly at speed
How to Fix
Have the dealer inspect/recalibrate or replace the distance (radar) sensor assembly and apply any FEB-related ECU software updates per TSB. As an interim measure the FEB/AEB system can be switched off via the settings menu when the false activations are dangerous. Document incidents and check for an extended warranty or class-action remedy on the radar module.
Sources for this issue (3)
Find C1A14 by make
Browse every documented model and issue for your make.
C1A14 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 C1A14 mean?
C1A14 stands for "Front Radar Sensor Beam Axis Not Adjusted." C1A14 is a manufacturer-specific chassis code (documented on Nissan/Infiniti) indicating the front radar sensor's beam axis (aim) has not been adjusted or calibrated. This radar sensor supports advanced driver-assistance features such as adaptive cruise control and forward collision warning/automatic braking. When the sensor is misaligned or its alignment has not been completed, the module disables those ADAS features and sets the code. Often appears after a front-end repair, windshield/bumper work, or a collision. Confirm against the factory manual.
What are the most common causes of C1A14?
The most common causes of C1A14 are: Radar sensor not calibrated/aligned after service, Sensor or bracket physically misaligned, Front-end collision or bumper/grille repair, Damaged sensor or mounting bracket, Damaged wiring or connector, Radar/ADAS control module fault. The specific cause varies by vehicle.
How much does it cost to fix C1A14?
Repair costs for C1A14 range from $250 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by C1A14?
Au7o has documented C1A14 across 2 vehicle models from 2 manufacturers: Lexus, Nissan.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.