C1A14 on Nissan: How to Diagnose & Fix
Front Radar Sensor Beam Axis Not Adjusted
1 Nissan model · 1 documented issue · 1 critical · $600-$1,400 repair
C1A14 on Nissan by model: symptoms, diagnosis and fix
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 28438-5UD2A) 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.
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 (3)
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 on a Nissan?
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. On Nissan it is documented across 1 model: Sentra.
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 on a Nissan?
Published repair estimates on Nissan range from $600 to $1,400 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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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.