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 28438-5UD0A) 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)
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.
Looking for C1A14 on a different make?
View C1A14 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.