C1A12 on Nissan: How to Diagnose & Fix
Manufacturer-Specific Chassis Code (Nissan/Infiniti: Radar/Laser Sensor Beam Off-Center)
2 Nissan models · 2 documented issues · 2 critical · $250-$1,800 repair
C1A12 on Nissan by model: symptoms, diagnosis and fix
Multiple owners of the current-generation Rogue report the forward collision warning / automatic emergency braking system issuing sudden alerts, disabling itself, or in some cases braking unexpectedly with no obstacle present. Complaints commonly mention 'Front radar unavailable due to obstruction' or related warning messages in clear weather, sometimes recurring after restart. This is a safety-related issue because it can cause abrupt deceleration or loss of driver-assistance functions when expected.
Common Symptoms
- Automatic emergency braking activates with no vehicle ahead
- Forward collision warning chime or dash warning appears unexpectedly
- Front radar obstruction or unavailable message
- ProPILOT Assist disables itself
- Cruise control or driver-assist features become unavailable
How to Fix
Scan the ADAS modules for stored faults, inspect radar sensor mounting and alignment, and verify the front emblem/radar cover is clean and undamaged. Nissan service procedures typically involve radar aiming/calibration, checking harness/connectors, and replacing the radar sensor or related components if faults persist. If the vehicle has collision damage, bumper cover fitment and bracket alignment should be checked carefully because small misalignment can trigger repeated faults.
Owner tips & cautions
- TipClean the front emblem/radar area and inspect for bumper misalignment or prior minor impact before replacing parts; many owners report intermittent warnings caused by sensor aiming issues.
Multiple owners of the current B18-generation Sentra report the Forward Collision Warning and Automatic Emergency Braking systems triggering warnings or braking unexpectedly, sometimes with no vehicle or obstacle present. Complaints describe sudden deceleration, repeated warning messages, and intermittent disabling of driver-assist features. This is a safety-critical issue because false braking or loss of collision mitigation can increase crash risk in traffic.
Common Symptoms
- Front collision warning light illuminated
- Automatic emergency braking activates unexpectedly
- Warning chime with no obstacle ahead
- ADAS features temporarily unavailable
- Cruise or driver-assist functions disabled
How to Fix
Scan the ADAS system for stored faults, inspect the front radar sensor mounting and alignment, and check for contamination, impact damage, or harness issues. Nissan service procedures typically involve radar aiming/calibration and, in some cases, replacement of the radar unit or related sensor hardware if faults persist. Owners should also verify that any applicable software updates or service campaigns have been completed.
Owner tips & cautions
- TipKeep the front radar area clean and inspect for minor bumper damage or misalignment after even light impacts; many owners report intermittent faults after parking-lot contact.
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 Nissan?
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 Nissan it is documented across 2 models: Rogue, Sentra.
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 Nissan?
Published repair estimates on Nissan range from $250 to $1,800 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 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.