C1A17 on Nissan: How to Diagnose & Fix
Radar / Driver-Assist Sensor Fault
1 Nissan model · 1 documented issue · $200-$1,400 repair
C1A17 on Nissan by model: symptoms, diagnosis and fix
Owners have reported blind spot monitoring and rear cross traffic alert systems giving false warnings, becoming unavailable, or showing persistent malfunction messages on 2020+ Titans. The problem is often linked to rear bumper radar sensor alignment, water intrusion, impact damage from minor bumps, or calibration issues after bumper work. While not usually immobilizing, it disables a key driver-assistance feature and can create nuisance alerts.
Common Symptoms
- blind spot warning unavailable
- rear cross traffic alert malfunction
- false blind spot alerts with no vehicle present
- warning lights in cluster
- ADAS message after minor bumper contact
How to Fix
Diagnosis includes scanning the ADAS modules for radar-related faults, inspecting rear bumper mounting and sensor brackets, checking for moisture or corrosion at connectors, and performing radar aiming/calibration if needed. Repairs may involve sensor replacement, bracket correction, harness repair, or recalibration after body work. Even a slight bumper deformation can affect radar aim enough to trigger warnings.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Nissan early passenger-side blind-spot radar 284K0-9FT0A
Confirm VIN, production date and right-side position; 2022 may use the later 9FV1A family.
- Genuine Nissan early driver-side blind-spot radar 284K1-9FT0A
Confirm VIN, production date and left-side position; 2022 may use 9FV1A.
- Genuine Nissan late passenger-side blind-spot radar 284K0-9FV1A
Confirm VIN/production date and right-side position; do not substitute the early 9FT0A by year guess.
- Genuine Nissan late driver-side blind-spot radar 284K1-9FV1A
Confirm VIN/production date and left-side position; calibration remains mandatory.
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Owner tips & cautions
- TipBefore replacing sensors, inspect for trailer hitch accessories, bumper damage, mud, or aftermarket steps that may interfere with radar operation.
- TipIf the warning started after body work, request radar calibration documentation from the shop.
C1A17 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 C1A17 mean on a Nissan?
C1A17 stands for "Radar / Driver-Assist Sensor Fault." C1A17 is a manufacturer-specific chassis code (documented on Nissan/Infiniti) associated with the front radar/laser driver-assistance sensor system. It generally indicates the module detected a malfunction, blockage, or invalid condition with the collision-avoidance sensor used for features like automatic emergency braking and adaptive cruise control. When set, the affected ADAS features are typically disabled and a warning is displayed. Because this is a manufacturer code, confirm the precise sub-condition against the factory service manual. On Nissan it is documented across 1 model: Titan.
What are the most common causes of C1A17?
The most common causes of C1A17 are: Faulty front radar/laser sensor, Sensor blocked by dirt, ice, or debris, Sensor misalignment or mounting damage, Damaged wiring or connector, Low system voltage or poor ground, Radar/ADAS control module fault. The specific cause varies by vehicle.
How much does it cost to fix C1A17 on a Nissan?
Published repair estimates on Nissan range from $200 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 C1A17 on a different make?
View C1A17 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.