C1A20 on Infiniti: How to Diagnose & Fix
C1A20 — Infiniti-specific definition
1 Infiniti model · 1 documented issue · 1 critical
C1A20 on Infiniti by model: symptoms, diagnosis and fix
Owners have reported unexpected forward collision warnings and abrupt braking events with no obvious obstacle ahead, especially in traffic, on curves, or near roadside objects. These complaints are tied to the QX60's ADAS sensor/camera interpretation rather than a conventional brake hardware fault. Sudden braking can create a rear-impact hazard and is one of the more serious owner-reported safety concerns on the current generation.
Common Symptoms
- Forward collision warning with no vehicle ahead
- Unexpected automatic braking
- Dash warning messages for FEB/AEB or front sensor
- System disables itself after warning
How to Fix
Scan the ADAS system for stored faults and verify radar/camera alignment, windshield condition, and front emblem/radar cleanliness. Infiniti service procedures typically involve checking for software updates, recalibrating the forward camera/radar, and replacing a faulty sensor only after alignment and aiming are confirmed. Owners should document the exact conditions when the event occurs to help reproduce the issue.
Owner tips & cautions
- TipAfter windshield replacement or front-end work, insist on proper ADAS calibration rather than assuming the system will self-learn.
Sources for this issue (1)
C1A20 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 C1A20 mean on a Infiniti?
On Infiniti, C1A20: No Infiniti/Nissan definition of C1A20 was found; neighbouring Nissan ADAS codes in the C1A1x/C1A2x range (e.g. C1A21 'UNIT HIGH TEMP' on the 2011 M37, seen in search results) are ICC/distance-sensor codes. The model-year ESM is needed to confirm whether C1A20 exists on Infiniti. On Infiniti it is documented across 1 model: QX60.
How much does it cost to fix C1A20 on a Infiniti?
Repair costs vary widely with the root cause and Infiniti model; each issue on this page carries its own estimate where one is published.
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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.