C1A10 on 2023-2025 Lexus RX — Front Radar Sensor / Millimeter Wave Radar Sensor Malfunction
1 vehicles · 1 makes · $250-$1,800 repair
How to diagnose and fix C1A10: most-reported vehicles
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Lexus RX · 2023–2025
Owners of the current-generation RX have reported recurring messages such as 'Pre-Collision System Malfunction,' 'Front Camera Unavailable,' or temporary loss of adaptive cruise and lane functions. These complaints appear in NHTSA filings and owner forums, often after windshield replacement, minor impacts, heavy rain, or sometimes with no obvious trigger. The issue is commonly related to camera/radar obstruction, calibration drift, connector faults, or software sensitivity in the Lexus Safety System+ suite.
Common Symptoms
- Pre-Collision System Malfunction message
- Adaptive cruise control unavailable
- Lane tracing assist unavailable
- Front camera unavailable warning
- Intermittent driver-assistance shutdown
How to Fix
Inspect the windshield camera area and front radar emblem area for dirt, condensation, damage, or non-OEM replacement parts. Perform a scan for ADAS-related DTCs, then complete static/dynamic calibration of the forward recognition camera and millimeter-wave radar if alignment is out of spec. If warnings persist, dealers may apply software updates or replace a faulty sensor/module after confirming power, ground, and network integrity.
Sources for this issue (1)
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C1A10 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 C1A10 mean?
C1A10 stands for "Front Radar Sensor / Millimeter Wave Radar Sensor Malfunction." C1A10 is a manufacturer-specific code (commonly Toyota/Lexus) indicating an internal malfunction of the front millimeter-wave radar sensor assembly. This radar, usually mounted behind the front emblem in the grille, feeds object-detection data to driver-assistance features like adaptive (dynamic radar) cruise control, the pre-collision/automatic emergency braking system, and lane-departure assist. When the module detects the radar is faulty or not responding correctly, it sets this code and typically disables those safety features. It does not affect basic driving but means key crash-avoidance systems may be offline.
What are the most common causes of C1A10?
The most common causes of C1A10 are: Faulty/internally failed millimeter-wave radar sensor, Sensor knocked out of alignment after a front collision or repair, Obstruction on the sensor face (ice, snow, mud, debris, aftermarket emblem), Damaged wiring or corroded connector to the radar, Sensor calibration/aiming not performed after bumper or grille work, Low system voltage or poor ground, Driving-support ECU fault or software issue. The specific cause varies by vehicle.
How much does it cost to fix C1A10?
Repair costs for C1A10 range from $250 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by C1A10?
Au7o has documented C1A10 across 1 vehicle models from 1 manufacturers: Lexus.
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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.