C1A11 Code - Front Radar Sensor Incorrect Axial Gap
Quick Answer
For vehicles with Dynamic Radar Cruise Control System: The Driving Support ECU Assembly uses the Millimeter Wave Radar Sensor Assembly to detect objects in front of the vehicle. Common causes include Faulty Millimeter Wave Radar Sensor Assembly, Millimeter Wave Radar Sensor Assembly harness is open or shorted, Millimeter Wave Radar Sensor Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C1A11 indicates Front Radar Sensor Incorrect Axial Gap.
- Common causes
- Common causes include Faulty Millimeter Wave Radar Sensor Assembly, Millimeter Wave Radar Sensor Assembly harness is open or shorted, Millimeter Wave Radar Sensor Assembly circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code C1A11 Description
For vehicles with Forward Recognition Camera System: The Forward Recognition Camera uses the Millimeter Wave Radar Sensor Assembly to detect obstacles in front of the vehicle. When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor etc., the Millimeter Wave Radar Sensor Assembly performs self-diagnosis to check if the sensor beam axis has deviated from the vehicle movement direction. When the Millimeter Wave Radar Sensor Assembly beam axis has deviated, the Forward Recognition Camera detects this, and stores DTC C1A11. After installing a new Millimeter Wave Radar Sensor Assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.
For vehicles with Lane Departure Alert System (W/ Steering Control): The Forward Recognition Camera uses the Millimeter Wave Radar Sensor Assembly to detect obstacles in front of the vehicle. When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor etc., the Millimeter Wave Radar Sensor Assembly performs self-diagnosis to check if the sensor beam axis has deviated from the vehicle movement direction. When the Millimeter Wave Radar Sensor Assembly beam axis has deviated, the Forward Recognition Camera detects this, and stores DTC C1A11.
After installing a new Millimeter Wave Radar Sensor Assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.
For vehicles with Pre-collision System: The Driving Support ECU Assembly uses the Millimeter Wave Radar Sensor Assembly to detect obstacles in front of the vehicle. Based on this information, the Driving Support ECU Assembly sends pre-collision control operation signals. When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the airbag sensor assembly etc., the Millimeter Wave Radar Sensor Assembly performs self-diagnosis to check if the sensor beam axis has deviated from the vehicle movement direction. When the Millimeter Wave Radar Sensor Assembly beam axis has deviated, the Driving Support ECU Assembly detects this, and stores DTC C1A11. After installing a new Millimeter Wave Radar Sensor Assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.
What are the Possible Causes of the DTC C1A11?
- Faulty Millimeter Wave Radar Sensor Assembly
- Millimeter Wave Radar Sensor Assembly harness is open or shorted
- Millimeter Wave Radar Sensor Assembly circuit poor electrical connection
- Faulty Forward Recognition Camera (If equipped)
- Faulty Driving Support ECU Assembly
How to Fix the DTC C1A11?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
When the Millimeter Wave Radar Sensor Assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
If the Forward Recognition Camera has been replaced with a new one, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1A11 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- C1A11 Lexus — Front Radar Sensor Incorrect Axial Gap
- C1A11 Toyota — Front Radar Sensor Incorrect Axial Gap
Frequently Asked Questions about C1A11 Code
1. What are the common symptoms of OBDII code C1A11 (Front Radar Sensor Incorrect Axial Gap)?
- Common symptoms include the malfunction indicator light (MIL) turning on, issues with adaptive cruise control, and potential loss of collision warning functionality.
2. What can cause the OBDII code C1A11 to trigger?
- The code C1A11 is typically triggered when the front radar sensor detects an incorrect axial gap, which may be caused by sensor misalignment, physical damage, or calibration issues.
3. How can I diagnose the Front Radar Sensor Incorrect Axial Gap issue?
- Diagnosis involves visually inspecting the front radar sensor for any physical damage, ensuring proper alignment, and performing calibration using specialized equipment.
4. Is it safe to continue driving with OBDII code C1A11 present?
- While the vehicle may still be operable, it is recommended to address the issue promptly to maintain the proper functioning of safety systems like adaptive cruise control and collision warning.
5. Can I repair the Front Radar Sensor Incorrect Axial Gap issue myself?
- Repairing the issue may require specialized tools and expertise, so it is advisable to consult with a professional technician or dealership for proper diagnosis and repair.
6. How much does it typically cost to fix OBDII code C1A11?
- The cost of repair can vary depending on the underlying cause of the issue, but it may involve sensor realignment, calibration, or even sensor replacement, which can range from a few hundred to over a thousand dollars.
7. Will resetting the OBDII code C1A11 make it go away permanently?
- Resetting the code may temporarily clear the MIL, but if the root cause of the issue is not addressed, the code is likely to reappear once the system detects the fault again.
8. Can environmental factors affect the Front Radar Sensor Incorrect Axial Gap?
- Yes, factors such as extreme weather conditions, road debris, or improper sensor cleaning can impact the performance of the front radar sensor and potentially trigger the C1A11 code.
9. How long does it take to fix the Front Radar Sensor Incorrect Axial Gap issue?
- The repair time can vary based on the specific cause of the problem, but it may take a few hours to a day for diagnosis, calibration, and potential sensor replacement, if needed.
10. Are there any preventive measures to avoid OBDII code C1A11 in the future?
- Regular maintenance, keeping the front radar sensor clean, and avoiding impacts to the sensor area can help prevent issues leading to the Front Radar Sensor Incorrect Axial Gap fault code.
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