C1AC1 2016 Toyota RAV4 Code - Master Module Horizontal Axis Misalignment

The code C1AC1 indicates a "Master Module Horizontal Axis Misalignment," meaning the forward recognition camera may be misaligned or improperly calibrated.

Common symptoms include malfunctioning lane departure alerts, adaptive cruise control issues, and warning lights on the dashboard related to the Toyota Safety Sense system.

This code is often caused by improper calibration of the forward recognition camera, damage to the windshield, or physical misalignment due to an accident or windshield replacement.

While a dirty windshield can affect camera performance, it doesn’t typically cause this specific code. However, it’s good practice to keep the windshield clear to avoid other issues.

A technician will use a scan tool to confirm the code, inspect the forward recognition camera alignment, and check for physical damage or previous windshield replacements.

You can drive, but advanced driver-assistance systems like lane departure warning or adaptive cruise control may not function properly, which could compromise safety.

Common fixes include recalibrating the forward recognition camera using a Toyota scan tool, repairing or replacing the camera, or addressing windshield alignment issues.

Yes, replacing the windshield can trigger this code if the forward recognition camera is not recalibrated afterward.

The cost typically ranges from $150 to $300 for recalibration, but it can be higher if parts like the camera need replacement.

Clearing the code without addressing the root cause will only result in the code returning. Proper diagnosis and repair are necessary to resolve the issue.