U0571 indicates that a control module has received invalid or out-of-range data from the left‑side image processing sensor (typically a forward‑facing camera used for lane‑keep, collision‑avoidance, or similar ADAS functions). The code is set when the sensor’s signal fails plausibility checks, prompting the module to disable the related features.
The camera unit itself may be defective, producing garbled or missing video data that the receiving module cannot interpret.
Open circuits, shorts, corrosion, or loose pins in the harness between the sensor and its control module can corrupt the data stream.
If the camera lens is dirty, covered, or physically shifted, the image data may fall outside expected parameters, triggering an invalid‑data fault.
The module that processes the camera signal may have internal hardware or firmware problems, causing it to misinterpret otherwise good data.
Corrupted software or a missing calibration routine can cause the module to flag valid sensor data as invalid until reflashed or recalibrated.
Although sometimes suggested, the powertrain control module is rarely the source of U0571; it should be considered only after all sensor, wiring, and module checks are exhausted.
No. The powertrain control module is seldom at fault for this code; replacing it without first checking the camera, its wiring, and the image processing module usually does not resolve the issue and can lead to unnecessary expense.
Clearing U0571 without repairing the underlying problem will typically cause the code to return soon after the ADAS system attempts to use the sensor again, and related safety features will remain disabled.
Yes. Most vehicles require a calibration or initialization procedure for the new camera to ensure proper alignment and data output; refer to the manufacturer’s service procedure.
Functions that rely on the left‑side image processing sensor—such as lane‑keep assist, forward collision warning, or automatic emergency braking—will be disabled or may operate unpredictably, so drivers should remain vigilant and consider having the issue repaired promptly.