What it means
A receiving control module has detected invalid data from Image Processing Sensor L. The code does not specify which data is invalid or why.
How it works
Image Processing Sensor L supplies image-related data to other vehicle modules over the communications network. A receiving module sets U0571 when the data attributed to Sensor L is present but fails its validity checks; the code does not identify the bad value or prove the sensor itself is faulty.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Record all modules' codes and freeze-frame details first, because related network or image-system faults may show whether this is isolated to Sensor L.
- Check the vehicle's display and image-based functions for faults associated with Sensor L, and note when they fail.
- Inspect the sensor's connectors and nearby harness for looseness, damage, moisture, or evidence of recent repair.
- Use a capable scan tool to compare Sensor L data with related image-system data and check whether the receiving module reports implausible or missing values.
- Check for applicable software or configuration updates, especially if a sensor or module was recently replaced.
- If wiring and software checks do not explain the fault, have the Sensor L and receiving-module network communication assessed against the manufacturer's diagnostic procedure.
Common fixes
- Repair a loose, damaged, or contaminated Sensor L connector.
- Repair damaged wiring between Sensor L and its connected system.
- Apply the correct software update or configuration after replacement, if applicable.
- Replace Sensor L only if testing confirms its output is invalid.
- Repair or replace the affected module or gateway only if testing identifies it as the source.
Can I keep driving?
If image-based features are unreliable, avoid relying on them and drive only if visibility and other safety systems remain adequate. If warnings affect driver assistance or visibility, stop using those features and arrange prompt diagnosis.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.