U0571

Code

Generic U — Network/User

Invalid Data Received From Image Processing Sensor L

Brand: Generic

Type: U — Network/User

Views: UK: 24 EN: 34 RU: 28

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Page language: EN

Causes

Faulty left image-processing camera/module (hardware failure)
Corroded, loose, or damaged connector or wiring harness to the sensor
Power supply (12V) or ground fault at the sensor
Intermittent or broken CAN/LIN bus communication (open, short, high resistance, missing termination)
Software/firmware mismatch or corrupted calibration data in the sensor or receiving module
Water intrusion, contamination, or mechanical damage to the sensor

Symptoms

ADAS warnings or message like 'Camera Fault', 'Lane Assist Unavailable', or 'Service ADAS'
Reduced or disabled functions that rely on the left camera (lane-keeping, traffic sign recognition, automatic high beam, etc.)
Malfunction indicator lamp (MIL) or instrument cluster message in some vehicles
Intermittent or persistent fault memory for camera or network modules
Visible contamination, misalignment, or damage to the left camera lens/housing

What to check

Read and record all stored codes and freeze-frame data from ADAS, body, and powertrain modules
Visual inspection of the left camera: lens, housing, mounting, and sealing for damage or contamination
Inspect connector and pins for corrosion, bent pins, pushed-out terminals, water intrusion, or poor retention
Check sensor supply voltage and ground at the connector with key on; compare to factory spec (approx. vehicle battery 12V)
Scan tool: monitor live CAN/LIN traffic, message rates, and error counters for the left camera ID
Wiggle test wiring and connectors while monitoring data and code occurrence to identify intermittent faults

Signal parameters

Presence of camera-specific CAN message ID(s) on bus and expected message frequency (check manufacturer spec; typically repeated at specific Hz)
Message payload validity: checksum/CRC, timestamp/sequence increment, and data field ranges
CAN bus voltage levels and waveform integrity (dominant/recessive signals ~0–5V differential depending on hardware)
Error frame and bus-off counters for CAN transceivers
Sensor supply voltage (nominal battery voltage ~12V) and ground continuity
Percent of corrupted or invalid packets (communication error rate) seen by scan tool

Diagnostic algorithm

Use a capable scan tool to read U0571 and any related codes from all modules. Note freeze-frame and occurrence conditions.
Check TSBs and software updates for the left image-processing sensor and ADAS modules. Update/reflash if recommended.
Visually inspect the left camera, bracket, and lens. Clean lens if contaminated. Check mounting and alignment marks.
Inspect the camera connector and wiring harness for damage, corrosion, moisture, or loose pins. Repair or replace damaged wiring/connectors.
With a meter or oscilloscope, verify sensor supply voltage and ground at the connector with ignition on and during fault reproduction; repair poor grounds or supply issues.
Monitor the vehicle data bus with a scan tool or CAN analyzer: confirm camera message ID is present, check message frequency, CRC/checksum validity and look for bus errors. Repair bus faults (shorts, opens, bad termination).
Perform a wiggle/test while monitoring live data to find intermittent wiring or connector problems. Secure or replace any failing components.
If wiring and power/ground are good but messages are invalid or absent, swap in a known-good camera (if available) or replace the camera module. Reboot and re-scan.
After repair or replacement, clear codes and perform functional tests / relearn/calibration procedures required by the manufacturer (camera alignment/calibration may be mandatory).
Recheck for recurrence after a road test and verify that ADAS functions operate normally. Document any persistent network errors for deeper module-level diagnosis.