U0266

Code

Generic U — Network/User

Lost Communication With Image Processing Sensor B

Brand: Generic

Type: U — Network/User

Views: UK: 29 EN: 54 RU: 33

AI status

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Page language: EN

Causes

Image Processing Sensor B internal failure
Open/short or high resistance in CAN/data wiring or connector
Corroded, loose, or damaged connector pins
Loss of sensor power or ground
Network bus termination or wiring fault (short to battery/ground)
Multiple modules on same bus causing errors or bus flooding

Symptoms

Warning lamp or message related to camera/driver assistance systems
Loss or degradation of features that rely on the image sensor (lane assist, AEB, adaptive lighting)
Stored network communication fault codes
Intermittent operation of camera functions or sporadic faults
No live camera image available in diagnostic scan tool

What to check

Read and record all current and pending DTCs from all modules; note freeze frame if available
Check for related U-codes on the same data bus (bus-wide failure vs single node)
Visually inspect the camera, connector, and harness for damage, corrosion, or water intrusion
Check camera supply voltage and ground with key ON and engine OFF
Use a scan tool to verify whether the camera responds to requests and whether image/data is present
Check CAN/LIN bus voltage levels and termination (approx. 2.5 V bias on each line, differential behavior)

Signal parameters

Expected periodic data/heartbeat from Image Processing Sensor B on vehicle network (CAN/CAN-FD/LIN depending on vehicle)
Heartbeat frequency typically 1–10 Hz for status; image/processing data frames may be higher/burst
CAN differential voltage present on CAN_H and CAN_L with ~2.5 V idle bias and ~60 Ω total termination
Data payload contains status flags, checksum/CRC and sequence information — missing frames or checksum errors indicate communication faults
Bus error counters/diagnostics visible in advanced scan tools/oscilloscope

Diagnostic algorithm

Retrieve codes and freeze frame data from all modules; note whether code is current or intermittent.
Confirm vehicle battery voltage is within specification; low voltage can cause communication timeouts.
Perform visual inspection of the Image Processing Sensor B connector and wiring harness for damage, corrosion, water, or loose pins.
With a suitable scan tool, attempt to communicate with the Image Processing Sensor B. If the sensor is completely unresponsive, proceed to power/ground and wiring checks.
Verify sensor power and ground at the sensor connector with key ON. If power or ground missing, trace back to source and repair.
Check CAN/LIN lines at the sensor connector with a multimeter/oscilloscope for proper idle voltages and differential signals. Look for shorts to battery/ground or open circuits.
If bus voltages are abnormal, isolate sections of the bus (disconnect suspect nodes) to find a component causing bus faults. Check for proper termination resistances (~60 ohm across CAN high/low).
Perform wiggle/stress tests on harness/connectors while monitoring communication to find intermittent faults.
If wiring and power are good but the sensor remains unresponsive, swap in a known-good sensor (if available) or try plugging the sensor into a different, known-good socket if policy allows.
Check for and apply any available software/firmware updates or calibrations for the camera and master module. Reprogram or code replaced modules as required.
Clear codes and road test to verify repair. If code returns, capture live data and oscilloscope traces for further analysis or escalate to manufacturer technical support.