U0268

Code

Generic U — Network/User

Lost Communication With Image Processing Sensor D

Brand: Generic

Type: U — Network/User

Views: UK: 25 EN: 49 RU: 27

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Faulty image-processing sensor (camera) D
Intermittent or open/short in wiring harness between sensor D and network gateway/ECU
Poor connector contact or corrosion at sensor or gateway
Blown fuse or missing module power/ground to sensor D
CAN/LIN bus physical layer fault (open, short, missing termination)
Software/configuration mismatch or corrupted module firmware

Camera or image-based displays blank, distorted, or intermittent
Driver assistance features degraded or unavailable (lane keep, automatic braking, adaptive cruise)
Associated warning lights/messages on dash (camera/ADAS fault)
Other modules report communication errors or multiple U-codes

Read and record all stored DTCs and freeze frame data with a capable scan tool
Check for related codes in camera, ADAS, gateway and BCM modules
Visually inspect connectors and wiring for sensor D for corrosion, damage, or loose pins
Verify fuses and power/ground circuits supplying sensor D
Check for presence of CAN (or LIN) messages from sensor D using a scan tool or bus monitor
Perform a wiggle test on harness while monitoring communication to reproduce intermittent failures

Power supply to sensor D: nominal vehicle system voltage (approx. 12 V) present at ignition on
Ground continuity from sensor D to chassis ground
CAN bus idle differential: both CAN H and CAN L near ~2.5 V (no bus activity) and expected differential pulses when active
CAN termination: combined bus resistance ≈ 60 Ω across CAN H and CAN L at key points
Expected message frequency: camera/vision messages typically periodic (e.g., single-digit to low-hundred Hz) — verify presence/absence with scan tool
Connector pin signal integrity: continuity and no high resistance (

Retrieve all DTCs and note time/date/ignition state. Check for permanent/active/inactive status and related codes.
Attempt to command or interrogate camera/sensor D from a diagnostic tool to confirm lack of response.
Visually inspect sensor D connector and wiring for corrosion, bent pins, broken locking tangs, or water ingress. Repair as needed.
Verify fuses and measure battery voltage at the sensor harness power pin with ignition on. Check ground at sensor for low resistance to chassis.
With a scan tool or CAN bus monitor, observe bus traffic. Look for messages from sensor D; if none, check whether other modules can communicate on the same bus.
Check physical layer: measure CAN H and CAN L voltages, and measure bus resistance across CAN H/L with power off to confirm ~60 Ω. Use oscilloscope to view message waveforms if available.
Perform continuity/resistance checks between sensor D pins and the gateway/ECU harness pins to locate opens or high resistance. Repair wiring faults as found.
If intermittent, perform wiggle/road test while monitoring communications to reproduce the fault.
If wiring and bus are good but no communication, consider replacing sensor D with a known-good unit or bench-test the module per manufacturer procedures. Reflash or update module software if updates are available.
Clear codes and verify repair by cycling ignition and rechecking for reappearance of U0268 and associated symptoms.