U026C

Code

Generic U — Network/User

Lost Communication With Image Processing Sensor H

Brand: Generic

Type: U — Network/User

Views: UK: 28 EN: 39 RU: 28

AI status

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Page language: EN

DTC U026C stored in one or more modules
Warning message or amber/red camera/ADAS indicator on dash or infotainment
Related driver assistance features disabled or degraded (lane-keeping, automatic braking, adaptive cruise)
Intermittent operation of camera-based systems or sudden loss during driving
No image/video feed available where applicable

Read all stored DTCs and freeze frame data with a capable scan tool
Check for additional body/network communication codes (U0100, U0121, U0140, etc.)
Verify battery voltage is within specifications (typically 12.5–14.5 V) and check for recent low-voltage events
Visually inspect connectors and wiring at Image Processing Sensor H for corrosion, looseness, or damage
Inspect fuses/relays that feed the sensor and related modules
Scan for the camera/module on the CAN/LIN network; verify it shows as active and check message IDs

Network type: CAN (most common) or LIN (vehicle-specific)
CAN bus idle differential ~0 V? (actually ~0 V differential; CANH ≈ CANL ≈ 2.5 V), dominant/idle voltages: CANH ~3.5 V, CANL ~1.5 V when active
Message identifier (arbitration ID) used by Image Processing Sensor H — check OEM message list
Message update rate: camera data typically periodic (e.g., 10–30 Hz) or on-demand
Data length code (DLC) and expected payload layout per OEM specification
Supply voltage to sensor (Vbat) — should be stable within normal operating range

Retrieve U026C and all other network/module DTCs; record freeze frame and last occurrence conditions.
Confirm vehicle battery state and perform a system reboot (clear codes, cycle power) to rule out transient event.
Use a diagnostic tool to query the image-processing sensor node: verify presence, software ID, and last communication timestamp.
Visually inspect the sensor connector, wiring harness along its routing, and any junctions or splices for damage, corrosion, or moisture. Repair as needed.
Check power and ground at the sensor connector: verify fuse/relay continuity and Vbat at ignition on.
With ignition on, monitor CAN/LIN bus traffic. If the sensor does not appear on the bus, check wiring continuity from the module to the main harness and measure CANH/CANL with a multimeter/oscilloscope for proper idle and dominant waveforms.
Measure termination resistance across CANH–CANL near the sensor and at the gateway (≈60 ohms). Investigate discrepancies.
If wiring and power/ground are good but the sensor remains unresponsive, swap with a known-good identical sensor (if available) or bench-test sensor per OEM procedure.
If a replacement sensor solves the issue, clear codes and confirm proper operation of camera systems. If not, investigate gateway/module software, harness continuity to gateway, or other nodes on the same bus.
After repair, road-test and re-scan to ensure no recurrence; check for required module programming or calibration of the new sensor.