U026A

Code

Generic U — Network/User

Lost Communication With Image Processing Sensor F

Brand: Generic

Type: U — Network/User

Views: UK: 44 EN: 149 RU: 52

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in sensor communication wiring (CAN/LIN)
Loose, corroded or damaged connector at sensor or gateway/ECU
No power or poor ground to the image processing sensor
Failed or intermittent image processing sensor (hardware or firmware)
Network bus fault (lack of termination, short to battery/ground)
Gateway/module software or configuration mismatch

Symptoms

Instrument cluster/infotainment displays message: Camera/ADAS unavailable
Driver-assist functions reduced or disabled (lane assist, AEB, adaptive cruise)
One or more network communication warnings or MIL illuminated
No camera image available where displayed
Stored U026A (and possibly other network-related) trouble codes

What to check

Read all network modules with a capable scan tool; record freeze frame and related codes
Verify vehicle battery voltage >= 12.4 V and good battery connections
Inspect fuses and relays for circuits feeding the image sensor and gateway
Visually inspect connectors and wiring harness from sensor to gateway/ECU for damage, corrosion or loose pins
Measure sensor power and ground at the sensor connector with connector connected and key on
Check CAN bus termination resistance (approx. 60 Ω between CAN_H and CAN_L with key off) and look for obvious shorts

Signal parameters

CAN idle (recessive) common-mode: ~2.5 V on CAN_H and CAN_L
CAN dominant state: CAN_H ~3.5 V, CAN_L ~1.5 V (differential ≈ 2.0 V)
Typical high-speed CAN bus data rates: commonly 250 kb/s or 500 kb/s (verify vehicle-specific rate)
Expected termination resistance: ~60 Ω measured between CAN_H and CAN_L (two 120 Ω terminators in parallel)
No sustained bus-off condition or continuous dominant state should be present on the bus during normal operation

Diagnostic algorithm

Connect a manufacturer-capable scan tool and confirm U026A is current; record related U-codes and freeze frame data.
Verify battery voltage and check/replace any blown fuses or faulty relays that feed the sensor or network gateway.
Perform a visual inspection of the image processing sensor connector(s) and wiring harness for corrosion, bent pins, or damage; repair as needed.
With ignition on, backprobe the sensor connector and confirm proper power (battery voltage) and a good ground reference at the sensor.
Measure DC resistance between CAN_H and CAN_L at the sensor connector with key off; expect ≈60 Ω. Also check resistance from each line to ground and to battery for shorts.
Use an oscilloscope or CAN bus analyzer at the sensor connector while the network is active to verify proper recessive/dominant voltages, signal edges, and traffic. Look for noise, stuck dominant, or complete absence of traffic.
Perform a wiggle test of harness/connectors while observing the bus and scan tool for intermittent communication. Repair any damaged wiring or connectors found.
If wiring and power/ground are good but communication still fails, try replacing or reprogramming the image processing sensor with a known-good unit (or swap with identical module if available) to confirm module failure.
After repairs or module replacement, clear codes and perform a road or functional test to confirm the fault does not return. Reflash/configure modules if required by manufacturer procedures.
If multiple modules show network errors or bus-off, investigate gateway/module network hardware or consult manufacturer network diagnostics for possible gateway failure.

Likely causes

Disconnected or corroded connector at the image processing sensor
Damaged harness (pinched, cut, chafed) between sensor and gateway
Faulty sensor module (internal failure)
Bus wiring shorted to battery or ground causing bus-off condition
Missing/incorrect module programming after replacement
Weak battery or poor battery connections causing intermittent comms

Fault status

⚠️ Status

Lost Communication With Image Processing Sensor F. The control module is not receiving expected data from the sensor over the vehicle communication bus. ADAS/camera functions may be unavailable until communication is restored.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours