U0235

Code

LAND ROVER U — Network/User

Lost communication with the speed control of the distance sensor frontal

Brand: LAND ROVER

Type: U — Network/User

Views: UK: 19 EN: 29 RU: 48

AI status

Completed

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Page language: EN

Causes

Open or short in CAN bus wiring between sensor and network
Corroded, loose or damaged connector at sensor or wiring harness
Loss of module power or ground (blown fuse, poor ground)
Failed frontal distance sensor speed control module
Faulty gateway/ECU or other module interfering with CAN traffic
CAN bus termination fault or bus short to battery/ground

Symptoms

Malfunction indicator lamps related to ADAS/Adaptive Cruise/Collision systems
Adaptive cruise control, distance control or collision avoidance disabled
Warning message on instrument cluster about front sensor or radar
No data from front sensor in diagnostic tool or intermittent data
Possible related system faults (ABS, stability, braking assistance) if shared network

What to check

Read all modules with a capable diagnostic tool; capture freeze frame and related U-codes
Check for additional stored U or B codes in gateway, ABS, ECM, instrument cluster
Visually inspect connectors and wiring at the frontal distance sensor for damage, corrosion, or loose pins
Verify sensor power and ground circuits (check fuses, relays, ground points)
Check CAN-H and CAN-L voltage with key on, engine off and while communicating
Measure resistance across CAN-H to CAN-L with power off (approx. 60 ohms total if two 120Ω terminators present)

Signal parameters

CAN bus idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
CAN dominant state during transmission: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (typical)
Typical high-speed CAN data rates: 500 kbps (some vehicles may use 250 kbps); confirm with vehicle documentation
Bus termination: ~60 Ω measured across CAN_H and CAN_L with ignition off (two parallel 120 Ω terminators)
No communications or repeated error frames when module not responding

Diagnostic algorithm

Connect a diagnostic tool capable of reading Land Rover network modules. Record U0235 and any related codes. Note freeze frame data and timestamps.
Attempt to communicate directly with the frontal distance sensor speed control module. If it does not respond, confirm this on the scope/CAN analyzer.
Inspect sensor connector and harness for physical damage, corrosion, or water ingress. Repair or clean as needed.
Verify sensor power and ground: check fuses/relays and measure voltage to the sensor with ignition on. Repair any power/ground faults.
Check CAN bus voltages at the sensor connector: verify recessive and dominant levels and measure resistance across CAN_H and CAN_L for proper termination.
If voltages or termination are incorrect, trace wiring for short to ground/battery or open circuit. Repair wiring, pins, or connectors as required.
If wiring and bus look correct but module still not communicating, swap or test the sensor on a known-good vehicle harness (if available) or replace sensor module per manufacturer procedure.
After repair, clear codes and perform a test drive/functional test of affected ADAS systems. Re-scan all modules to ensure no further U-codes.
If problems persist, inspect gateway and related ECUs (they may block or filter CAN messages) and consider manufacturer software updates or reprogramming.

Likely causes

Damaged connector or wiring to the frontal distance sensor
Failed frontal distance sensor speed control module
Loss of module ground or blown fuse feeding the sensor
CAN bus wiring short or missing termination resistor

Fault status

⚠️ Status

Lost communication with the frontal distance sensor speed control. The module failed to respond on the vehicle CAN network. ADAS features depending on that sensor may be disabled.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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U0235 — Lost communication with the speed control of the distance sensor frontal