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Home / DTC / U100B — Semi-automatic parallel parking system

U100B — Semi-automatic parallel parking system

Detailed page for trouble code U100B.

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Code

U100B

LAND ROVER U — Network/User

Semi-automatic parallel parking system

Brand: LAND ROVER
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or failed CAN/LIN communication between the park assist module and other control modules
  • Faulty park assist control module (hardware or internal software)
  • Damaged or corroded wiring, connectors, or terminals for the park assist module or CAN bus
  • Low or unstable battery/vehicle supply voltage or poor ground connection
  • Faulty ultrasonic sensors, parking sensors, or associated harnesses causing module errors
  • Software version mismatch or missing calibration/ECU update

Symptoms

  • Semi-automatic parallel parking function unavailable or disabled
  • Instrument cluster or message center displays parking system warning or fault message
  • Parking assistance lights or dashboard warning lamp illuminated
  • Reduced or no response from parking sensors (audible/visual) when parking
  • Intermittent operation of park assist (works sometimes, fails others)

What to check

  • Read and record all stored and pending DTCs from all modules with a capable diagnostic tool (do not rely on dash messages alone)
  • Check for presence of the park assist module on the vehicle network (module ID and firmware version)
  • Inspect battery voltage and ground connections; record voltage during attempts to operate park assist
  • Visually inspect connectors, wiring, and harnesses for damage, corrosion, water ingress or rodent damage around park assist module and sensors
  • Perform wiggle/pressure tests on harness/connectors while monitoring live data for communication drops
  • Check CAN bus wiring for continuity/short to ground/power and correct termination resistance (~60 ohm between CAN_H and CAN_L across network when modules connected)

Signal parameters

  • CAN bus: presence of CAN_H/CAN_L differential activity and nominal voltages (~2.5 V average, ~2.5±1 V swing)
  • Module presence: park assist module ID and firmware version visible on scan tool
  • Park assist status messages: 'ready', 'fault', 'disabled' flags from module
  • Ultrasonic sensor raw distance/echo values and sensor status bits
  • Vehicle speed, steering wheel angle, and brake switch status (park assist interlocks)
  • Battery voltage and ground circuit voltage during operation attempts

Diagnostic algorithm

  1. Connect a dealer-capable or manufacturer-level diagnostic tool; read/record all U100B and related faults from park assist and gateway modules
  2. Clear codes and attempt to reproduce the fault to confirm persistent failure (record live data during test)
  3. Verify module is present on the network and check software/firmware level against latest service bulletins; re-flash or update if recommended by manufacturer
  4. Inspect and secure all connectors and grounds for the park assist module and sensors; repair any damage and re-test
  5. Measure CAN_H and CAN_L voltages and verify differential activity with oscilloscope or supported diagnostic tool; repair wiring faults or poor terminations
  6. Check power and ground at the park assist module (fuse, connector pin voltages) and repair as required
  7. Test ultrasonic sensors and harness for shorts/opens; replace any sensor that fails bench/ohmmeter checks or shows inconsistent live data
  8. If wiring and sensors are good but communication faults persist, consider replacing the park assist control module; perform programming/configuration per manufacturer procedures after replacement
  9. After any repair, clear codes and carry out full system calibration and a functional road/park test to verify correct operation
  10. If the fault is intermittent or not replicated, advise vehicle use monitoring and collect freeze-frame logs or extended data for manufacturer support or Technical Service Bulletin (TSB) consultation

Likely causes

  • Loose or corroded connector at the parking assist module or CAN junction
  • Open/short in CAN_H or CAN_L wiring near module or harness chafe points
  • Park assist module power or ground fault (fuse, connector, wiring)
  • Module software fault requiring reflash or calibration
  • Failed ultrasonic sensor(s) causing the module to enter a fault state

Fault status

⚠️ Status
Communication fault detected between the semi-automatic parallel parking control module and the vehicle network or other control modules. The parking assist function may be disabled or degraded until communication, power/ground, or the module itself is repaired or updated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

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320

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