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Home / DTC / U0248 — Lost communication with the remote control utility module

U0248 — Lost communication with the remote control utility module

Detailed page for trouble code U0248.

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Code

U0248

LAND ROVER U — Network/User

Lost communication with the remote control utility module

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

Causes

  • Blown fuse or disabled power supply to the RCUM
  • Poor ground or intermittent connector at the RCUM
  • Open/short in CAN/LIN wiring between RCUM and network
  • Faulty RCUM (internal failure)
  • Network bus wiring shorted to battery/ground or each other
  • Missing or corrupted module programming/coding

Symptoms

  • No response to remote/keyless entry or intermittent remote operation
  • Central locking, alarm, or convenience lighting fail or behave unpredictably
  • Other modules show related U-codes or missing node on network scan
  • Keyless start/immobilizer symptoms if RCUM interfaces with security
  • Stored network communication errors in multiple modules

What to check

  • Read all stored DTCs and freeze frame data from all modules with an OEM-capable scan tool
  • Check battery voltage and state of charge (12.4–12.8 V at rest; >12 V with key on)
  • Inspect fuses and relays supplying the RCUM
  • Visually inspect RCUM connector(s) and wiring for corrosion, bent pins, water ingress or damage
  • Perform a network node scan to confirm whether RCUM appears on the bus
  • Measure CAN/LIN idle voltages at the RCUM connector with key on and ignition off as appropriate

Signal parameters

  • Battery voltage (typical nominal 12–14.5 V during cranking/charging)
  • CAN_H idle voltage ≈ 2.5–3.5 V, CAN_L idle voltage ≈ 1.5–2.5 V (verify against service manual)
  • Differential CAN voltage idle ≈ 0 V; dominant state produces ≈2 V differential
  • Bus termination resistance ≈ 60 Ω (measure across CAN_H and CAN_L)
  • LIN line idle ≈ battery voltage or specified LIN idle per manufacturer (verify service doc)
  • Module presence/heartbeat messages frequency — compare to reference data in factory manual

Diagnostic algorithm

  1. Connect an OEM-capable diagnostic tool and perform a full network scan; record U0248 and any other communication codes or missing nodes.
  2. Verify battery voltage and stable supply; charge or support battery if low before testing.
  3. Inspect fuses/relays for RCUM power circuit and test for continuity/power at the RCUM supply pin with ignition on.
  4. Visually inspect RCUM connector and wiring harness for damage, corrosion or moisture; repair or clean as needed.
  5. Measure CAN_H and CAN_L voltages at the RCUM connector with key on; compare to known-good values in the service manual.
  6. Check termination resistance across CAN_H and CAN_L with power off; look for open or incorrect termination values (~60 Ω).
  7. If wiring and network parameters are good, perform a wiggle/driveability test while monitoring live network traffic for intermittent faults.
  8. If the RCUM is not present on the bus but supply and ground are correct, try swapping a known-good module (if available) or bench-test the module per OEM procedure.
  9. Reflash or reprogram the RCUM if software corruption is suspected and re-code to vehicle configuration as required by manufacturer procedures.
  10. After repairs, clear codes and perform a functional test of remote/keyless functions and a fresh network scan; monitor for reappearance of U0248.

Likely causes

  • Lost power or ground at the RCUM (fuse, connector, corrosion)
  • Damaged or disconnected CAN/LIN wiring between RCUM and gateway/module cluster
  • Faulty RCUM hardware or corrupted software requiring reflash/replacement
  • Bus-level fault (short to battery/ground, missing termination)

Fault status

⚠️ Status
Lost communication with Remote Control Utility Module — module not responding on vehicle network or timeout on data bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0100 U0121 U0155 U0235 U0251
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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