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Home / DTC / U0247 — Lost Communication With “Seat Control Module F”

U0247 — Lost Communication With “Seat Control Module F”

Detailed page for trouble code U0247.

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11,925generic
22,851specific
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Code

U0247

HYUNDAI U — Network/User

Lost Communication With “Seat Control Module F”

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

Causes

  • Open or shorted wiring between the seat module and the vehicle data bus
  • Failed or intermittent seat control module
  • Loss of module power (blown fuse, open supply, poor battery/GND connection)
  • Corroded or loose connector(s) at the seat module or gateway module
  • Faulty gateway/module that routes messages (BCM, gateway ECU)
  • Missing or corrupted software/calibration or incompatible replacement module

Symptoms

  • One or more seat functions inoperative (adjustment, heating, memory)
  • Other modules showing related communication DTCs
  • Reduced or disabled seat safety features (seatbelt pretensioner, occupant classification) depending on system
  • Instrument cluster or body modules show communication warnings or service messages
  • Intermittent operation of seat features or faults that clear and return

What to check

  • Scan vehicle with a capable OBD-II/CAN scanner and capture freeze frame and related U-/B-/P-codes
  • Check battery voltage and main fuses; ensure battery >12.4V during testing
  • Visually inspect connectors, pins and wiring at the seat module and any intermediate junctions
  • Check fuse(s) and relay(s) for the seat module power circuit
  • Measure supply voltage and ground at the module connector with a DVOM
  • Check CAN/LIN bus voltage levels at the module connector before and after ignition ON

Signal parameters

  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive); dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
  • Expected differential when active ≈ 2 V; no large DC offset to chassis
  • Check for correct bus termination (~60 ohm between CAN_H and CAN_L) at network ends
  • Seat module should transmit periodic CAN frames or respond to diagnostic requests — message frequency and IDs available from OEM data
  • LIN networks: idle bus ≈ battery voltage via pull-up; wake pulse characteristics per OEM documentation

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame data from all modules. Note related U-codes and any power/ground codes.
  2. Confirm battery voltage stable and check/replace blown fuses for seat power circuits.
  3. Perform a visual inspection of the seat module connector(s) and harness for damage, corrosion, or disconnection. Repair as needed.
  4. With ignition ON (per OEM procedure), measure module supply voltage and ground at the connector. If supply missing, trace and repair power feed or fuse.
  5. Check CAN (or LIN) voltages at the module connector. If bus voltages are abnormal, isolate sections of the bus to find a short/open or missing termination.
  6. Use a scan tool or CAN bus analyzer to look for the seat module’s CAN IDs or to send a diagnostic request. If module never responds, suspect wiring or module fault.
  7. Wiggle-testing: with scanner monitoring comms, gently manipulate harness and connectors to reproduce intermittent faults. Repair any wiring faults found.
  8. If wiring and supply are good but no communication, follow OEM procedure for reprogramming or reinitialization — some modules require coding or matching after replacement.
  9. If ECU suspected failed, substitute with known-good module only after verifying wiring and software compatibility. Reprogram/configure as required.
  10. Clear codes and perform functional test/road test to verify repair. Re-scan to confirm DTC does not return.

Likely causes

  • Connector at the seat module is loose, pushed out, or has corroded pins
  • Blown fuse or removed power supply to the seat control module
  • Short to battery or ground on CAN/LIN wiring causing bus failure
  • Seat control module internal hardware failure
  • Gateway or body control module not forwarding messages due to internal fault or low voltage

Fault status

⚠️ Status
Lost communication with Seat Control Module F — seat module not responding on vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0246 U0248 U0155 U0100 U0121
371

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