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Home / DTC / U0246 — Lost Communication With “Seat Control Module E”

U0246 — Lost Communication With “Seat Control Module E”

Detailed page for trouble code U0246.

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Code

U0246

HYUNDAI U — Network/User

Lost Communication With “Seat Control Module E”

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

Causes

  • Faulty Seat Control Module E (internal failure)
  • Power supply or ground open/poor connection to the seat module
  • Damaged, corroded or disconnected connector(s) at the seat module
  • Open/shorted/high-resistance wiring on the communication bus (CAN or LIN) between the module and gateway/BCM
  • Faulty gateway/BCM or other module that routes messages
  • Bus termination fault or short to battery/ground on network wiring

Symptoms

  • Seat E functions inoperative (adjustment, heating, ventilation, memory) or intermittent
  • Diagnostic scanner shows U0246 or related network communication errors for seat module E
  • Other modules report communication errors or related features inoperative
  • Possible stored ancillary codes for related seat features (airbag/occupant detection warnings if integrated)
  • No data stream from Seat Control Module E on the network when monitored with a scan tool

What to check

  • Retrieve freeze frame and full DTC list with a capable scan tool; record active and history codes
  • Verify ignition state and attempt to wake the network (cycle key, operate a control to wake module)
  • Visually inspect seat connectors, wiring harness, and junctions for damage, corrosion, or water intrusion
  • Check fuses and relays that supply power to the seat module(s)
  • Backprobe the seat module connector(s): verify battery voltage on supply pins and near 0V on ground pins
  • Measure CAN or LIN bus voltages at the seat module connector with key ON (see signal params)

Signal parameters

  • CAN bus (if used): Idle/recessive voltage ~2.5 V on both CAN_H and CAN_L; dominant state: CAN_H rises (~3.5–4.0 V) and CAN_L falls (~1.0–1.5 V); typical differential when dominant ~2 V
  • CAN bus bit rates commonly 500 kbps or 250 kbps depending on vehicle network
  • LIN bus (if used): idle at battery voltage (pulled high), dominant pulled to ~0 V; typical LIN baud ~10.4 kbps
  • Module supply pin: B+ ≈ battery voltage (12 V nominal, 13–14 V with engine running)
  • Module ground pin: ≈ 0 V (low millivolts under load)
  • Termination resistance for high-speed CAN: approx. 60 Ω measured across CAN_H and CAN_L (two 120 Ω terminators in parallel)

Diagnostic algorithm

  1. Connect a diagnostic scanner and read all codes. Note whether U0246 is current or history and if other U-codes are present.
  2. Attempt to communicate directly with Seat Control Module E. If no response, confirm other modules on same bus are communicating.
  3. Verify power and ground at the seat module connector with key ON. Repair any blown fuse, open power, or poor ground before further testing.
  4. Visually inspect and gently flex the seat harness and connector while monitoring for communication to find intermittent faults.
  5. Measure CAN_H and CAN_L (or LIN) at the module while a known-good module or scanner is communicating on the bus. Look for idle voltages and data transitions. If the bus is silent, check upstream wiring and gateway.
  6. Check termination resistance across CAN_H and CAN_L with power off (≈60 Ω). If open or shorted, isolate and repair wiring harness or replace faulty terminator.
  7. If power/ground and bus signals are good at the connector but the module does not respond, try waking or cycling the module (battery disconnect or ignition cycles may be required) and check for available software updates or TSBs.
  8. If available, swap with a known-good seat control module (or bench test the suspect module) if allowed by manufacturer procedures to confirm module failure.
  9. After repairs, clear codes and perform functional tests of seat functions and re-scan to confirm U0246 does not return. If reprogramming is required, follow OEM procedures.

Likely causes

  • Connector pin corrosion or poor mating at Seat Control Module E
  • Loss of module power or ground (blown fuse, poor splice)
  • Open or short in CAN/LIN communication wiring near the seat or under-hood harness
  • Defective seat control module
  • Gateway/BCM not forwarding messages or bus fault (short or missing termination)

Fault status

⚠️ Status
Lost communication with Seat Control Module E — module not responding on vehicle network (U0246).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

U0244 U0245 U0247 U0100 U0121
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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