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

Generic U — Network/User

Lost Communication With Seat Control Module E

AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Seat Control Module E failed (internal electronics or software).
  • Open or short in CAN bus wiring (CAN High/CAN Low) to the seat module.
  • Loose, corroded, or damaged connectors at the seat module or splice points.
  • Blown fuse or lost module power/ground supply.
  • Faulty termination resistor or incorrect bus topology.
  • Module not programmed or incompatible software after replacement.

Symptoms

  • Seat adjustment, heating, ventilation, or memory features do not work or are intermittent.
  • Seat-related warning message or indicator on dash.
  • Multiple related DTCs for seat or network modules.
  • Other modules report errors or reduced functionality that depend on seat module data.

What to check

  • Scan for U0246 plus any related U-codes and view freeze frame/occurrence data.
  • Verify battery voltage with engine off and running (11–14.5 V expected).
  • Inspect fuses and power feeds for the seat control module.
  • Visually inspect connectors and wiring at the seat (look for pin damage, corrosion, or pulled wires).
  • Perform wiggle test on seat harness while monitoring live data/scan tool for communication restoration.
  • Measure CAN bus voltages with a multimeter and/or oscilloscope at the seat module connector and reference module.

Signal parameters

  • CAN bus idle voltages: CAN High ≈ 2.5 V, CAN Low ≈ 2.5 V (recessive); dominant state typically CAN H ≈ 3.5 V, CAN L ≈ 1.5 V (values vary by manufacturer).
  • Expected message interval: periodic seat-module messages typically sent at tens to hundreds of milliseconds (vehicle-specific).
  • Bus data rates commonly 250 kb/s or 500 kb/s depending on network segment.
  • Termination resistance: approx. 60 ohms between CAN H and CAN L when measured at the bus.
  • Supply voltage to module: battery voltage present at module power pin (approx. 11–14.5 V when ignition on).

Diagnostic algorithm

  1. Read and record DTCs, freeze frame data, and module network status with a capable scan tool. Note occurrence history and any related codes.
  2. Clear the code and attempt to reproduce. If the code returns immediately, proceed with wiring and module checks.
  3. Verify module supply and ground: check fuses, measure battery voltage at module power pin, and confirm ground continuity to chassis.
  4. Visually inspect the seat harness, connectors, and grounding points for corrosion, pin damage, or water ingress. Repair as needed.
  5. With ignition on, monitor CAN traffic using a scan tool or CAN bus monitor. Confirm if the seat module is transmitting messages. If no traffic, suspect module or local wiring.
  6. Measure CAN voltages at the seat module connector and at a known-good node. If voltages are out of expected range or one conductor is shorted, isolate and repair wiring.
  7. Check termination resistance across CAN H and CAN L. Remove modules if necessary to isolate the short/incorrect termination.
  8. Perform wiggle tests and repeat monitoring to find intermittent faults. Use an oscilloscope to identify bit errors, dominant bus faults, or reflections if available.
  9. If wiring and power/ground are good and the module does not respond, attempt module software reflash or reprogramming per manufacturer procedures before replacement.
  10. If reprogramming fails or module still does not communicate, replace the seat control module and program/configure it to the vehicle. Re-test the network and functions.
  11. After repair, clear stored codes and confirm absence of U0246 and proper seat operation under varied conditions (ignition cycles, door open/close, seat movement).

Likely causes

  • Damaged connector or wiring to the seat control module (common near seat base).
  • Loss of module power or ground (blown fuse, disconnected connector).
  • CAN bus short to battery or ground on one conductor.
  • Failed seat control module.

Fault status

⚠️ Status
Lost Communication With Seat Control Module E — no or invalid CAN messages received from the seat control module. Indicates the module failed to respond to network requests or periodic broadcasts.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

U0246

HYUNDAI U — Network/User

Lost Communication With “Seat Control Module E”

AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Seat Control Module E failed (internal electronics or software).
  • Open or short in CAN bus wiring (CAN High/CAN Low) to the seat module.
  • Loose, corroded, or damaged connectors at the seat module or splice points.
  • Blown fuse or lost module power/ground supply.
  • Faulty termination resistor or incorrect bus topology.
  • Module not programmed or incompatible software after replacement.

Symptoms

  • Seat adjustment, heating, ventilation, or memory features do not work or are intermittent.
  • Seat-related warning message or indicator on dash.
  • Multiple related DTCs for seat or network modules.
  • Other modules report errors or reduced functionality that depend on seat module data.

What to check

  • Scan for U0246 plus any related U-codes and view freeze frame/occurrence data.
  • Verify battery voltage with engine off and running (11–14.5 V expected).
  • Inspect fuses and power feeds for the seat control module.
  • Visually inspect connectors and wiring at the seat (look for pin damage, corrosion, or pulled wires).
  • Perform wiggle test on seat harness while monitoring live data/scan tool for communication restoration.
  • Measure CAN bus voltages with a multimeter and/or oscilloscope at the seat module connector and reference module.

Signal parameters

  • CAN bus idle voltages: CAN High ≈ 2.5 V, CAN Low ≈ 2.5 V (recessive); dominant state typically CAN H ≈ 3.5 V, CAN L ≈ 1.5 V (values vary by manufacturer).
  • Expected message interval: periodic seat-module messages typically sent at tens to hundreds of milliseconds (vehicle-specific).
  • Bus data rates commonly 250 kb/s or 500 kb/s depending on network segment.
  • Termination resistance: approx. 60 ohms between CAN H and CAN L when measured at the bus.
  • Supply voltage to module: battery voltage present at module power pin (approx. 11–14.5 V when ignition on).

Diagnostic algorithm

  1. Read and record DTCs, freeze frame data, and module network status with a capable scan tool. Note occurrence history and any related codes.
  2. Clear the code and attempt to reproduce. If the code returns immediately, proceed with wiring and module checks.
  3. Verify module supply and ground: check fuses, measure battery voltage at module power pin, and confirm ground continuity to chassis.
  4. Visually inspect the seat harness, connectors, and grounding points for corrosion, pin damage, or water ingress. Repair as needed.
  5. With ignition on, monitor CAN traffic using a scan tool or CAN bus monitor. Confirm if the seat module is transmitting messages. If no traffic, suspect module or local wiring.
  6. Measure CAN voltages at the seat module connector and at a known-good node. If voltages are out of expected range or one conductor is shorted, isolate and repair wiring.
  7. Check termination resistance across CAN H and CAN L. Remove modules if necessary to isolate the short/incorrect termination.
  8. Perform wiggle tests and repeat monitoring to find intermittent faults. Use an oscilloscope to identify bit errors, dominant bus faults, or reflections if available.
  9. If wiring and power/ground are good and the module does not respond, attempt module software reflash or reprogramming per manufacturer procedures before replacement.
  10. If reprogramming fails or module still does not communicate, replace the seat control module and program/configure it to the vehicle. Re-test the network and functions.
  11. After repair, clear stored codes and confirm absence of U0246 and proper seat operation under varied conditions (ignition cycles, door open/close, seat movement).

Likely causes

  • Damaged connector or wiring to the seat control module (common near seat base).
  • Loss of module power or ground (blown fuse, disconnected connector).
  • CAN bus short to battery or ground on one conductor.
  • Failed seat control module.

Fault status

⚠️ Status
Lost Communication With Seat Control Module E — no or invalid CAN messages received from the seat control module. Indicates the module failed to respond to network requests or periodic broadcasts.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

U0246

LAND ROVER U — Network/User

Lost communication with the seat control module E

AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Seat Control Module E failed (internal electronics or software).
  • Open or short in CAN bus wiring (CAN High/CAN Low) to the seat module.
  • Loose, corroded, or damaged connectors at the seat module or splice points.
  • Blown fuse or lost module power/ground supply.
  • Faulty termination resistor or incorrect bus topology.
  • Module not programmed or incompatible software after replacement.

Symptoms

  • Seat adjustment, heating, ventilation, or memory features do not work or are intermittent.
  • Seat-related warning message or indicator on dash.
  • Multiple related DTCs for seat or network modules.
  • Other modules report errors or reduced functionality that depend on seat module data.

What to check

  • Scan for U0246 plus any related U-codes and view freeze frame/occurrence data.
  • Verify battery voltage with engine off and running (11–14.5 V expected).
  • Inspect fuses and power feeds for the seat control module.
  • Visually inspect connectors and wiring at the seat (look for pin damage, corrosion, or pulled wires).
  • Perform wiggle test on seat harness while monitoring live data/scan tool for communication restoration.
  • Measure CAN bus voltages with a multimeter and/or oscilloscope at the seat module connector and reference module.

Signal parameters

  • CAN bus idle voltages: CAN High ≈ 2.5 V, CAN Low ≈ 2.5 V (recessive); dominant state typically CAN H ≈ 3.5 V, CAN L ≈ 1.5 V (values vary by manufacturer).
  • Expected message interval: periodic seat-module messages typically sent at tens to hundreds of milliseconds (vehicle-specific).
  • Bus data rates commonly 250 kb/s or 500 kb/s depending on network segment.
  • Termination resistance: approx. 60 ohms between CAN H and CAN L when measured at the bus.
  • Supply voltage to module: battery voltage present at module power pin (approx. 11–14.5 V when ignition on).

Diagnostic algorithm

  1. Read and record DTCs, freeze frame data, and module network status with a capable scan tool. Note occurrence history and any related codes.
  2. Clear the code and attempt to reproduce. If the code returns immediately, proceed with wiring and module checks.
  3. Verify module supply and ground: check fuses, measure battery voltage at module power pin, and confirm ground continuity to chassis.
  4. Visually inspect the seat harness, connectors, and grounding points for corrosion, pin damage, or water ingress. Repair as needed.
  5. With ignition on, monitor CAN traffic using a scan tool or CAN bus monitor. Confirm if the seat module is transmitting messages. If no traffic, suspect module or local wiring.
  6. Measure CAN voltages at the seat module connector and at a known-good node. If voltages are out of expected range or one conductor is shorted, isolate and repair wiring.
  7. Check termination resistance across CAN H and CAN L. Remove modules if necessary to isolate the short/incorrect termination.
  8. Perform wiggle tests and repeat monitoring to find intermittent faults. Use an oscilloscope to identify bit errors, dominant bus faults, or reflections if available.
  9. If wiring and power/ground are good and the module does not respond, attempt module software reflash or reprogramming per manufacturer procedures before replacement.
  10. If reprogramming fails or module still does not communicate, replace the seat control module and program/configure it to the vehicle. Re-test the network and functions.
  11. After repair, clear stored codes and confirm absence of U0246 and proper seat operation under varied conditions (ignition cycles, door open/close, seat movement).

Likely causes

  • Damaged connector or wiring to the seat control module (common near seat base).
  • Loss of module power or ground (blown fuse, disconnected connector).
  • CAN bus short to battery or ground on one conductor.
  • Failed seat control module.

Fault status

⚠️ Status
Lost Communication With Seat Control Module E — no or invalid CAN messages received from the seat control module. Indicates the module failed to respond to network requests or periodic broadcasts.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

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