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Home / DTC / U0250 — Lost Communication With Impact Classification System Module

U0250 — Lost Communication With Impact Classification System Module

Detailed page for trouble code U0250.

34,337codes
59brands
11,846generic
22,491specific
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Code

U0250

Generic U — Network/User

Lost Communication With Impact Classification System Module

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

Causes

  • Blown fuse or loss of module power/ground
  • Damaged, corroded, or disconnected wiring/connectors to the ICS module
  • CAN bus short, open, or high-resistance connection (CAN‑H/CAN‑L)
  • Module is asleep, disabled, or not programmed/configured correctly
  • Aftermarket device or recent repair altered network wiring or termination
  • Internal module failure

Symptoms

  • SRS/Airbag warning lamp illuminated or stored airbag-related DTCs
  • Impact classification functions unavailable; related features may be disabled or degraded
  • Other modules report loss-of-communication DTCs or reduced functionality
  • Vehicle diagnostic scan shows U0250 and possibly related network U-codes
  • Intermittent or permanent inability to read ICS live data with a scan tool

What to check

  • Connect an OBD-II scan tool and read all modules and freeze-frame data; note other network codes
  • Check battery voltage and charging system; low voltage can cause comms faults
  • Visually inspect ICS module connector(s) for corrosion, bent pins, or water damage
  • Verify fuses and power/ground circuits to the ICS module are intact
  • Scan for other U-codes that indicate gateway or CAN bus issues
  • Perform a wiggle test while monitoring bus messages to detect intermittent wiring faults

Signal parameters

  • CAN bus idle (recessive) voltages: CAN‑H ≈ 2.5 V, CAN‑L ≈ 2.5 V (differential ~0 V); dominant state typically ≈ CAN‑H 3.5 V / CAN‑L 1.5 V (differential ~2.0 V)
  • Expected bus termination resistance: ~60 ohms (two 120 Ω terminators in parallel; acceptable ~50–70 Ω)
  • Typical ICS message interval: periodic broadcast messages on the airbag/CAN network often in the 10–200 ms range (vehicle specific)
  • Response time to diagnostic request: module should respond within tens to a few hundred milliseconds when present and awake

Diagnostic algorithm

  1. Record all stored codes and freeze-frame data from all modules; note timestamps and related network codes.
  2. Verify battery voltage (12.4–12.8 V engine off, >13.5 V charging with engine running) and good ground connections.
  3. Inspect fuses and relays feeding the ICS module; verify terminal power with key ON and key OFF as required by wiring diagram.
  4. Visually inspect the ICS connector and harness for damage, corrosion, or moisture; repair or reseal as needed.
  5. With a scan tool connected, monitor CAN bus traffic. If no ICS messages appear, suspect power/wiring or module failure.
  6. Measure CAN‑H and CAN‑L voltages at the ICS connector with ignition ON; compare to expected values and to a known-good point on the same bus.

Likely causes

  • No supply voltage or missing ground at ICS module connector
  • Broken CAN bus conductor or chafed harness between module and gateway/ECU
  • Poor termination or incorrect bus resistance (open or shorted terminators)
  • Connector corrosion or bent pins preventing comms
  • Module software mismatch after replacement or update not completed
  • Faulty gateway or intermediate module preventing packet routing

Fault status

⚠️ Status
Lost communication with Impact Classification System module — ICS not responding on the vehicle network. Check power/ground, wiring/connectors, CAN bus integrity, module presence and programming.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

U0250

HYUNDAI U — Network/User

Lost Communication With Impact Classification System Module

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

Causes

  • Blown fuse or loss of module power/ground
  • Damaged, corroded, or disconnected wiring/connectors to the ICS module
  • CAN bus short, open, or high-resistance connection (CAN‑H/CAN‑L)
  • Module is asleep, disabled, or not programmed/configured correctly
  • Aftermarket device or recent repair altered network wiring or termination
  • Internal module failure

Symptoms

  • SRS/Airbag warning lamp illuminated or stored airbag-related DTCs
  • Impact classification functions unavailable; related features may be disabled or degraded
  • Other modules report loss-of-communication DTCs or reduced functionality
  • Vehicle diagnostic scan shows U0250 and possibly related network U-codes
  • Intermittent or permanent inability to read ICS live data with a scan tool

What to check

  • Connect an OBD-II scan tool and read all modules and freeze-frame data; note other network codes
  • Check battery voltage and charging system; low voltage can cause comms faults
  • Visually inspect ICS module connector(s) for corrosion, bent pins, or water damage
  • Verify fuses and power/ground circuits to the ICS module are intact
  • Scan for other U-codes that indicate gateway or CAN bus issues
  • Perform a wiggle test while monitoring bus messages to detect intermittent wiring faults

Signal parameters

  • CAN bus idle (recessive) voltages: CAN‑H ≈ 2.5 V, CAN‑L ≈ 2.5 V (differential ~0 V); dominant state typically ≈ CAN‑H 3.5 V / CAN‑L 1.5 V (differential ~2.0 V)
  • Expected bus termination resistance: ~60 ohms (two 120 Ω terminators in parallel; acceptable ~50–70 Ω)
  • Typical ICS message interval: periodic broadcast messages on the airbag/CAN network often in the 10–200 ms range (vehicle specific)
  • Response time to diagnostic request: module should respond within tens to a few hundred milliseconds when present and awake

Diagnostic algorithm

  1. Record all stored codes and freeze-frame data from all modules; note timestamps and related network codes.
  2. Verify battery voltage (12.4–12.8 V engine off, >13.5 V charging with engine running) and good ground connections.
  3. Inspect fuses and relays feeding the ICS module; verify terminal power with key ON and key OFF as required by wiring diagram.
  4. Visually inspect the ICS connector and harness for damage, corrosion, or moisture; repair or reseal as needed.
  5. With a scan tool connected, monitor CAN bus traffic. If no ICS messages appear, suspect power/wiring or module failure.
  6. Measure CAN‑H and CAN‑L voltages at the ICS connector with ignition ON; compare to expected values and to a known-good point on the same bus.

Likely causes

  • No supply voltage or missing ground at ICS module connector
  • Broken CAN bus conductor or chafed harness between module and gateway/ECU
  • Poor termination or incorrect bus resistance (open or shorted terminators)
  • Connector corrosion or bent pins preventing comms
  • Module software mismatch after replacement or update not completed
  • Faulty gateway or intermediate module preventing packet routing

Fault status

⚠️ Status
Lost communication with Impact Classification System module — ICS not responding on the vehicle network. Check power/ground, wiring/connectors, CAN bus integrity, module presence and programming.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0400
371

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

HYUNDAI

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Code

U0250

LAND ROVER U — Network/User

Lost communication with the classification system module impact

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

Causes

  • Blown fuse or loss of module power/ground
  • Damaged, corroded, or disconnected wiring/connectors to the ICS module
  • CAN bus short, open, or high-resistance connection (CAN‑H/CAN‑L)
  • Module is asleep, disabled, or not programmed/configured correctly
  • Aftermarket device or recent repair altered network wiring or termination
  • Internal module failure

Symptoms

  • SRS/Airbag warning lamp illuminated or stored airbag-related DTCs
  • Impact classification functions unavailable; related features may be disabled or degraded
  • Other modules report loss-of-communication DTCs or reduced functionality
  • Vehicle diagnostic scan shows U0250 and possibly related network U-codes
  • Intermittent or permanent inability to read ICS live data with a scan tool

What to check

  • Connect an OBD-II scan tool and read all modules and freeze-frame data; note other network codes
  • Check battery voltage and charging system; low voltage can cause comms faults
  • Visually inspect ICS module connector(s) for corrosion, bent pins, or water damage
  • Verify fuses and power/ground circuits to the ICS module are intact
  • Scan for other U-codes that indicate gateway or CAN bus issues
  • Perform a wiggle test while monitoring bus messages to detect intermittent wiring faults

Signal parameters

  • CAN bus idle (recessive) voltages: CAN‑H ≈ 2.5 V, CAN‑L ≈ 2.5 V (differential ~0 V); dominant state typically ≈ CAN‑H 3.5 V / CAN‑L 1.5 V (differential ~2.0 V)
  • Expected bus termination resistance: ~60 ohms (two 120 Ω terminators in parallel; acceptable ~50–70 Ω)
  • Typical ICS message interval: periodic broadcast messages on the airbag/CAN network often in the 10–200 ms range (vehicle specific)
  • Response time to diagnostic request: module should respond within tens to a few hundred milliseconds when present and awake

Diagnostic algorithm

  1. Record all stored codes and freeze-frame data from all modules; note timestamps and related network codes.
  2. Verify battery voltage (12.4–12.8 V engine off, >13.5 V charging with engine running) and good ground connections.
  3. Inspect fuses and relays feeding the ICS module; verify terminal power with key ON and key OFF as required by wiring diagram.
  4. Visually inspect the ICS connector and harness for damage, corrosion, or moisture; repair or reseal as needed.
  5. With a scan tool connected, monitor CAN bus traffic. If no ICS messages appear, suspect power/wiring or module failure.
  6. Measure CAN‑H and CAN‑L voltages at the ICS connector with ignition ON; compare to expected values and to a known-good point on the same bus.

Likely causes

  • No supply voltage or missing ground at ICS module connector
  • Broken CAN bus conductor or chafed harness between module and gateway/ECU
  • Poor termination or incorrect bus resistance (open or shorted terminators)
  • Connector corrosion or bent pins preventing comms
  • Module software mismatch after replacement or update not completed
  • Faulty gateway or intermediate module preventing packet routing

Fault status

⚠️ Status
Lost communication with Impact Classification System module — ICS not responding on the vehicle network. Check power/ground, wiring/connectors, CAN bus integrity, module presence and programming.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0400
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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