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Home / DTC / U0447 — Invalid Data Received From Serial Data Gateway Module A

U0447 — Invalid Data Received From Serial Data Gateway Module A

Detailed page for trouble code U0447.

34,356codes
59brands
11,865generic
22,491specific
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Code

U0447

Generic U — Network/User

Invalid Data Received From Serial Data Gateway Module A

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

Causes

  • Faulty Serial Data Gateway Module A (hardware or firmware)
  • Open, short or high-resistance wiring on CAN/serial network (including connectors)
  • Poor power or ground to the gateway or other network nodes
  • Missing or corrupted message IDs or data (software mismatch or module configured incorrectly)
  • Bus termination incorrect or missing (improper 120Ω resistors / 60Ω total)
  • Intermittent connection (corrosion, water intrusion, damaged pins)

Symptoms

  • Malfunction Indicator Lamp (MIL) or amber/network warning illuminated
  • Loss or intermittent operation of features that rely on gateway messages (instrument cluster, HVAC, telematics, ABS, traction control, door locks)
  • Erratic or frozen gauges, blank displays, or wrong instrument readings
  • Multiple network communication DTCs present
  • No-crank or no-start if engine control messages are blocked

What to check

  • Read all stored and pending U-codes and related freeze-frame data with a capable scan tool
  • Check for other modules reporting communication faults (scan tool network/module list)
  • Verify battery voltage and charge status (while cranking and at idle)
  • Visually inspect gateway connectors and harness for corrosion, damaged pins, water intrusion, or repair patches
  • Verify power and ground at the gateway pin terminals (power present with key on, good ground continuity to chassis)
  • Measure CAN bus voltages at the gateway: CAN_H and CAN_L resting voltages and differential voltage

Signal parameters

  • Nominal CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each), differential ≈ 0 V at idle; when active differential ≈ ±2 V
  • Typical CAN differential peak ≈ 2.0 V (depending on vehicle network), baud rates commonly 250 kbps or 500 kbps (verify OEM)
  • Termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H and CAN_L
  • Expected battery voltage during tests: 11–16 V (engine off/cranking/charging conditions vary)
  • Ground resistance: chassis ground to module

Diagnostic algorithm

  1. Retrieve and record all U-codes and related active/inactive events with a capable scan tool. Note freeze frame and affected modules.
  2. Check vehicle battery state and verify stable supply voltage. Recharge or replace if low. Re-check codes after stable power.
  3. Inspect connector(s) and wiring to Serial Data Gateway Module A for corrosion, loose pins, water intrusion, or damage. Repair or clean as required.
  4. Verify power and ground at the gateway connector with key on; repair any open/fused feeds or poor ground connections.
  5. With ignition on, use a scan tool to confirm the gateway module and other network nodes appear on the bus. Identify missing nodes.
  6. Measure CAN_H and CAN_L voltages at the gateway and another known-good node. Confirm termination resistance ≈60 Ω. Look for shorts to battery/ground.

Likely causes

  • Loose/dirty connector or poor ground at the gateway
  • CAN high/low short to power or ground at or near the gateway
  • Missing supply voltage to the gateway (fused ignition or battery feed)
  • Network termination missing or damaged
  • Gateway software version incompatible after module replacement or update

Fault status

⚠️ Status
Invalid data received from Serial Data Gateway Module A — network messages are corrupted, missing, or unexpected; communication fault logged and MIL may be illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

U0447

HYUNDAI U — Network/User

Invalid Data Received From Gateway “A”

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

Causes

  • Faulty Serial Data Gateway Module A (hardware or firmware)
  • Open, short or high-resistance wiring on CAN/serial network (including connectors)
  • Poor power or ground to the gateway or other network nodes
  • Missing or corrupted message IDs or data (software mismatch or module configured incorrectly)
  • Bus termination incorrect or missing (improper 120Ω resistors / 60Ω total)
  • Intermittent connection (corrosion, water intrusion, damaged pins)

Symptoms

  • Malfunction Indicator Lamp (MIL) or amber/network warning illuminated
  • Loss or intermittent operation of features that rely on gateway messages (instrument cluster, HVAC, telematics, ABS, traction control, door locks)
  • Erratic or frozen gauges, blank displays, or wrong instrument readings
  • Multiple network communication DTCs present
  • No-crank or no-start if engine control messages are blocked

What to check

  • Read all stored and pending U-codes and related freeze-frame data with a capable scan tool
  • Check for other modules reporting communication faults (scan tool network/module list)
  • Verify battery voltage and charge status (while cranking and at idle)
  • Visually inspect gateway connectors and harness for corrosion, damaged pins, water intrusion, or repair patches
  • Verify power and ground at the gateway pin terminals (power present with key on, good ground continuity to chassis)
  • Measure CAN bus voltages at the gateway: CAN_H and CAN_L resting voltages and differential voltage

Signal parameters

  • Nominal CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each), differential ≈ 0 V at idle; when active differential ≈ ±2 V
  • Typical CAN differential peak ≈ 2.0 V (depending on vehicle network), baud rates commonly 250 kbps or 500 kbps (verify OEM)
  • Termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H and CAN_L
  • Expected battery voltage during tests: 11–16 V (engine off/cranking/charging conditions vary)
  • Ground resistance: chassis ground to module

Diagnostic algorithm

  1. Retrieve and record all U-codes and related active/inactive events with a capable scan tool. Note freeze frame and affected modules.
  2. Check vehicle battery state and verify stable supply voltage. Recharge or replace if low. Re-check codes after stable power.
  3. Inspect connector(s) and wiring to Serial Data Gateway Module A for corrosion, loose pins, water intrusion, or damage. Repair or clean as required.
  4. Verify power and ground at the gateway connector with key on; repair any open/fused feeds or poor ground connections.
  5. With ignition on, use a scan tool to confirm the gateway module and other network nodes appear on the bus. Identify missing nodes.
  6. Measure CAN_H and CAN_L voltages at the gateway and another known-good node. Confirm termination resistance ≈60 Ω. Look for shorts to battery/ground.

Likely causes

  • Loose/dirty connector or poor ground at the gateway
  • CAN high/low short to power or ground at or near the gateway
  • Missing supply voltage to the gateway (fused ignition or battery feed)
  • Network termination missing or damaged
  • Gateway software version incompatible after module replacement or update

Fault status

⚠️ Status
Invalid data received from Serial Data Gateway Module A — network messages are corrupted, missing, or unexpected; communication fault logged and MIL may be illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0073 U0415 U0401 U0144 U0422
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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Code

U0447

LAND ROVER U — Network/User

Invalid data received from gateway A

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

Causes

  • Faulty Serial Data Gateway Module A (hardware or firmware)
  • Open, short or high-resistance wiring on CAN/serial network (including connectors)
  • Poor power or ground to the gateway or other network nodes
  • Missing or corrupted message IDs or data (software mismatch or module configured incorrectly)
  • Bus termination incorrect or missing (improper 120Ω resistors / 60Ω total)
  • Intermittent connection (corrosion, water intrusion, damaged pins)

Symptoms

  • Malfunction Indicator Lamp (MIL) or amber/network warning illuminated
  • Loss or intermittent operation of features that rely on gateway messages (instrument cluster, HVAC, telematics, ABS, traction control, door locks)
  • Erratic or frozen gauges, blank displays, or wrong instrument readings
  • Multiple network communication DTCs present
  • No-crank or no-start if engine control messages are blocked

What to check

  • Read all stored and pending U-codes and related freeze-frame data with a capable scan tool
  • Check for other modules reporting communication faults (scan tool network/module list)
  • Verify battery voltage and charge status (while cranking and at idle)
  • Visually inspect gateway connectors and harness for corrosion, damaged pins, water intrusion, or repair patches
  • Verify power and ground at the gateway pin terminals (power present with key on, good ground continuity to chassis)
  • Measure CAN bus voltages at the gateway: CAN_H and CAN_L resting voltages and differential voltage

Signal parameters

  • Nominal CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each), differential ≈ 0 V at idle; when active differential ≈ ±2 V
  • Typical CAN differential peak ≈ 2.0 V (depending on vehicle network), baud rates commonly 250 kbps or 500 kbps (verify OEM)
  • Termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H and CAN_L
  • Expected battery voltage during tests: 11–16 V (engine off/cranking/charging conditions vary)
  • Ground resistance: chassis ground to module

Diagnostic algorithm

  1. Retrieve and record all U-codes and related active/inactive events with a capable scan tool. Note freeze frame and affected modules.
  2. Check vehicle battery state and verify stable supply voltage. Recharge or replace if low. Re-check codes after stable power.
  3. Inspect connector(s) and wiring to Serial Data Gateway Module A for corrosion, loose pins, water intrusion, or damage. Repair or clean as required.
  4. Verify power and ground at the gateway connector with key on; repair any open/fused feeds or poor ground connections.
  5. With ignition on, use a scan tool to confirm the gateway module and other network nodes appear on the bus. Identify missing nodes.
  6. Measure CAN_H and CAN_L voltages at the gateway and another known-good node. Confirm termination resistance ≈60 Ω. Look for shorts to battery/ground.

Likely causes

  • Loose/dirty connector or poor ground at the gateway
  • CAN high/low short to power or ground at or near the gateway
  • Missing supply voltage to the gateway (fused ignition or battery feed)
  • Network termination missing or damaged
  • Gateway software version incompatible after module replacement or update

Fault status

⚠️ Status
Invalid data received from Serial Data Gateway Module A — network messages are corrupted, missing, or unexpected; communication fault logged and MIL may be illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0073 U0415 U0401 U0144 U0422
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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