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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.

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U0447

Generic U — Network/User

Invalid Data Received From Serial Data Gateway Module A

Brand: Generic
Type: U — Network/User
Views: UK: 24 EN: 92 RU: 32
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
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Code

U0447

HYUNDAI U — Network/User

Invalid Data Received From Gateway “A”

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 16 EN: 48 RU: 19
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
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

U0447

LAND ROVER U — Network/User

Invalid data received from gateway A

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 11 EN: 34 RU: 11
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
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
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  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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