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Home / DTC / U0156 — Lost Communication With Information Center A

U0156 — Lost Communication With Information Center A

Detailed page for trouble code U0156.

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U0156

Generic U — Network/User

Lost Communication With Information Center A

Brand: Generic
Type: U — Network/User
Views: UK: 32 EN: 27 RU: 31
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Information Center A module (ICM)
  • Open or shorted CAN bus wiring (CAN High/CAN Low)
  • Missing or poor power or ground to the Information Center A module
  • Blown fuse or fusible link supplying the module or CAN transceiver
  • Bad or corroded connector pins at the module or splice
  • Faulty termination resistor(s) on the CAN bus

Symptoms

  • Information Center/display inoperative or blank
  • Inaccurate or missing instrument/infotainment data
  • Multiple modules reporting lost communication or network errors
  • Warning messages or lamp(s) related to communication failures
  • Features controlled by the information center do not respond

What to check

  • Read freeze frame and full DTC list from all modules with a capable scan tool
  • Verify vehicle battery voltage (should be within spec) and check for starter/charging issues
  • Inspect fuses and relays for the Information Center and network power
  • Visually inspect connectors and wiring at the Information Center A module for damage or corrosion
  • Measure resistance between CAN High and CAN Low at multiple locations (expected ~60 ohms with both terminations)
  • Probe CAN High and CAN Low with a scope or lab meter while key ON to confirm activity

Signal parameters

  • CAN recessive idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each referenced to battery ground)
  • CAN dominant voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (during dominant bits)
  • Expected differential at idle ≈ 0 V; during data transitions differential typically ≈ ±2 V
  • Typical CAN bus termination: two 120 Ω resistors in parallel = ~60 Ω between CAN_H and CAN_L
  • Common data rates: 125 kb/s, 250 kb/s, 500 kb/s — verify vehicle-specific rate with scan tool

Diagnostic algorithm

  1. Retrieve all U-codes and related CAN network codes from all modules; note occurrence conditions and freeze frame.
  2. Verify battery voltage and perform key cycle or ignition on/off to see if communication returns.
  3. Check fuses and power/ground at the Information Center A module; repair any open circuits.
  4. Perform a visual inspection of harness, connectors and pins at the module and at common splice points.
  5. Measure CAN_H to CAN_L resistance at the module connector with ignition off; expect ~60 Ω. If open or very low, trace wiring for opens/shorts.
  6. With a scope or CAN capable scan tool, monitor CAN_H and CAN_L for valid frames while other modules communicate. Look for noise, constant dominant level, or missing traffic.
  7. If bus is valid but the Information Center does not respond, check module presence with scan tool (addressed). If module is not present and power/ground are good, consider module replacement or reprogramming.
  8. To isolate bus faults, disconnect other non-essential modules one at a time (with ignition off per manufacturer procedure) and re-test.
  9. After repair or module replacement, clear codes and verify the code does not return under the same operating conditions; perform any required reprogramming or module alignment.

Likely causes

  • Damaged or disconnected CAN High/CAN Low wiring to Information Center A
  • No power or poor ground to the Information Center A module
  • Failed CAN transceiver inside the module
  • Open or missing bus termination (approx. 60 ohms total)
  • Intermittent connector contact or corrosion at the module harness

Fault status

⚠️ Status
Lost Communication With Information Center A — messages from the Information Center A are not being received on the vehicle network (CAN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
Workshop Manuals

Available brands with manuals

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Code

U0156

HYUNDAI U — Network/User

Lost Communication With Information Center “A”

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 20 EN: 23 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Information Center A module (ICM)
  • Open or shorted CAN bus wiring (CAN High/CAN Low)
  • Missing or poor power or ground to the Information Center A module
  • Blown fuse or fusible link supplying the module or CAN transceiver
  • Bad or corroded connector pins at the module or splice
  • Faulty termination resistor(s) on the CAN bus

Symptoms

  • Information Center/display inoperative or blank
  • Inaccurate or missing instrument/infotainment data
  • Multiple modules reporting lost communication or network errors
  • Warning messages or lamp(s) related to communication failures
  • Features controlled by the information center do not respond

What to check

  • Read freeze frame and full DTC list from all modules with a capable scan tool
  • Verify vehicle battery voltage (should be within spec) and check for starter/charging issues
  • Inspect fuses and relays for the Information Center and network power
  • Visually inspect connectors and wiring at the Information Center A module for damage or corrosion
  • Measure resistance between CAN High and CAN Low at multiple locations (expected ~60 ohms with both terminations)
  • Probe CAN High and CAN Low with a scope or lab meter while key ON to confirm activity

Signal parameters

  • CAN recessive idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each referenced to battery ground)
  • CAN dominant voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (during dominant bits)
  • Expected differential at idle ≈ 0 V; during data transitions differential typically ≈ ±2 V
  • Typical CAN bus termination: two 120 Ω resistors in parallel = ~60 Ω between CAN_H and CAN_L
  • Common data rates: 125 kb/s, 250 kb/s, 500 kb/s — verify vehicle-specific rate with scan tool

Diagnostic algorithm

  1. Retrieve all U-codes and related CAN network codes from all modules; note occurrence conditions and freeze frame.
  2. Verify battery voltage and perform key cycle or ignition on/off to see if communication returns.
  3. Check fuses and power/ground at the Information Center A module; repair any open circuits.
  4. Perform a visual inspection of harness, connectors and pins at the module and at common splice points.
  5. Measure CAN_H to CAN_L resistance at the module connector with ignition off; expect ~60 Ω. If open or very low, trace wiring for opens/shorts.
  6. With a scope or CAN capable scan tool, monitor CAN_H and CAN_L for valid frames while other modules communicate. Look for noise, constant dominant level, or missing traffic.
  7. If bus is valid but the Information Center does not respond, check module presence with scan tool (addressed). If module is not present and power/ground are good, consider module replacement or reprogramming.
  8. To isolate bus faults, disconnect other non-essential modules one at a time (with ignition off per manufacturer procedure) and re-test.
  9. After repair or module replacement, clear codes and verify the code does not return under the same operating conditions; perform any required reprogramming or module alignment.

Likely causes

  • Damaged or disconnected CAN High/CAN Low wiring to Information Center A
  • No power or poor ground to the Information Center A module
  • Failed CAN transceiver inside the module
  • Open or missing bus termination (approx. 60 ohms total)
  • Intermittent connector contact or corrosion at the module harness

Fault status

⚠️ Status
Lost Communication With Information Center A — messages from the Information Center A are not being received on the vehicle network (CAN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
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Code

U0156

LAND ROVER U — Network/User

Lost communication with the information center A

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 11 EN: 14 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Information Center A module (ICM)
  • Open or shorted CAN bus wiring (CAN High/CAN Low)
  • Missing or poor power or ground to the Information Center A module
  • Blown fuse or fusible link supplying the module or CAN transceiver
  • Bad or corroded connector pins at the module or splice
  • Faulty termination resistor(s) on the CAN bus

Symptoms

  • Information Center/display inoperative or blank
  • Inaccurate or missing instrument/infotainment data
  • Multiple modules reporting lost communication or network errors
  • Warning messages or lamp(s) related to communication failures
  • Features controlled by the information center do not respond

What to check

  • Read freeze frame and full DTC list from all modules with a capable scan tool
  • Verify vehicle battery voltage (should be within spec) and check for starter/charging issues
  • Inspect fuses and relays for the Information Center and network power
  • Visually inspect connectors and wiring at the Information Center A module for damage or corrosion
  • Measure resistance between CAN High and CAN Low at multiple locations (expected ~60 ohms with both terminations)
  • Probe CAN High and CAN Low with a scope or lab meter while key ON to confirm activity

Signal parameters

  • CAN recessive idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each referenced to battery ground)
  • CAN dominant voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (during dominant bits)
  • Expected differential at idle ≈ 0 V; during data transitions differential typically ≈ ±2 V
  • Typical CAN bus termination: two 120 Ω resistors in parallel = ~60 Ω between CAN_H and CAN_L
  • Common data rates: 125 kb/s, 250 kb/s, 500 kb/s — verify vehicle-specific rate with scan tool

Diagnostic algorithm

  1. Retrieve all U-codes and related CAN network codes from all modules; note occurrence conditions and freeze frame.
  2. Verify battery voltage and perform key cycle or ignition on/off to see if communication returns.
  3. Check fuses and power/ground at the Information Center A module; repair any open circuits.
  4. Perform a visual inspection of harness, connectors and pins at the module and at common splice points.
  5. Measure CAN_H to CAN_L resistance at the module connector with ignition off; expect ~60 Ω. If open or very low, trace wiring for opens/shorts.
  6. With a scope or CAN capable scan tool, monitor CAN_H and CAN_L for valid frames while other modules communicate. Look for noise, constant dominant level, or missing traffic.
  7. If bus is valid but the Information Center does not respond, check module presence with scan tool (addressed). If module is not present and power/ground are good, consider module replacement or reprogramming.
  8. To isolate bus faults, disconnect other non-essential modules one at a time (with ignition off per manufacturer procedure) and re-test.
  9. After repair or module replacement, clear codes and verify the code does not return under the same operating conditions; perform any required reprogramming or module alignment.

Likely causes

  • Damaged or disconnected CAN High/CAN Low wiring to Information Center A
  • No power or poor ground to the Information Center A module
  • Failed CAN transceiver inside the module
  • Open or missing bus termination (approx. 60 ohms total)
  • Intermittent connector contact or corrosion at the module harness

Fault status

⚠️ Status
Lost Communication With Information Center A — messages from the Information Center A are not being received on the vehicle network (CAN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
Workshop Manuals

Repair manuals for LAND ROVER

3

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
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
Buy

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
Buy

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
Buy
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+100 karma for a short comment :)
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