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Home / DTC / U2105 — Invalid CAN bus message received

U2105 — Invalid CAN bus message received

Detailed page for trouble code U2105.

34,405codes
59brands
11,914generic
22,491specific
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Code

U2105

Generic U — Network/User

Invalid CAN bus message received

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

Causes

  • Corrupted or malformed CAN frame data
  • Faulty or misprogrammed control module (ECU) sending invalid messages
  • Damaged wiring or connector causing bit errors
  • Incorrect or missing bus termination (open/incorrect resistor)
  • Bus voltage problems (poor ground, low battery, transients)
  • Electrical interference or noise on the CAN lines

Symptoms

  • Malfunction Indicator Lamp (MIL) or specific communication warning illuminated
  • Intermittent or permanent loss of function for systems that rely on the specific CAN message
  • Diagnostic trouble codes for CAN communication present in one or more modules
  • Vehicles features (displays, instrument cluster, ADAS components) show incorrect or frozen data
  • Increased CAN error frame counts or message retries on a bus monitor

What to check

  • Scan all modules — record additional U-codes and freeze-frame data
  • Inspect wiring harnesses, connectors and ECU pins on the affected network for corrosion, bent pins, or water intrusion
  • Visual check for aftermarket modules or recent repairs on CAN wiring
  • Measure CAN bus termination resistance across CAN_H and CAN_L with power off (should be ~60 Ω across the pair when two 120 Ω terminators present)
  • Monitor battery and chassis ground voltages and verify stable supply while reproducing fault
  • Use a scan tool or CAN bus analyzer to capture faulted messages and timestamped events

Signal parameters

  • CAN message ID (hex)
  • Data Length Code (DLC)
  • CAN payload bytes (0–7) and expected format
  • Checksum/CRC if used by higher-level protocol
  • Timestamp and message frequency (Hz)
  • Bus voltage on CAN_H and CAN_L (idle levels ~2.5 V differential)

Diagnostic algorithm

  1. Record conditions: note when the code sets (key on, driving, temperature, accessory operation). Capture any freeze-frame or logged messages.
  2. Retrieve all communication-related codes from all modules and document; do not assume U2105 is the only issue.
  3. Inspect connectors, wiring and ECUs on the affected CAN network for damage, corrosion, or loose pin(s). Repair any visible faults.
  4. With vehicle power off, measure resistance between CAN_H and CAN_L at a convenient connector; expect ~60 Ω across the pair. If out of range, inspect termination resistors and wiring.
  5. Verify battery and ground integrity; correct any low supply or high-resistance ground issues.
  6. Use a CAN scan tool or oscilloscope to capture the bus during fault conditions. Look for malformed frames, incorrect bit timing, excessive jitter, or noise spikes.
  7. Identify the transmitting node sending the invalid message by correlating message ID and physical wiring or using a protocol analyzer; isolate suspected modules by disconnecting one at a time while monitoring the bus (observe safe isolation procedures and note that some modules may fault when disconnected).
  8. If a specific module is identified, check for available software updates or calibration reflash from the manufacturer before replacing hardware.
  9. Repair or replace damaged wiring, connectors, or the offending module as confirmed by testing. Reinstall correct termination resistors if needed.
  10. Clear codes, perform a full communication re-scan, and road/test while monitoring the CAN bus to confirm the invalid messages do not return.
  11. If intermittent and not reproducible, lengthen data logging time or use event-triggered capture while replicating customer-reported conditions.

Likely causes

  • Intermittent connector or wiring fault on CAN_H or CAN_L
  • One ECU transmitting incorrect message ID or payload due to software/configuration error
  • Missing or incorrect 120 Ω termination resistor or additional termination added
  • Electrical noise from a nearby component (starter, alternator, high-current device)
  • Non‑OEM device or actuator present on the network sending unexpected frames

Fault status

⚠️ Status
An ECU received one or more CAN messages that failed integrity/format validation or did not match expected content; communication on the CAN network may be degraded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

U2105

HUMMER U — Network/User

Invalid data received from another control module

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

Causes

  • Corrupted or malformed CAN frame data
  • Faulty or misprogrammed control module (ECU) sending invalid messages
  • Damaged wiring or connector causing bit errors
  • Incorrect or missing bus termination (open/incorrect resistor)
  • Bus voltage problems (poor ground, low battery, transients)
  • Electrical interference or noise on the CAN lines

Symptoms

  • Malfunction Indicator Lamp (MIL) or specific communication warning illuminated
  • Intermittent or permanent loss of function for systems that rely on the specific CAN message
  • Diagnostic trouble codes for CAN communication present in one or more modules
  • Vehicles features (displays, instrument cluster, ADAS components) show incorrect or frozen data
  • Increased CAN error frame counts or message retries on a bus monitor

What to check

  • Scan all modules — record additional U-codes and freeze-frame data
  • Inspect wiring harnesses, connectors and ECU pins on the affected network for corrosion, bent pins, or water intrusion
  • Visual check for aftermarket modules or recent repairs on CAN wiring
  • Measure CAN bus termination resistance across CAN_H and CAN_L with power off (should be ~60 Ω across the pair when two 120 Ω terminators present)
  • Monitor battery and chassis ground voltages and verify stable supply while reproducing fault
  • Use a scan tool or CAN bus analyzer to capture faulted messages and timestamped events

Signal parameters

  • CAN message ID (hex)
  • Data Length Code (DLC)
  • CAN payload bytes (0–7) and expected format
  • Checksum/CRC if used by higher-level protocol
  • Timestamp and message frequency (Hz)
  • Bus voltage on CAN_H and CAN_L (idle levels ~2.5 V differential)

Diagnostic algorithm

  1. Record conditions: note when the code sets (key on, driving, temperature, accessory operation). Capture any freeze-frame or logged messages.
  2. Retrieve all communication-related codes from all modules and document; do not assume U2105 is the only issue.
  3. Inspect connectors, wiring and ECUs on the affected CAN network for damage, corrosion, or loose pin(s). Repair any visible faults.
  4. With vehicle power off, measure resistance between CAN_H and CAN_L at a convenient connector; expect ~60 Ω across the pair. If out of range, inspect termination resistors and wiring.
  5. Verify battery and ground integrity; correct any low supply or high-resistance ground issues.
  6. Use a CAN scan tool or oscilloscope to capture the bus during fault conditions. Look for malformed frames, incorrect bit timing, excessive jitter, or noise spikes.
  7. Identify the transmitting node sending the invalid message by correlating message ID and physical wiring or using a protocol analyzer; isolate suspected modules by disconnecting one at a time while monitoring the bus (observe safe isolation procedures and note that some modules may fault when disconnected).
  8. If a specific module is identified, check for available software updates or calibration reflash from the manufacturer before replacing hardware.
  9. Repair or replace damaged wiring, connectors, or the offending module as confirmed by testing. Reinstall correct termination resistors if needed.
  10. Clear codes, perform a full communication re-scan, and road/test while monitoring the CAN bus to confirm the invalid messages do not return.
  11. If intermittent and not reproducible, lengthen data logging time or use event-triggered capture while replicating customer-reported conditions.

Likely causes

  • Intermittent connector or wiring fault on CAN_H or CAN_L
  • One ECU transmitting incorrect message ID or payload due to software/configuration error
  • Missing or incorrect 120 Ω termination resistor or additional termination added
  • Electrical noise from a nearby component (starter, alternator, high-current device)
  • Non‑OEM device or actuator present on the network sending unexpected frames

Fault status

⚠️ Status
An ECU received one or more CAN messages that failed integrity/format validation or did not match expected content; communication on the CAN network may be degraded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U2101 U2102 U2103 U2106 U0073 U0100
Repair manuals

Manual library for HUMMER

138

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HUMMER

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Code

U2105

LAND ROVER U — Network/User

Signal of switching package A Signal of the switching package A

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

Causes

  • Corrupted or malformed CAN frame data
  • Faulty or misprogrammed control module (ECU) sending invalid messages
  • Damaged wiring or connector causing bit errors
  • Incorrect or missing bus termination (open/incorrect resistor)
  • Bus voltage problems (poor ground, low battery, transients)
  • Electrical interference or noise on the CAN lines

Symptoms

  • Malfunction Indicator Lamp (MIL) or specific communication warning illuminated
  • Intermittent or permanent loss of function for systems that rely on the specific CAN message
  • Diagnostic trouble codes for CAN communication present in one or more modules
  • Vehicles features (displays, instrument cluster, ADAS components) show incorrect or frozen data
  • Increased CAN error frame counts or message retries on a bus monitor

What to check

  • Scan all modules — record additional U-codes and freeze-frame data
  • Inspect wiring harnesses, connectors and ECU pins on the affected network for corrosion, bent pins, or water intrusion
  • Visual check for aftermarket modules or recent repairs on CAN wiring
  • Measure CAN bus termination resistance across CAN_H and CAN_L with power off (should be ~60 Ω across the pair when two 120 Ω terminators present)
  • Monitor battery and chassis ground voltages and verify stable supply while reproducing fault
  • Use a scan tool or CAN bus analyzer to capture faulted messages and timestamped events

Signal parameters

  • CAN message ID (hex)
  • Data Length Code (DLC)
  • CAN payload bytes (0–7) and expected format
  • Checksum/CRC if used by higher-level protocol
  • Timestamp and message frequency (Hz)
  • Bus voltage on CAN_H and CAN_L (idle levels ~2.5 V differential)

Diagnostic algorithm

  1. Record conditions: note when the code sets (key on, driving, temperature, accessory operation). Capture any freeze-frame or logged messages.
  2. Retrieve all communication-related codes from all modules and document; do not assume U2105 is the only issue.
  3. Inspect connectors, wiring and ECUs on the affected CAN network for damage, corrosion, or loose pin(s). Repair any visible faults.
  4. With vehicle power off, measure resistance between CAN_H and CAN_L at a convenient connector; expect ~60 Ω across the pair. If out of range, inspect termination resistors and wiring.
  5. Verify battery and ground integrity; correct any low supply or high-resistance ground issues.
  6. Use a CAN scan tool or oscilloscope to capture the bus during fault conditions. Look for malformed frames, incorrect bit timing, excessive jitter, or noise spikes.
  7. Identify the transmitting node sending the invalid message by correlating message ID and physical wiring or using a protocol analyzer; isolate suspected modules by disconnecting one at a time while monitoring the bus (observe safe isolation procedures and note that some modules may fault when disconnected).
  8. If a specific module is identified, check for available software updates or calibration reflash from the manufacturer before replacing hardware.
  9. Repair or replace damaged wiring, connectors, or the offending module as confirmed by testing. Reinstall correct termination resistors if needed.
  10. Clear codes, perform a full communication re-scan, and road/test while monitoring the CAN bus to confirm the invalid messages do not return.
  11. If intermittent and not reproducible, lengthen data logging time or use event-triggered capture while replicating customer-reported conditions.

Likely causes

  • Intermittent connector or wiring fault on CAN_H or CAN_L
  • One ECU transmitting incorrect message ID or payload due to software/configuration error
  • Missing or incorrect 120 Ω termination resistor or additional termination added
  • Electrical noise from a nearby component (starter, alternator, high-current device)
  • Non‑OEM device or actuator present on the network sending unexpected frames

Fault status

⚠️ Status
An ECU received one or more CAN messages that failed integrity/format validation or did not match expected content; communication on the CAN network may be degraded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U2101 U2102 U2103 U2106 U0073 U0100
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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Code

U2105

OPEL U — Network/User

CAN-Bus no Communication with ECM (Engine Control Module)

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

Causes

  • Corrupted or malformed CAN frame data
  • Faulty or misprogrammed control module (ECU) sending invalid messages
  • Damaged wiring or connector causing bit errors
  • Incorrect or missing bus termination (open/incorrect resistor)
  • Bus voltage problems (poor ground, low battery, transients)
  • Electrical interference or noise on the CAN lines

Symptoms

  • Malfunction Indicator Lamp (MIL) or specific communication warning illuminated
  • Intermittent or permanent loss of function for systems that rely on the specific CAN message
  • Diagnostic trouble codes for CAN communication present in one or more modules
  • Vehicles features (displays, instrument cluster, ADAS components) show incorrect or frozen data
  • Increased CAN error frame counts or message retries on a bus monitor

What to check

  • Scan all modules — record additional U-codes and freeze-frame data
  • Inspect wiring harnesses, connectors and ECU pins on the affected network for corrosion, bent pins, or water intrusion
  • Visual check for aftermarket modules or recent repairs on CAN wiring
  • Measure CAN bus termination resistance across CAN_H and CAN_L with power off (should be ~60 Ω across the pair when two 120 Ω terminators present)
  • Monitor battery and chassis ground voltages and verify stable supply while reproducing fault
  • Use a scan tool or CAN bus analyzer to capture faulted messages and timestamped events

Signal parameters

  • CAN message ID (hex)
  • Data Length Code (DLC)
  • CAN payload bytes (0–7) and expected format
  • Checksum/CRC if used by higher-level protocol
  • Timestamp and message frequency (Hz)
  • Bus voltage on CAN_H and CAN_L (idle levels ~2.5 V differential)

Diagnostic algorithm

  1. Record conditions: note when the code sets (key on, driving, temperature, accessory operation). Capture any freeze-frame or logged messages.
  2. Retrieve all communication-related codes from all modules and document; do not assume U2105 is the only issue.
  3. Inspect connectors, wiring and ECUs on the affected CAN network for damage, corrosion, or loose pin(s). Repair any visible faults.
  4. With vehicle power off, measure resistance between CAN_H and CAN_L at a convenient connector; expect ~60 Ω across the pair. If out of range, inspect termination resistors and wiring.
  5. Verify battery and ground integrity; correct any low supply or high-resistance ground issues.
  6. Use a CAN scan tool or oscilloscope to capture the bus during fault conditions. Look for malformed frames, incorrect bit timing, excessive jitter, or noise spikes.
  7. Identify the transmitting node sending the invalid message by correlating message ID and physical wiring or using a protocol analyzer; isolate suspected modules by disconnecting one at a time while monitoring the bus (observe safe isolation procedures and note that some modules may fault when disconnected).
  8. If a specific module is identified, check for available software updates or calibration reflash from the manufacturer before replacing hardware.
  9. Repair or replace damaged wiring, connectors, or the offending module as confirmed by testing. Reinstall correct termination resistors if needed.
  10. Clear codes, perform a full communication re-scan, and road/test while monitoring the CAN bus to confirm the invalid messages do not return.
  11. If intermittent and not reproducible, lengthen data logging time or use event-triggered capture while replicating customer-reported conditions.

Likely causes

  • Intermittent connector or wiring fault on CAN_H or CAN_L
  • One ECU transmitting incorrect message ID or payload due to software/configuration error
  • Missing or incorrect 120 Ω termination resistor or additional termination added
  • Electrical noise from a nearby component (starter, alternator, high-current device)
  • Non‑OEM device or actuator present on the network sending unexpected frames

Fault status

⚠️ Status
An ECU received one or more CAN messages that failed integrity/format validation or did not match expected content; communication on the CAN network may be degraded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U2101 U2102 U2103 U2106 U0073 U0100
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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