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Home / DTC / U2106 — Invalid Data Received From Telematics Control Unit

U2106 — Invalid Data Received From Telematics Control Unit

Detailed page for trouble code U2106.

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

U2106

HUMMER U — Network/User

Invalid Data Received From Telematics Control Unit

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

Causes

  • Faulty Telematics Control Unit (hardware or firmware)
  • Intermittent or lost power / ground to the TCU
  • Damaged, corroded, or loose connectors/wiring on the TCU harness
  • Physical layer fault on the vehicle data bus (CAN/LIN/ethernet)
  • Software/calibration mismatch after module replacement or update
  • Another module sending malformed messages or bus contention

Symptoms

  • Telematics features not working (e.g., remote services, emergency call)
  • Other modules report communication warnings or store related U-codes
  • Diagnostic tool shows invalid or missing TCU messages
  • Occasional or persistent warning lights related to networked systems
  • DTC U2106 present in scan tool with stored freeze frame

What to check

  • Read all stored and pending codes from all modules; note freeze frame and timestamps
  • Check for other U-codes that identify a broader network issue (gateway, CAN bus off)
  • Visually inspect TCU connector and wiring for corrosion, water, pin damage, bent pins
  • Verify vehicle battery voltage during key-on and while attempting communication (11–14 V)
  • Check and verify TCU ground(s) are clean, tight, and low resistance to chassis
  • Measure CAN/LIN physical layer (voltages, continuity and bus resistance)

Signal parameters

  • TCU supply voltage (key ON): ~11–14 V (should be stable during communications)
  • TCU ground continuity: near 0 ohms to chassis
  • CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.0–2.0 V; differential ≈ 2.0 V
  • Bus termination resistance (across CAN_H and CAN_L at vehicle off): ≈ 60 ohms (two 120Ω in parallel)
  • Expected TCU message cadence: manufacturer-specific periodic messages (often 1 Hz to several Hz); absence or irregular timing may indicate fault
  • Message payload: values should be within expected ranges for telematics data (check vehicle-specific definitions with OEM tool)

Diagnostic algorithm

  1. Confirm the DTC: connect OEM-level scan tool, retrieve U2106 and related codes, record freeze frame and event counter.
  2. Check for patterns: note if code is continuous or intermittent, and whether it appears after specific events (start, driving, after module wake).
  3. Inspect harness and connectors: unclip TCU connector(s), check pins for corrosion, bent pins, water intrusion, and proper mating.
  4. Verify power & ground: back-probe TCU power and ground pins while operating to confirm stable supply and good ground.
  5. Test physical layer: with meter/ohmmeter check CAN pair continuity and measure termination resistance (~60Ω). If available, use an oscilloscope to observe CAN_H/CAN_L idle and differential waveforms and look for noise or missing dominant/recessive states.
  6. Monitor network traffic: use OEM scan tool or CAN bus analyzer to observe TCU message IDs, frequency, and payload. Compare against manufacturer expected patterns; look for malformed frames or CRC errors if supported.
  7. Wiggle and re-test: with connector mated, wiggle harnesses and connectors to check for intermittent faults while monitoring codes and messages.
  8. Software and configuration: verify TCU calibration/firmware level. Reflash or update TCU software if an update or known fix exists. Ensure any replaced module is properly programmed and security-enabled.
  9. Isolate the fault: if possible, disconnect suspect downstream modules one at a time to determine if another module is corrupting the bus. Replace or repair wiring/components only after confirming physical-layer integrity.
  10. Replace TCU only after confirming wiring, power/ground, and bus integrity. After replacement, program/configure the new TCU per OEM procedures and recheck for recurrence.

Likely causes

  • Corroded connector at TCU or ground strap causing intermittent data errors
  • Failed TCU after water intrusion or impact
  • Broken or shorted CAN/LIN pair between TCU and gateway/module
  • Unprogrammed/reprogrammed replacement TCU with incompatible calibration
  • Bus termination resistor open or high resistance causing reflections

Fault status

⚠️ Status
Invalid data received from Telematics Control Unit — communications show corrupted, missing, or out-of-range messages from the TCU.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0073 U0100 U0121 U0140 U2100 U2101
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

U2106

LAND ROVER U — Network/User

Signal of the package switching B

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

Causes

  • Faulty Telematics Control Unit (hardware or firmware)
  • Intermittent or lost power / ground to the TCU
  • Damaged, corroded, or loose connectors/wiring on the TCU harness
  • Physical layer fault on the vehicle data bus (CAN/LIN/ethernet)
  • Software/calibration mismatch after module replacement or update
  • Another module sending malformed messages or bus contention

Symptoms

  • Telematics features not working (e.g., remote services, emergency call)
  • Other modules report communication warnings or store related U-codes
  • Diagnostic tool shows invalid or missing TCU messages
  • Occasional or persistent warning lights related to networked systems
  • DTC U2106 present in scan tool with stored freeze frame

What to check

  • Read all stored and pending codes from all modules; note freeze frame and timestamps
  • Check for other U-codes that identify a broader network issue (gateway, CAN bus off)
  • Visually inspect TCU connector and wiring for corrosion, water, pin damage, bent pins
  • Verify vehicle battery voltage during key-on and while attempting communication (11–14 V)
  • Check and verify TCU ground(s) are clean, tight, and low resistance to chassis
  • Measure CAN/LIN physical layer (voltages, continuity and bus resistance)

Signal parameters

  • TCU supply voltage (key ON): ~11–14 V (should be stable during communications)
  • TCU ground continuity: near 0 ohms to chassis
  • CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.0–2.0 V; differential ≈ 2.0 V
  • Bus termination resistance (across CAN_H and CAN_L at vehicle off): ≈ 60 ohms (two 120Ω in parallel)
  • Expected TCU message cadence: manufacturer-specific periodic messages (often 1 Hz to several Hz); absence or irregular timing may indicate fault
  • Message payload: values should be within expected ranges for telematics data (check vehicle-specific definitions with OEM tool)

Diagnostic algorithm

  1. Confirm the DTC: connect OEM-level scan tool, retrieve U2106 and related codes, record freeze frame and event counter.
  2. Check for patterns: note if code is continuous or intermittent, and whether it appears after specific events (start, driving, after module wake).
  3. Inspect harness and connectors: unclip TCU connector(s), check pins for corrosion, bent pins, water intrusion, and proper mating.
  4. Verify power & ground: back-probe TCU power and ground pins while operating to confirm stable supply and good ground.
  5. Test physical layer: with meter/ohmmeter check CAN pair continuity and measure termination resistance (~60Ω). If available, use an oscilloscope to observe CAN_H/CAN_L idle and differential waveforms and look for noise or missing dominant/recessive states.
  6. Monitor network traffic: use OEM scan tool or CAN bus analyzer to observe TCU message IDs, frequency, and payload. Compare against manufacturer expected patterns; look for malformed frames or CRC errors if supported.
  7. Wiggle and re-test: with connector mated, wiggle harnesses and connectors to check for intermittent faults while monitoring codes and messages.
  8. Software and configuration: verify TCU calibration/firmware level. Reflash or update TCU software if an update or known fix exists. Ensure any replaced module is properly programmed and security-enabled.
  9. Isolate the fault: if possible, disconnect suspect downstream modules one at a time to determine if another module is corrupting the bus. Replace or repair wiring/components only after confirming physical-layer integrity.
  10. Replace TCU only after confirming wiring, power/ground, and bus integrity. After replacement, program/configure the new TCU per OEM procedures and recheck for recurrence.

Likely causes

  • Corroded connector at TCU or ground strap causing intermittent data errors
  • Failed TCU after water intrusion or impact
  • Broken or shorted CAN/LIN pair between TCU and gateway/module
  • Unprogrammed/reprogrammed replacement TCU with incompatible calibration
  • Bus termination resistor open or high resistance causing reflections

Fault status

⚠️ Status
Invalid data received from Telematics Control Unit — communications show corrupted, missing, or out-of-range messages from the TCU.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0073 U0100 U0121 U0140 U2100 U2101
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

U2106

OPEL U — Network/User

CAN-Bus no Communication with Transmission Control Module

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

Causes

  • Faulty Telematics Control Unit (hardware or firmware)
  • Intermittent or lost power / ground to the TCU
  • Damaged, corroded, or loose connectors/wiring on the TCU harness
  • Physical layer fault on the vehicle data bus (CAN/LIN/ethernet)
  • Software/calibration mismatch after module replacement or update
  • Another module sending malformed messages or bus contention

Symptoms

  • Telematics features not working (e.g., remote services, emergency call)
  • Other modules report communication warnings or store related U-codes
  • Diagnostic tool shows invalid or missing TCU messages
  • Occasional or persistent warning lights related to networked systems
  • DTC U2106 present in scan tool with stored freeze frame

What to check

  • Read all stored and pending codes from all modules; note freeze frame and timestamps
  • Check for other U-codes that identify a broader network issue (gateway, CAN bus off)
  • Visually inspect TCU connector and wiring for corrosion, water, pin damage, bent pins
  • Verify vehicle battery voltage during key-on and while attempting communication (11–14 V)
  • Check and verify TCU ground(s) are clean, tight, and low resistance to chassis
  • Measure CAN/LIN physical layer (voltages, continuity and bus resistance)

Signal parameters

  • TCU supply voltage (key ON): ~11–14 V (should be stable during communications)
  • TCU ground continuity: near 0 ohms to chassis
  • CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.0–2.0 V; differential ≈ 2.0 V
  • Bus termination resistance (across CAN_H and CAN_L at vehicle off): ≈ 60 ohms (two 120Ω in parallel)
  • Expected TCU message cadence: manufacturer-specific periodic messages (often 1 Hz to several Hz); absence or irregular timing may indicate fault
  • Message payload: values should be within expected ranges for telematics data (check vehicle-specific definitions with OEM tool)

Diagnostic algorithm

  1. Confirm the DTC: connect OEM-level scan tool, retrieve U2106 and related codes, record freeze frame and event counter.
  2. Check for patterns: note if code is continuous or intermittent, and whether it appears after specific events (start, driving, after module wake).
  3. Inspect harness and connectors: unclip TCU connector(s), check pins for corrosion, bent pins, water intrusion, and proper mating.
  4. Verify power & ground: back-probe TCU power and ground pins while operating to confirm stable supply and good ground.
  5. Test physical layer: with meter/ohmmeter check CAN pair continuity and measure termination resistance (~60Ω). If available, use an oscilloscope to observe CAN_H/CAN_L idle and differential waveforms and look for noise or missing dominant/recessive states.
  6. Monitor network traffic: use OEM scan tool or CAN bus analyzer to observe TCU message IDs, frequency, and payload. Compare against manufacturer expected patterns; look for malformed frames or CRC errors if supported.
  7. Wiggle and re-test: with connector mated, wiggle harnesses and connectors to check for intermittent faults while monitoring codes and messages.
  8. Software and configuration: verify TCU calibration/firmware level. Reflash or update TCU software if an update or known fix exists. Ensure any replaced module is properly programmed and security-enabled.
  9. Isolate the fault: if possible, disconnect suspect downstream modules one at a time to determine if another module is corrupting the bus. Replace or repair wiring/components only after confirming physical-layer integrity.
  10. Replace TCU only after confirming wiring, power/ground, and bus integrity. After replacement, program/configure the new TCU per OEM procedures and recheck for recurrence.

Likely causes

  • Corroded connector at TCU or ground strap causing intermittent data errors
  • Failed TCU after water intrusion or impact
  • Broken or shorted CAN/LIN pair between TCU and gateway/module
  • Unprogrammed/reprogrammed replacement TCU with incompatible calibration
  • Bus termination resistor open or high resistance causing reflections

Fault status

⚠️ Status
Invalid data received from Telematics Control Unit — communications show corrupted, missing, or out-of-range messages from the TCU.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0073 U0100 U0121 U0140 U2100 U2101
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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