Code
U2106
HUMMER
U — Network/User
Invalid Data Received From Telematics Control Unit
Views:
UK: 16
EN: 24
RU: 17
AI status
Completed
Completed
100%
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
- Confirm the DTC: connect OEM-level scan tool, retrieve U2106 and related codes, record freeze frame and event counter.
- Check for patterns: note if code is continuous or intermittent, and whether it appears after specific events (start, driving, after module wake).
- Inspect harness and connectors: unclip TCU connector(s), check pins for corrosion, bent pins, water intrusion, and proper mating.
- Verify power & ground: back-probe TCU power and ground pins while operating to confirm stable supply and good ground.
- 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.
- 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.
- Wiggle and re-test: with connector mated, wiggle harnesses and connectors to check for intermittent faults while monitoring codes and messages.
- 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.
- 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.
- 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
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Code
U2106
LAND ROVER
U — Network/User
Signal of the package switching B
Views:
UK: 15
EN: 32
RU: 15
AI status
Completed
Completed
100%
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
- Confirm the DTC: connect OEM-level scan tool, retrieve U2106 and related codes, record freeze frame and event counter.
- Check for patterns: note if code is continuous or intermittent, and whether it appears after specific events (start, driving, after module wake).
- Inspect harness and connectors: unclip TCU connector(s), check pins for corrosion, bent pins, water intrusion, and proper mating.
- Verify power & ground: back-probe TCU power and ground pins while operating to confirm stable supply and good ground.
- 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.
- 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.
- Wiggle and re-test: with connector mated, wiggle harnesses and connectors to check for intermittent faults while monitoring codes and messages.
- 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.
- 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.
- 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
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
U2106
OPEL
U — Network/User
CAN-Bus no Communication with Transmission Control Module
Views:
UK: 7
EN: 13
RU: 10
AI status
Completed
Completed
100%
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
- Confirm the DTC: connect OEM-level scan tool, retrieve U2106 and related codes, record freeze frame and event counter.
- Check for patterns: note if code is continuous or intermittent, and whether it appears after specific events (start, driving, after module wake).
- Inspect harness and connectors: unclip TCU connector(s), check pins for corrosion, bent pins, water intrusion, and proper mating.
- Verify power & ground: back-probe TCU power and ground pins while operating to confirm stable supply and good ground.
- 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.
- 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.
- Wiggle and re-test: with connector mated, wiggle harnesses and connectors to check for intermittent faults while monitoring codes and messages.
- 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.
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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