Code
U2000
CITROEN
U — Network/User
Fault in reception of the main wake-up / triggering request information on the CAN: Absence of signal or data invalid
AI status
Completed
Completed
100%
Causes
- Open, shorted or high‑resistance CAN wiring or connectors
- Missing or intermittent module power or ground
- Faulty or unresponsive sending module (BCM, BCM gateway, ignition module)
- Failed or out‑of‑date module software/calibration
- Weak battery or low system voltage preventing wake signals
- Missing or incorrect bus termination (open/misaligned 120 Ω)
Symptoms
- No communication with one or more modules on scan tool
- Modules failing to wake after door unlock or ignition on
- Central locking, remote functions or convenience features inoperative
- Instrument cluster or body systems not responding or delayed
- Intermittent faults or multiple communication DTCs present
- Vehicle enters reduced functionality or fails to start if keyless wake fails
What to check
- Confirm U2000 present and note freeze frame / related codes
- Check battery voltage at rest and during wake attempt (12.4–12.8 V nominal; >11.5 V while cranking)
- Inspect fuses and power/ground at modules involved in wake logic (BCM, gateway)
- Visually inspect CAN wiring, connectors and junctions for damage or corrosion
- Measure CAN_H and CAN_L voltages with key off and key on using a multimeter and oscilloscope
- Measure bus differential with oscilloscope to verify dominant/recessive transitions
Signal parameters
- Idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
- Termination: combined end-to-end ≈ 60 Ω (two 120 Ω in parallel)
- Wake request: periodic message on CAN or dedicated wake line — timing and ID model-specific (verify with OEM data)
- Low battery condition: voltage
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Note related U codes.
- Verify vehicle battery condition and charging system; recharge or replace battery if low.
- Inspect wiring and connectors for physical damage, corrosion or water ingress at gateway/BCM and CAN junctions.
- Check fuses and module power/ground circuits; measure supply voltage at module connectors during wake attempt.
- With a good oscilloscope or CAN analyzer, capture CAN_H/CAN_L while attempting a wake to confirm presence/quality of wake message and look for noise or missing frames.
- Measure termination resistance between CAN_H and CAN_L at harness; repair or replace missing/incorrect termination.
- Isolate sections: disconnect non‑essential modules or branch connectors to locate short or faulted node causing invalid frames.
- If physical layer and power/ground are good, check for software/calibration updates for gateway/BCM and reflash or replace module per OEM procedure.
- After repairs, clear codes and perform functional verification of wake events and full system communication; road test if required.
- If the fault persists, consult manufacturer technical bulletins and consider module replacement only after confirming diagnostics.
Likely causes
- Damaged CAN physical layer (broken conductor or short to battery/ground)
- Faulty body control/gateway module that generates the wake request
- Blown fuse or poor power/ground to the module that listens for wake message
- Disconnected or corroded connector at relevant control module
- Battery voltage too low at ignition-off or during wake attempt
Fault status
Status
Main CAN wake/trigger message not received or data invalid. The control unit did not detect a valid wake request on the network, preventing normal communication and module wake-up.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U2000
DS
U — Network/User
Fault in reception of the main wake-up / triggering request information on the CAN: Absence of signal or data invalid
AI status
Completed
Completed
100%
Causes
- Open, shorted or high‑resistance CAN wiring or connectors
- Missing or intermittent module power or ground
- Faulty or unresponsive sending module (BCM, BCM gateway, ignition module)
- Failed or out‑of‑date module software/calibration
- Weak battery or low system voltage preventing wake signals
- Missing or incorrect bus termination (open/misaligned 120 Ω)
Symptoms
- No communication with one or more modules on scan tool
- Modules failing to wake after door unlock or ignition on
- Central locking, remote functions or convenience features inoperative
- Instrument cluster or body systems not responding or delayed
- Intermittent faults or multiple communication DTCs present
- Vehicle enters reduced functionality or fails to start if keyless wake fails
What to check
- Confirm U2000 present and note freeze frame / related codes
- Check battery voltage at rest and during wake attempt (12.4–12.8 V nominal; >11.5 V while cranking)
- Inspect fuses and power/ground at modules involved in wake logic (BCM, gateway)
- Visually inspect CAN wiring, connectors and junctions for damage or corrosion
- Measure CAN_H and CAN_L voltages with key off and key on using a multimeter and oscilloscope
- Measure bus differential with oscilloscope to verify dominant/recessive transitions
Signal parameters
- Idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
- Termination: combined end-to-end ≈ 60 Ω (two 120 Ω in parallel)
- Wake request: periodic message on CAN or dedicated wake line — timing and ID model-specific (verify with OEM data)
- Low battery condition: voltage
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Note related U codes.
- Verify vehicle battery condition and charging system; recharge or replace battery if low.
- Inspect wiring and connectors for physical damage, corrosion or water ingress at gateway/BCM and CAN junctions.
- Check fuses and module power/ground circuits; measure supply voltage at module connectors during wake attempt.
- With a good oscilloscope or CAN analyzer, capture CAN_H/CAN_L while attempting a wake to confirm presence/quality of wake message and look for noise or missing frames.
- Measure termination resistance between CAN_H and CAN_L at harness; repair or replace missing/incorrect termination.
- Isolate sections: disconnect non‑essential modules or branch connectors to locate short or faulted node causing invalid frames.
- If physical layer and power/ground are good, check for software/calibration updates for gateway/BCM and reflash or replace module per OEM procedure.
- After repairs, clear codes and perform functional verification of wake events and full system communication; road test if required.
- If the fault persists, consult manufacturer technical bulletins and consider module replacement only after confirming diagnostics.
Likely causes
- Damaged CAN physical layer (broken conductor or short to battery/ground)
- Faulty body control/gateway module that generates the wake request
- Blown fuse or poor power/ground to the module that listens for wake message
- Disconnected or corroded connector at relevant control module
- Battery voltage too low at ignition-off or during wake attempt
Fault status
Status
Main CAN wake/trigger message not received or data invalid. The control unit did not detect a valid wake request on the network, preventing normal communication and module wake-up.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U2000
Generic
U — Network/User
Manufacturer Controlled DTC
AI status
Completed
Completed
100%
Causes
- Open, shorted or high‑resistance CAN wiring or connectors
- Missing or intermittent module power or ground
- Faulty or unresponsive sending module (BCM, BCM gateway, ignition module)
- Failed or out‑of‑date module software/calibration
- Weak battery or low system voltage preventing wake signals
- Missing or incorrect bus termination (open/misaligned 120 Ω)
Symptoms
- No communication with one or more modules on scan tool
- Modules failing to wake after door unlock or ignition on
- Central locking, remote functions or convenience features inoperative
- Instrument cluster or body systems not responding or delayed
- Intermittent faults or multiple communication DTCs present
- Vehicle enters reduced functionality or fails to start if keyless wake fails
What to check
- Confirm U2000 present and note freeze frame / related codes
- Check battery voltage at rest and during wake attempt (12.4–12.8 V nominal; >11.5 V while cranking)
- Inspect fuses and power/ground at modules involved in wake logic (BCM, gateway)
- Visually inspect CAN wiring, connectors and junctions for damage or corrosion
- Measure CAN_H and CAN_L voltages with key off and key on using a multimeter and oscilloscope
- Measure bus differential with oscilloscope to verify dominant/recessive transitions
Signal parameters
- Idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
- Termination: combined end-to-end ≈ 60 Ω (two 120 Ω in parallel)
- Wake request: periodic message on CAN or dedicated wake line — timing and ID model-specific (verify with OEM data)
- Low battery condition: voltage
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Note related U codes.
- Verify vehicle battery condition and charging system; recharge or replace battery if low.
- Inspect wiring and connectors for physical damage, corrosion or water ingress at gateway/BCM and CAN junctions.
- Check fuses and module power/ground circuits; measure supply voltage at module connectors during wake attempt.
- With a good oscilloscope or CAN analyzer, capture CAN_H/CAN_L while attempting a wake to confirm presence/quality of wake message and look for noise or missing frames.
- Measure termination resistance between CAN_H and CAN_L at harness; repair or replace missing/incorrect termination.
- Isolate sections: disconnect non‑essential modules or branch connectors to locate short or faulted node causing invalid frames.
- If physical layer and power/ground are good, check for software/calibration updates for gateway/BCM and reflash or replace module per OEM procedure.
- After repairs, clear codes and perform functional verification of wake events and full system communication; road test if required.
- If the fault persists, consult manufacturer technical bulletins and consider module replacement only after confirming diagnostics.
Likely causes
- Damaged CAN physical layer (broken conductor or short to battery/ground)
- Faulty body control/gateway module that generates the wake request
- Blown fuse or poor power/ground to the module that listens for wake message
- Disconnected or corroded connector at relevant control module
- Battery voltage too low at ignition-off or during wake attempt
Fault status
Status
Main CAN wake/trigger message not received or data invalid. The control unit did not detect a valid wake request on the network, preventing normal communication and module wake-up.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
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Code
U2000
HUMMER
U — Network/User
Invalid BFC Transmitted SPI Data
AI status
Completed
Completed
100%
Causes
- Open, shorted or high‑resistance CAN wiring or connectors
- Missing or intermittent module power or ground
- Faulty or unresponsive sending module (BCM, BCM gateway, ignition module)
- Failed or out‑of‑date module software/calibration
- Weak battery or low system voltage preventing wake signals
- Missing or incorrect bus termination (open/misaligned 120 Ω)
Symptoms
- No communication with one or more modules on scan tool
- Modules failing to wake after door unlock or ignition on
- Central locking, remote functions or convenience features inoperative
- Instrument cluster or body systems not responding or delayed
- Intermittent faults or multiple communication DTCs present
- Vehicle enters reduced functionality or fails to start if keyless wake fails
What to check
- Confirm U2000 present and note freeze frame / related codes
- Check battery voltage at rest and during wake attempt (12.4–12.8 V nominal; >11.5 V while cranking)
- Inspect fuses and power/ground at modules involved in wake logic (BCM, gateway)
- Visually inspect CAN wiring, connectors and junctions for damage or corrosion
- Measure CAN_H and CAN_L voltages with key off and key on using a multimeter and oscilloscope
- Measure bus differential with oscilloscope to verify dominant/recessive transitions
Signal parameters
- Idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
- Termination: combined end-to-end ≈ 60 Ω (two 120 Ω in parallel)
- Wake request: periodic message on CAN or dedicated wake line — timing and ID model-specific (verify with OEM data)
- Low battery condition: voltage
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Note related U codes.
- Verify vehicle battery condition and charging system; recharge or replace battery if low.
- Inspect wiring and connectors for physical damage, corrosion or water ingress at gateway/BCM and CAN junctions.
- Check fuses and module power/ground circuits; measure supply voltage at module connectors during wake attempt.
- With a good oscilloscope or CAN analyzer, capture CAN_H/CAN_L while attempting a wake to confirm presence/quality of wake message and look for noise or missing frames.
- Measure termination resistance between CAN_H and CAN_L at harness; repair or replace missing/incorrect termination.
- Isolate sections: disconnect non‑essential modules or branch connectors to locate short or faulted node causing invalid frames.
- If physical layer and power/ground are good, check for software/calibration updates for gateway/BCM and reflash or replace module per OEM procedure.
- After repairs, clear codes and perform functional verification of wake events and full system communication; road test if required.
- If the fault persists, consult manufacturer technical bulletins and consider module replacement only after confirming diagnostics.
Likely causes
- Damaged CAN physical layer (broken conductor or short to battery/ground)
- Faulty body control/gateway module that generates the wake request
- Blown fuse or poor power/ground to the module that listens for wake message
- Disconnected or corroded connector at relevant control module
- Battery voltage too low at ignition-off or during wake attempt
Fault status
Status
Main CAN wake/trigger message not received or data invalid. The control unit did not detect a valid wake request on the network, preventing normal communication and module wake-up.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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.
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HUMMER: 2009
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HUMMER: 1993
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Code
U2000
LAND ROVER
U — Network/User
Engine temperature
AI status
Completed
Completed
100%
Causes
- Open, shorted or high‑resistance CAN wiring or connectors
- Missing or intermittent module power or ground
- Faulty or unresponsive sending module (BCM, BCM gateway, ignition module)
- Failed or out‑of‑date module software/calibration
- Weak battery or low system voltage preventing wake signals
- Missing or incorrect bus termination (open/misaligned 120 Ω)
Symptoms
- No communication with one or more modules on scan tool
- Modules failing to wake after door unlock or ignition on
- Central locking, remote functions or convenience features inoperative
- Instrument cluster or body systems not responding or delayed
- Intermittent faults or multiple communication DTCs present
- Vehicle enters reduced functionality or fails to start if keyless wake fails
What to check
- Confirm U2000 present and note freeze frame / related codes
- Check battery voltage at rest and during wake attempt (12.4–12.8 V nominal; >11.5 V while cranking)
- Inspect fuses and power/ground at modules involved in wake logic (BCM, gateway)
- Visually inspect CAN wiring, connectors and junctions for damage or corrosion
- Measure CAN_H and CAN_L voltages with key off and key on using a multimeter and oscilloscope
- Measure bus differential with oscilloscope to verify dominant/recessive transitions
Signal parameters
- Idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
- Termination: combined end-to-end ≈ 60 Ω (two 120 Ω in parallel)
- Wake request: periodic message on CAN or dedicated wake line — timing and ID model-specific (verify with OEM data)
- Low battery condition: voltage
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Note related U codes.
- Verify vehicle battery condition and charging system; recharge or replace battery if low.
- Inspect wiring and connectors for physical damage, corrosion or water ingress at gateway/BCM and CAN junctions.
- Check fuses and module power/ground circuits; measure supply voltage at module connectors during wake attempt.
- With a good oscilloscope or CAN analyzer, capture CAN_H/CAN_L while attempting a wake to confirm presence/quality of wake message and look for noise or missing frames.
- Measure termination resistance between CAN_H and CAN_L at harness; repair or replace missing/incorrect termination.
- Isolate sections: disconnect non‑essential modules or branch connectors to locate short or faulted node causing invalid frames.
- If physical layer and power/ground are good, check for software/calibration updates for gateway/BCM and reflash or replace module per OEM procedure.
- After repairs, clear codes and perform functional verification of wake events and full system communication; road test if required.
- If the fault persists, consult manufacturer technical bulletins and consider module replacement only after confirming diagnostics.
Likely causes
- Damaged CAN physical layer (broken conductor or short to battery/ground)
- Faulty body control/gateway module that generates the wake request
- Blown fuse or poor power/ground to the module that listens for wake message
- Disconnected or corroded connector at relevant control module
- Battery voltage too low at ignition-off or during wake attempt
Fault status
Status
Main CAN wake/trigger message not received or data invalid. The control unit did not detect a valid wake request on the network, preventing normal communication and module wake-up.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for LAND ROVER
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
-
LAND ROVER: 2022
-
Defender
- 90
- 90
- 90 S
- 90 S
- 90 V8
- 90 V8
- 90 V8 Carpathian Edition
- 90 V8 Carpathian Edition
- 90 X
- 90 X
- 90 X-Dynamic HSE
- 90 X-Dynamic HSE
- 90 X-Dynamic S
- 90 X-Dynamic S
- 90 X-Dynamic SE
- 90 X-Dynamic SE
- 110
- 110
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 V8
- 110 V8
- 110 V8 Carpathian Edition
- 110 V8 Carpathian Edition
- 110 X
- 110 X
- 110 X-Dynamic SE
- 110 X-Dynamic SE
- 110 XS Edition
- 110 XS Edition
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Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- 2022 Range Rover Base
- 2022 Range Rover Base
- First Edition
- First Edition
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SV
- SV
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
-
-
LAND ROVER: 2021
-
Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography Fifty Edition
- Autobiography Fifty Edition
- 2021 Range Rover Base
- 2021 Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- HSE Dynamic
- HSE Dynamic
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HST
- HST
- SE
- SE
- SVR
- SVR
- SVR Carbon Edition
- SVR Carbon Edition
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
-
LAND ROVER: 2020
-
Defender
- 90 First Edition
- 90 First Edition
- 110 First Edition
- 110 First Edition
- 110 HSE
- 110 HSE
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 X
- 110 X
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
-
Discovery
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- Landmark
- Landmark
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
-
Range Rover
- Autobiography
- Autobiography
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE Dynamic
- HSE Dynamic
- HSE PHEV
- HSE PHEV
- HST
- HST
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SVR
- SVR
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- SVAutobiography Dyn.
- SVAutobiography Dyn.
-
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Code
U2000
Other
U — Network/User
Audio Rear Control Unit is Not Responding
AI status
Completed
Completed
100%
Causes
- Open, shorted or high‑resistance CAN wiring or connectors
- Missing or intermittent module power or ground
- Faulty or unresponsive sending module (BCM, BCM gateway, ignition module)
- Failed or out‑of‑date module software/calibration
- Weak battery or low system voltage preventing wake signals
- Missing or incorrect bus termination (open/misaligned 120 Ω)
Symptoms
- No communication with one or more modules on scan tool
- Modules failing to wake after door unlock or ignition on
- Central locking, remote functions or convenience features inoperative
- Instrument cluster or body systems not responding or delayed
- Intermittent faults or multiple communication DTCs present
- Vehicle enters reduced functionality or fails to start if keyless wake fails
What to check
- Confirm U2000 present and note freeze frame / related codes
- Check battery voltage at rest and during wake attempt (12.4–12.8 V nominal; >11.5 V while cranking)
- Inspect fuses and power/ground at modules involved in wake logic (BCM, gateway)
- Visually inspect CAN wiring, connectors and junctions for damage or corrosion
- Measure CAN_H and CAN_L voltages with key off and key on using a multimeter and oscilloscope
- Measure bus differential with oscilloscope to verify dominant/recessive transitions
Signal parameters
- Idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
- Termination: combined end-to-end ≈ 60 Ω (two 120 Ω in parallel)
- Wake request: periodic message on CAN or dedicated wake line — timing and ID model-specific (verify with OEM data)
- Low battery condition: voltage
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Note related U codes.
- Verify vehicle battery condition and charging system; recharge or replace battery if low.
- Inspect wiring and connectors for physical damage, corrosion or water ingress at gateway/BCM and CAN junctions.
- Check fuses and module power/ground circuits; measure supply voltage at module connectors during wake attempt.
- With a good oscilloscope or CAN analyzer, capture CAN_H/CAN_L while attempting a wake to confirm presence/quality of wake message and look for noise or missing frames.
- Measure termination resistance between CAN_H and CAN_L at harness; repair or replace missing/incorrect termination.
- Isolate sections: disconnect non‑essential modules or branch connectors to locate short or faulted node causing invalid frames.
- If physical layer and power/ground are good, check for software/calibration updates for gateway/BCM and reflash or replace module per OEM procedure.
- After repairs, clear codes and perform functional verification of wake events and full system communication; road test if required.
- If the fault persists, consult manufacturer technical bulletins and consider module replacement only after confirming diagnostics.
Likely causes
- Damaged CAN physical layer (broken conductor or short to battery/ground)
- Faulty body control/gateway module that generates the wake request
- Blown fuse or poor power/ground to the module that listens for wake message
- Disconnected or corroded connector at relevant control module
- Battery voltage too low at ignition-off or during wake attempt
Fault status
Status
Main CAN wake/trigger message not received or data invalid. The control unit did not detect a valid wake request on the network, preventing normal communication and module wake-up.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
U2000
PEUGEOT
U — Network/User
Fault in reception of the main wake-up / triggering request information on the CAN: Absence of signal or data invalid
AI status
Completed
Completed
100%
Causes
- Open, shorted or high‑resistance CAN wiring or connectors
- Missing or intermittent module power or ground
- Faulty or unresponsive sending module (BCM, BCM gateway, ignition module)
- Failed or out‑of‑date module software/calibration
- Weak battery or low system voltage preventing wake signals
- Missing or incorrect bus termination (open/misaligned 120 Ω)
Symptoms
- No communication with one or more modules on scan tool
- Modules failing to wake after door unlock or ignition on
- Central locking, remote functions or convenience features inoperative
- Instrument cluster or body systems not responding or delayed
- Intermittent faults or multiple communication DTCs present
- Vehicle enters reduced functionality or fails to start if keyless wake fails
What to check
- Confirm U2000 present and note freeze frame / related codes
- Check battery voltage at rest and during wake attempt (12.4–12.8 V nominal; >11.5 V while cranking)
- Inspect fuses and power/ground at modules involved in wake logic (BCM, gateway)
- Visually inspect CAN wiring, connectors and junctions for damage or corrosion
- Measure CAN_H and CAN_L voltages with key off and key on using a multimeter and oscilloscope
- Measure bus differential with oscilloscope to verify dominant/recessive transitions
Signal parameters
- Idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
- Termination: combined end-to-end ≈ 60 Ω (two 120 Ω in parallel)
- Wake request: periodic message on CAN or dedicated wake line — timing and ID model-specific (verify with OEM data)
- Low battery condition: voltage
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Note related U codes.
- Verify vehicle battery condition and charging system; recharge or replace battery if low.
- Inspect wiring and connectors for physical damage, corrosion or water ingress at gateway/BCM and CAN junctions.
- Check fuses and module power/ground circuits; measure supply voltage at module connectors during wake attempt.
- With a good oscilloscope or CAN analyzer, capture CAN_H/CAN_L while attempting a wake to confirm presence/quality of wake message and look for noise or missing frames.
- Measure termination resistance between CAN_H and CAN_L at harness; repair or replace missing/incorrect termination.
- Isolate sections: disconnect non‑essential modules or branch connectors to locate short or faulted node causing invalid frames.
- If physical layer and power/ground are good, check for software/calibration updates for gateway/BCM and reflash or replace module per OEM procedure.
- After repairs, clear codes and perform functional verification of wake events and full system communication; road test if required.
- If the fault persists, consult manufacturer technical bulletins and consider module replacement only after confirming diagnostics.
Likely causes
- Damaged CAN physical layer (broken conductor or short to battery/ground)
- Faulty body control/gateway module that generates the wake request
- Blown fuse or poor power/ground to the module that listens for wake message
- Disconnected or corroded connector at relevant control module
- Battery voltage too low at ignition-off or during wake attempt
Fault status
Status
Main CAN wake/trigger message not received or data invalid. The control unit did not detect a valid wake request on the network, preventing normal communication and module wake-up.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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