Code
U2118
CITROEN
U — Network/User
Vehicle speed wake-up status word reception anomaly fault by the BSI: Data invalid
AI status
Completed
Completed
100%
Causes
- Faulty sender module (instrument cluster, gateway or ABS/ESP module) transmitting the wake-up/status message
- Damaged CAN/LIN wiring or poor connector/ground at the BSI or sender module
- CAN bus interference, short to battery/ground or bus off condition
- Low or unstable battery voltage or poor power/ground to BSI or sender module
- Software/firmware mismatch, corrupted module software or configuration
- Intermittent module or connector corrosion causing corrupted frames
Symptoms
- Communication-related warning messages or lamp illumination
- Speedometer/odometer or instrument cluster incorrect or inoperative
- Automatic wake/sleep functions not working (central locking, remote wake, timers)
- Cruise control, start/stop or other speed-dependent functions may be disabled
- Intermittent or permanent loss of related vehicle features
- Possible battery drain if modules fail to enter sleep
What to check
- Read all stored and pending U- and P-codes from all modules; note occurrence frequency and freeze frame data
- Check battery voltage and charging system; ensure good battery state (12.4–12.8 V resting) and stable voltage during cranking
- Inspect BSI and relevant module connectors for corrosion, bent pins, water ingress, or poor mating
- Visually inspect CAN/LIN wiring for chafing, damage or repairs between BSI and speed-sending modules (ABS, cluster, gateway)
- Use a diagnostic tool to list modules present on the bus and check for any module 'not present' or communication errors
- Monitor live data for vehicle speed and wake-up status words from the sending module(s) while observing for valid values
Signal parameters
- Message: vehicle speed / wake-up status word transmitted on vehicle CAN (manufacturer-specific message)
- Expected: properly formatted CAN frames with correct ID, DLC and checksum if used; consistent message frequency during wake
- Typical values: vehicle speed field should be within physically possible range (0–vehicle max) and status bits indicating wake/sleep state valid
- Electrical: CAN bus idle voltages CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 0.5–2.5 V; differential when active ~2.5 V
- Timing: message refresh rate depends on manufacturer — watch for missing frames or irregular intervals
Diagnostic algorithm
- Confirm and document the fault: read and save full diagnostic report, note occurrence count and any accompanying codes.
- Clear code and perform a road/wake test to see if U2118 returns. Observe live data while driving or during wake sequence.
- Check battery state and ensure stable supply to BSI and sender modules; repair or replace battery if voltage is poor.
- Visually inspect and secure all related connectors (BSI, instrument cluster, ABS/ESP, gateway). Clean and re-seat where necessary.
- Use a diagnostic tool to query the sending module(s) for vehicle speed and wake status. If the sender reports invalid data, focus on that module.
- Monitor the CAN bus with a scan tool or oscilloscope: verify presence of the expected message ID, correct DLC and consistent timing. Look for corrupted frames or bus errors.
- If a particular module is not transmitting or is sending corrupt data, perform module-specific tests (wheel speed sensors for ABS, cluster self-tests). Repair or replace faulty sensors or module as indicated.
- Check/repair wiring harness faults between the sender and BSI (continuity, resistance, shorts to battery/ground).
- If wiring and sensors are good, consider BSI firmware update or reprogramming per manufacturer service information.
- If fault persists after logical checks and software updates, consider replacing the defective module (BSI or sender) and re-test.
- Note: follow manufacturer service documentation and use appropriate tools for CAN network isolation and module programming.
Likely causes
- Poor connector/ground at BSI or at the module that provides vehicle speed (wheel speed/ABS or instrument cluster)
- CAN wiring open/short between sender module and BSI
- Faulty ABS/ESP or instrument cluster sending invalid speed/wake data
- BSI software fault or BSI internal failure
- Temporary bus communication error after battery disconnect or jump-start
Fault status
Status
BSI - Vehicle speed wake-up status word received is invalid (communication/data error).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U2118
DS
U — Network/User
Vehicle speed wake-up status word reception anomaly fault by the BSI: Data invalid
AI status
Completed
Completed
100%
Causes
- Faulty sender module (instrument cluster, gateway or ABS/ESP module) transmitting the wake-up/status message
- Damaged CAN/LIN wiring or poor connector/ground at the BSI or sender module
- CAN bus interference, short to battery/ground or bus off condition
- Low or unstable battery voltage or poor power/ground to BSI or sender module
- Software/firmware mismatch, corrupted module software or configuration
- Intermittent module or connector corrosion causing corrupted frames
Symptoms
- Communication-related warning messages or lamp illumination
- Speedometer/odometer or instrument cluster incorrect or inoperative
- Automatic wake/sleep functions not working (central locking, remote wake, timers)
- Cruise control, start/stop or other speed-dependent functions may be disabled
- Intermittent or permanent loss of related vehicle features
- Possible battery drain if modules fail to enter sleep
What to check
- Read all stored and pending U- and P-codes from all modules; note occurrence frequency and freeze frame data
- Check battery voltage and charging system; ensure good battery state (12.4–12.8 V resting) and stable voltage during cranking
- Inspect BSI and relevant module connectors for corrosion, bent pins, water ingress, or poor mating
- Visually inspect CAN/LIN wiring for chafing, damage or repairs between BSI and speed-sending modules (ABS, cluster, gateway)
- Use a diagnostic tool to list modules present on the bus and check for any module 'not present' or communication errors
- Monitor live data for vehicle speed and wake-up status words from the sending module(s) while observing for valid values
Signal parameters
- Message: vehicle speed / wake-up status word transmitted on vehicle CAN (manufacturer-specific message)
- Expected: properly formatted CAN frames with correct ID, DLC and checksum if used; consistent message frequency during wake
- Typical values: vehicle speed field should be within physically possible range (0–vehicle max) and status bits indicating wake/sleep state valid
- Electrical: CAN bus idle voltages CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 0.5–2.5 V; differential when active ~2.5 V
- Timing: message refresh rate depends on manufacturer — watch for missing frames or irregular intervals
Diagnostic algorithm
- Confirm and document the fault: read and save full diagnostic report, note occurrence count and any accompanying codes.
- Clear code and perform a road/wake test to see if U2118 returns. Observe live data while driving or during wake sequence.
- Check battery state and ensure stable supply to BSI and sender modules; repair or replace battery if voltage is poor.
- Visually inspect and secure all related connectors (BSI, instrument cluster, ABS/ESP, gateway). Clean and re-seat where necessary.
- Use a diagnostic tool to query the sending module(s) for vehicle speed and wake status. If the sender reports invalid data, focus on that module.
- Monitor the CAN bus with a scan tool or oscilloscope: verify presence of the expected message ID, correct DLC and consistent timing. Look for corrupted frames or bus errors.
- If a particular module is not transmitting or is sending corrupt data, perform module-specific tests (wheel speed sensors for ABS, cluster self-tests). Repair or replace faulty sensors or module as indicated.
- Check/repair wiring harness faults between the sender and BSI (continuity, resistance, shorts to battery/ground).
- If wiring and sensors are good, consider BSI firmware update or reprogramming per manufacturer service information.
- If fault persists after logical checks and software updates, consider replacing the defective module (BSI or sender) and re-test.
- Note: follow manufacturer service documentation and use appropriate tools for CAN network isolation and module programming.
Likely causes
- Poor connector/ground at BSI or at the module that provides vehicle speed (wheel speed/ABS or instrument cluster)
- CAN wiring open/short between sender module and BSI
- Faulty ABS/ESP or instrument cluster sending invalid speed/wake data
- BSI software fault or BSI internal failure
- Temporary bus communication error after battery disconnect or jump-start
Fault status
Status
BSI - Vehicle speed wake-up status word received is invalid (communication/data error).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U2118
PEUGEOT
U — Network/User
Vehicle speed wake-up status word reception anomaly fault by the BSI: Data invalid
AI status
Completed
Completed
100%
Causes
- Faulty sender module (instrument cluster, gateway or ABS/ESP module) transmitting the wake-up/status message
- Damaged CAN/LIN wiring or poor connector/ground at the BSI or sender module
- CAN bus interference, short to battery/ground or bus off condition
- Low or unstable battery voltage or poor power/ground to BSI or sender module
- Software/firmware mismatch, corrupted module software or configuration
- Intermittent module or connector corrosion causing corrupted frames
Symptoms
- Communication-related warning messages or lamp illumination
- Speedometer/odometer or instrument cluster incorrect or inoperative
- Automatic wake/sleep functions not working (central locking, remote wake, timers)
- Cruise control, start/stop or other speed-dependent functions may be disabled
- Intermittent or permanent loss of related vehicle features
- Possible battery drain if modules fail to enter sleep
What to check
- Read all stored and pending U- and P-codes from all modules; note occurrence frequency and freeze frame data
- Check battery voltage and charging system; ensure good battery state (12.4–12.8 V resting) and stable voltage during cranking
- Inspect BSI and relevant module connectors for corrosion, bent pins, water ingress, or poor mating
- Visually inspect CAN/LIN wiring for chafing, damage or repairs between BSI and speed-sending modules (ABS, cluster, gateway)
- Use a diagnostic tool to list modules present on the bus and check for any module 'not present' or communication errors
- Monitor live data for vehicle speed and wake-up status words from the sending module(s) while observing for valid values
Signal parameters
- Message: vehicle speed / wake-up status word transmitted on vehicle CAN (manufacturer-specific message)
- Expected: properly formatted CAN frames with correct ID, DLC and checksum if used; consistent message frequency during wake
- Typical values: vehicle speed field should be within physically possible range (0–vehicle max) and status bits indicating wake/sleep state valid
- Electrical: CAN bus idle voltages CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 0.5–2.5 V; differential when active ~2.5 V
- Timing: message refresh rate depends on manufacturer — watch for missing frames or irregular intervals
Diagnostic algorithm
- Confirm and document the fault: read and save full diagnostic report, note occurrence count and any accompanying codes.
- Clear code and perform a road/wake test to see if U2118 returns. Observe live data while driving or during wake sequence.
- Check battery state and ensure stable supply to BSI and sender modules; repair or replace battery if voltage is poor.
- Visually inspect and secure all related connectors (BSI, instrument cluster, ABS/ESP, gateway). Clean and re-seat where necessary.
- Use a diagnostic tool to query the sending module(s) for vehicle speed and wake status. If the sender reports invalid data, focus on that module.
- Monitor the CAN bus with a scan tool or oscilloscope: verify presence of the expected message ID, correct DLC and consistent timing. Look for corrupted frames or bus errors.
- If a particular module is not transmitting or is sending corrupt data, perform module-specific tests (wheel speed sensors for ABS, cluster self-tests). Repair or replace faulty sensors or module as indicated.
- Check/repair wiring harness faults between the sender and BSI (continuity, resistance, shorts to battery/ground).
- If wiring and sensors are good, consider BSI firmware update or reprogramming per manufacturer service information.
- If fault persists after logical checks and software updates, consider replacing the defective module (BSI or sender) and re-test.
- Note: follow manufacturer service documentation and use appropriate tools for CAN network isolation and module programming.
Likely causes
- Poor connector/ground at BSI or at the module that provides vehicle speed (wheel speed/ABS or instrument cluster)
- CAN wiring open/short between sender module and BSI
- Faulty ABS/ESP or instrument cluster sending invalid speed/wake data
- BSI software fault or BSI internal failure
- Temporary bus communication error after battery disconnect or jump-start
Fault status
Status
BSI - Vehicle speed wake-up status word received is invalid (communication/data error).
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?
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