Code
U1218
CITROEN
U — Network/User
Fault absence of communication with the built-in systems interface (BSI): Value received incorrect
Views:
UK: 12
EN: 13
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty or corrupted BSI software or memory
- Intermittent or lost communication on the vehicle data bus (CAN/LIN)
- Damaged wiring, poor connector contacts or corrosion at BSI or other modules
- Low battery voltage or poor ground connections causing data errors
- Aftermarket electrical accessories interfering with the network
- Defective sending or receiving module providing incorrect data
Symptoms
- One or more body functions fail or behave erratically (lights, wipers, central locking, indicators)
- Instrument cluster warnings or illuminated fault indicator
- Intermittent faults that clear and return
- Vehicle may enter limp or restricted mode for affected systems
- Possible no-start or immobilizer-related symptoms if security data missing
What to check
- Read full freeze frame and all stored network-related codes from all control units
- Check battery voltage and charging system under load (ideally 12.5–14.5 V)
- Inspect BSI connectors and wiring for corrosion, bent pins, or water ingress
- Check for aftermarket accessories tied into the electrical system
- Monitor bus error counters and bus-off events with a scan tool
- Perform a visual inspection for damaged CAN/LIN cabling and grounding points
Signal parameters
- CAN High idle ~2.5 V, CAN Low idle ~2.5 V (recessive); dominant differential typically ~2.0 V
- Typical termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H and CAN_L
- Common CAN data rates 250 kb/s or 500 kb/s (verify for the specific vehicle)
- Expected periodic message intervals vary by signal (e.g., 10 ms–1 s depending on parameter)
- Watch for repeating error frames, dominant states, or flatlined signals on scope
Diagnostic algorithm
- Retrieve all U-codes and manufacturer-specific codes from every module. Note whether U1218 is current or historic and whether other modules report similar faults.
- Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
- Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
- Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
- Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
- With ignition on, measure CAN_H and CAN_L voltages at the BSI connector and at least one other module. Check termination resistance across CAN_H and CAN_L (~60 Ω).
- If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
- Disconnect suspected aftermarket devices, then clear codes and retest.
- If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
- As a last step, consider replacing the BSI or the module that is transmitting incorrect data. Reprogram/recode new modules to vehicle specifications and re-run diagnostics.
Likely causes
- Corroded or loose connector at the BSI causing bit errors
- Open/short on CAN/LIN wiring (short to ground or battery)
- Failed BSI module (internal electronics or firmware corruption)
- Faulty sensor or module on the bus transmitting wrong values
- Weak battery or charging system causing undervoltage to modules
Fault status
Status
Invalid or unexpected value received from the BSI on the vehicle communication network — communications/data integrity fault detected.
Repair difficulty: Medium
Diagnostic time: 1-4 hours
Similar codes
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Code
U1218
DS
U — Network/User
Fault absence of communication with the built-in systems interface (BSI): Value received incorrect
Views:
UK: 5
EN: 10
RU: 2
AI status
Completed
Completed
100%
Causes
- Faulty or corrupted BSI software or memory
- Intermittent or lost communication on the vehicle data bus (CAN/LIN)
- Damaged wiring, poor connector contacts or corrosion at BSI or other modules
- Low battery voltage or poor ground connections causing data errors
- Aftermarket electrical accessories interfering with the network
- Defective sending or receiving module providing incorrect data
Symptoms
- One or more body functions fail or behave erratically (lights, wipers, central locking, indicators)
- Instrument cluster warnings or illuminated fault indicator
- Intermittent faults that clear and return
- Vehicle may enter limp or restricted mode for affected systems
- Possible no-start or immobilizer-related symptoms if security data missing
What to check
- Read full freeze frame and all stored network-related codes from all control units
- Check battery voltage and charging system under load (ideally 12.5–14.5 V)
- Inspect BSI connectors and wiring for corrosion, bent pins, or water ingress
- Check for aftermarket accessories tied into the electrical system
- Monitor bus error counters and bus-off events with a scan tool
- Perform a visual inspection for damaged CAN/LIN cabling and grounding points
Signal parameters
- CAN High idle ~2.5 V, CAN Low idle ~2.5 V (recessive); dominant differential typically ~2.0 V
- Typical termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H and CAN_L
- Common CAN data rates 250 kb/s or 500 kb/s (verify for the specific vehicle)
- Expected periodic message intervals vary by signal (e.g., 10 ms–1 s depending on parameter)
- Watch for repeating error frames, dominant states, or flatlined signals on scope
Diagnostic algorithm
- Retrieve all U-codes and manufacturer-specific codes from every module. Note whether U1218 is current or historic and whether other modules report similar faults.
- Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
- Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
- Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
- Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
- With ignition on, measure CAN_H and CAN_L voltages at the BSI connector and at least one other module. Check termination resistance across CAN_H and CAN_L (~60 Ω).
- If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
- Disconnect suspected aftermarket devices, then clear codes and retest.
- If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
- As a last step, consider replacing the BSI or the module that is transmitting incorrect data. Reprogram/recode new modules to vehicle specifications and re-run diagnostics.
Likely causes
- Corroded or loose connector at the BSI causing bit errors
- Open/short on CAN/LIN wiring (short to ground or battery)
- Failed BSI module (internal electronics or firmware corruption)
- Faulty sensor or module on the bus transmitting wrong values
- Weak battery or charging system causing undervoltage to modules
Fault status
Status
Invalid or unexpected value received from the BSI on the vehicle communication network — communications/data integrity fault detected.
Repair difficulty: Medium
Diagnostic time: 1-4 hours
Similar codes
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0
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Code
U1218
LAND ROVER
U — Network/User
SCP (J1850) invalid or missing data for external lamps
Views:
UK: 18
EN: 21
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty or corrupted BSI software or memory
- Intermittent or lost communication on the vehicle data bus (CAN/LIN)
- Damaged wiring, poor connector contacts or corrosion at BSI or other modules
- Low battery voltage or poor ground connections causing data errors
- Aftermarket electrical accessories interfering with the network
- Defective sending or receiving module providing incorrect data
Symptoms
- One or more body functions fail or behave erratically (lights, wipers, central locking, indicators)
- Instrument cluster warnings or illuminated fault indicator
- Intermittent faults that clear and return
- Vehicle may enter limp or restricted mode for affected systems
- Possible no-start or immobilizer-related symptoms if security data missing
What to check
- Read full freeze frame and all stored network-related codes from all control units
- Check battery voltage and charging system under load (ideally 12.5–14.5 V)
- Inspect BSI connectors and wiring for corrosion, bent pins, or water ingress
- Check for aftermarket accessories tied into the electrical system
- Monitor bus error counters and bus-off events with a scan tool
- Perform a visual inspection for damaged CAN/LIN cabling and grounding points
Signal parameters
- CAN High idle ~2.5 V, CAN Low idle ~2.5 V (recessive); dominant differential typically ~2.0 V
- Typical termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H and CAN_L
- Common CAN data rates 250 kb/s or 500 kb/s (verify for the specific vehicle)
- Expected periodic message intervals vary by signal (e.g., 10 ms–1 s depending on parameter)
- Watch for repeating error frames, dominant states, or flatlined signals on scope
Diagnostic algorithm
- Retrieve all U-codes and manufacturer-specific codes from every module. Note whether U1218 is current or historic and whether other modules report similar faults.
- Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
- Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
- Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
- Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
- With ignition on, measure CAN_H and CAN_L voltages at the BSI connector and at least one other module. Check termination resistance across CAN_H and CAN_L (~60 Ω).
- If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
- Disconnect suspected aftermarket devices, then clear codes and retest.
- If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
- As a last step, consider replacing the BSI or the module that is transmitting incorrect data. Reprogram/recode new modules to vehicle specifications and re-run diagnostics.
Likely causes
- Corroded or loose connector at the BSI causing bit errors
- Open/short on CAN/LIN wiring (short to ground or battery)
- Failed BSI module (internal electronics or firmware corruption)
- Faulty sensor or module on the bus transmitting wrong values
- Weak battery or charging system causing undervoltage to modules
Fault status
Status
Invalid or unexpected value received from the BSI on the vehicle communication network — communications/data integrity fault detected.
Repair difficulty: Medium
Diagnostic time: 1-4 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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👍 Like
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0
Send to email
Code
U1218
Other
U — Network/User
SCP (J1850) Invalid or Missing Data for External Lamps
Views:
UK: 32
EN: 36
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty or corrupted BSI software or memory
- Intermittent or lost communication on the vehicle data bus (CAN/LIN)
- Damaged wiring, poor connector contacts or corrosion at BSI or other modules
- Low battery voltage or poor ground connections causing data errors
- Aftermarket electrical accessories interfering with the network
- Defective sending or receiving module providing incorrect data
Symptoms
- One or more body functions fail or behave erratically (lights, wipers, central locking, indicators)
- Instrument cluster warnings or illuminated fault indicator
- Intermittent faults that clear and return
- Vehicle may enter limp or restricted mode for affected systems
- Possible no-start or immobilizer-related symptoms if security data missing
What to check
- Read full freeze frame and all stored network-related codes from all control units
- Check battery voltage and charging system under load (ideally 12.5–14.5 V)
- Inspect BSI connectors and wiring for corrosion, bent pins, or water ingress
- Check for aftermarket accessories tied into the electrical system
- Monitor bus error counters and bus-off events with a scan tool
- Perform a visual inspection for damaged CAN/LIN cabling and grounding points
Signal parameters
- CAN High idle ~2.5 V, CAN Low idle ~2.5 V (recessive); dominant differential typically ~2.0 V
- Typical termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H and CAN_L
- Common CAN data rates 250 kb/s or 500 kb/s (verify for the specific vehicle)
- Expected periodic message intervals vary by signal (e.g., 10 ms–1 s depending on parameter)
- Watch for repeating error frames, dominant states, or flatlined signals on scope
Diagnostic algorithm
- Retrieve all U-codes and manufacturer-specific codes from every module. Note whether U1218 is current or historic and whether other modules report similar faults.
- Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
- Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
- Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
- Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
- With ignition on, measure CAN_H and CAN_L voltages at the BSI connector and at least one other module. Check termination resistance across CAN_H and CAN_L (~60 Ω).
- If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
- Disconnect suspected aftermarket devices, then clear codes and retest.
- If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
- As a last step, consider replacing the BSI or the module that is transmitting incorrect data. Reprogram/recode new modules to vehicle specifications and re-run diagnostics.
Likely causes
- Corroded or loose connector at the BSI causing bit errors
- Open/short on CAN/LIN wiring (short to ground or battery)
- Failed BSI module (internal electronics or firmware corruption)
- Faulty sensor or module on the bus transmitting wrong values
- Weak battery or charging system causing undervoltage to modules
Fault status
Status
Invalid or unexpected value received from the BSI on the vehicle communication network — communications/data integrity fault detected.
Repair difficulty: Medium
Diagnostic time: 1-4 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop ManualAudi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop ManualAUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop ManualAudi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop ManualAudi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop ManualAudi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop ManualAudi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop ManualAudi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop ManualAudi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop ManualAudi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop ManualAudi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop ManualLAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email
Code
U1218
PEUGEOT
U — Network/User
Fault absence of communication with the built-in systems interface (BSI): Value received incorrect
Views:
UK: 4
EN: 11
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty or corrupted BSI software or memory
- Intermittent or lost communication on the vehicle data bus (CAN/LIN)
- Damaged wiring, poor connector contacts or corrosion at BSI or other modules
- Low battery voltage or poor ground connections causing data errors
- Aftermarket electrical accessories interfering with the network
- Defective sending or receiving module providing incorrect data
Symptoms
- One or more body functions fail or behave erratically (lights, wipers, central locking, indicators)
- Instrument cluster warnings or illuminated fault indicator
- Intermittent faults that clear and return
- Vehicle may enter limp or restricted mode for affected systems
- Possible no-start or immobilizer-related symptoms if security data missing
What to check
- Read full freeze frame and all stored network-related codes from all control units
- Check battery voltage and charging system under load (ideally 12.5–14.5 V)
- Inspect BSI connectors and wiring for corrosion, bent pins, or water ingress
- Check for aftermarket accessories tied into the electrical system
- Monitor bus error counters and bus-off events with a scan tool
- Perform a visual inspection for damaged CAN/LIN cabling and grounding points
Signal parameters
- CAN High idle ~2.5 V, CAN Low idle ~2.5 V (recessive); dominant differential typically ~2.0 V
- Typical termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H and CAN_L
- Common CAN data rates 250 kb/s or 500 kb/s (verify for the specific vehicle)
- Expected periodic message intervals vary by signal (e.g., 10 ms–1 s depending on parameter)
- Watch for repeating error frames, dominant states, or flatlined signals on scope
Diagnostic algorithm
- Retrieve all U-codes and manufacturer-specific codes from every module. Note whether U1218 is current or historic and whether other modules report similar faults.
- Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
- Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
- Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
- Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
- With ignition on, measure CAN_H and CAN_L voltages at the BSI connector and at least one other module. Check termination resistance across CAN_H and CAN_L (~60 Ω).
- If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
- Disconnect suspected aftermarket devices, then clear codes and retest.
- If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
- As a last step, consider replacing the BSI or the module that is transmitting incorrect data. Reprogram/recode new modules to vehicle specifications and re-run diagnostics.
Likely causes
- Corroded or loose connector at the BSI causing bit errors
- Open/short on CAN/LIN wiring (short to ground or battery)
- Failed BSI module (internal electronics or firmware corruption)
- Faulty sensor or module on the bus transmitting wrong values
- Weak battery or charging system causing undervoltage to modules
Fault status
Status
Invalid or unexpected value received from the BSI on the vehicle communication network — communications/data integrity fault detected.
Repair difficulty: Medium
Diagnostic time: 1-4 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
0
👎 Dislike
0
Send to email