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Home / DTC / U1218 — Fault absence of communication with the built-in systems interface (BSI): Value received incorrect

U1218 — Fault absence of communication with the built-in systems interface (BSI): Value received incorrect

Detailed page for trouble code U1218.

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11,925generic
23,694specific
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Code

U1218

CITROEN U — Network/User

Fault absence of communication with the built-in systems interface (BSI): Value received incorrect

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

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

  1. 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.
  2. Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
  3. Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
  4. Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
  5. Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
  6. 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).
  7. If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
  8. Disconnect suspected aftermarket devices, then clear codes and retest.
  9. If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
  10. 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

U0100 U0121 U1100 U1216 U1217
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Code

U1218

DS U — Network/User

Fault absence of communication with the built-in systems interface (BSI): Value received incorrect

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

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

  1. 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.
  2. Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
  3. Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
  4. Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
  5. Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
  6. 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).
  7. If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
  8. Disconnect suspected aftermarket devices, then clear codes and retest.
  9. If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
  10. 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

U0100 U0121 U1100 U1216 U1217
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Keep it short and practical. Up to 500 characters.
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Code

U1218

LAND ROVER U — Network/User

SCP (J1850) invalid or missing data for external lamps

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

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

  1. 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.
  2. Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
  3. Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
  4. Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
  5. Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
  6. 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).
  7. If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
  8. Disconnect suspected aftermarket devices, then clear codes and retest.
  9. If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
  10. 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

U0100 U0121 U1100 U1216 U1217
413

Browse 413 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.
Send to email
Code

U1218

Other U — Network/User

SCP (J1850) Invalid or Missing Data for External Lamps

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

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

  1. 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.
  2. Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
  3. Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
  4. Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
  5. Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
  6. 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).
  7. If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
  8. Disconnect suspected aftermarket devices, then clear codes and retest.
  9. If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
  10. 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

U0100 U0121 U1100 U1216 U1217
10,886

The library contains 10,886 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

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VOLVO
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Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

U1218

PEUGEOT U — Network/User

Fault absence of communication with the built-in systems interface (BSI): Value received incorrect

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

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

  1. 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.
  2. Clear codes and attempt to reproduce the fault. Observe whether the code returns immediately or after a specific action.
  3. Verify battery state of charge and charging system. Ensure voltage is stable during tests (>12 V at rest, >13.5 V with engine running).
  4. Inspect the BSI connector(s) and wiring harness for corrosion, water damage, loose pins, or broken wires. Repair any physical damage found.
  5. Using a scan tool, monitor the network for message absence, incorrect values, or bus errors. Note which message IDs/parameters are affected.
  6. 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).
  7. If intermittent or noisy communications suspected, use an oscilloscope to view CAN signals for noise, dominant states, or missing packets.
  8. Disconnect suspected aftermarket devices, then clear codes and retest.
  9. If wiring and bus integrity are good but incorrect values persist, try reflashing or updating BSI software if an update is available and supported.
  10. 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

U0100 U0121 U1100 U1216 U1217
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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