Code
U1111
HYUNDAI
U — Network/User
Battery Sensor fault detected by ECU | BS_signal frame(Data) Error | Lin Message Timeout with EBS
Views:
UK: 13
EN: 20
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty battery sensor (battery monitoring unit) or internal electronics
- Open, short, high resistance or intermittent connection on LIN bus wiring or sensor connector
- Corroded or damaged ground or battery connections
- Low system voltage or unstable battery/charging system
- Faulty ECU, EBS module or LIN master node
- Software/firmware mismatch or known communications bug
Symptoms
- Battery/BMS warning lamp or message on instrument cluster
- Stored U1111 and possibly related communication or battery codes
- Battery state-of-charge, current or temperature not displayed or incorrect
- Reduced charging control or limp charging strategy
- Hard or no-start intermittently if battery monitoring is required for start logic
- Brake/EBS-related warnings if EBS depends on battery sensor data
What to check
- Read DTCs and freeze frame data with a capable diagnostic tool; record occurrence frequency and associated codes
- Visually inspect battery sensor connector, LIN wiring, harness for corrosion, damage, pin push-out or water intrusion
- Check battery voltage at rest and cranking; verify charging system voltage with engine running
- Check fuses and relays for BMS, ECU and LIN bus power circuits
- Use a scope or multimeter to monitor LIN line for expected idle voltage and communication pulses while cranking and running
- Wiggle-test connectors and wiring while monitoring live LIN frames to reproduce intermittent faults
Signal parameters
- LIN frame name: Battery Sensor (BS_signal) — data length typically up to 8 bytes
- Expected frame period: nominal LIN master polling period (commonly tens to hundreds of ms depending on system)
- Timeout threshold: fault logged when expected frame(s) are not received within defined timeout window (commonly 2–5 polling cycles)
- Key data bytes: battery voltage, pack current, state-of-charge (SOC), temperature, status/flags byte (checksum or error flags)
- Physical: LIN bus idle voltage ~12 V supply referenced through pull-up (actual idle voltage depends on local LIN transceiver design)
- Signal quality: no dominant low stuck or continuous noise; clear single-ended transitions when frames are transmitted
Diagnostic algorithm
- Connect a diagnostic tool and capture live datastreams and DTC occurrence history. Note other active communication codes.
- Attempt to reproduce problem (key on, start/stop, drive cycle) while watching the BS_signal frame and related parameters.
- Visually inspect and repair any damaged connectors, terminal corrosion or poorly crimped wires at the battery sensor and ECU/EBS connectors.
- Measure battery voltage and ground integrity; repair any low or unstable supply before further LIN checks.
- Backprobe LIN line at sensor and at master node; use an oscilloscope or logic analyzer to confirm frame timing, amplitude and absence of noise. Look for missing frames or CRC/frame errors.
- Perform wiggle and load tests on wiring while monitoring messages to isolate intermittent faults.
- If wiring and power are good, swap in a known-good battery sensor module (or substitute known-good module if available) and verify if DTC clears.
- Check for and apply ECU/EBS/battery sensor software updates per service information; clear codes and retest multiple cycles.
- If fault persists after wiring, power and software verified, follow manufacturer procedures to test/replace ECU or EBS module as required.
- After repair, clear codes and perform extended verification drive to ensure no reoccurrence.
Likely causes
- Intermittent/failed connector or damaged wiring on LIN line to battery sensor
- Faulty battery sensor module
- Low battery voltage or charging system issue affecting communications
Fault status
Status
LIN message timeout / BS_signal frame error — ECU not receiving valid battery sensor data (communication lost or corrupted).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1111
MITSUBISHI
U — Network/User
Display CAN timeout/Not equipped
Views:
UK: 10
EN: 13
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty battery sensor (battery monitoring unit) or internal electronics
- Open, short, high resistance or intermittent connection on LIN bus wiring or sensor connector
- Corroded or damaged ground or battery connections
- Low system voltage or unstable battery/charging system
- Faulty ECU, EBS module or LIN master node
- Software/firmware mismatch or known communications bug
Symptoms
- Battery/BMS warning lamp or message on instrument cluster
- Stored U1111 and possibly related communication or battery codes
- Battery state-of-charge, current or temperature not displayed or incorrect
- Reduced charging control or limp charging strategy
- Hard or no-start intermittently if battery monitoring is required for start logic
- Brake/EBS-related warnings if EBS depends on battery sensor data
What to check
- Read DTCs and freeze frame data with a capable diagnostic tool; record occurrence frequency and associated codes
- Visually inspect battery sensor connector, LIN wiring, harness for corrosion, damage, pin push-out or water intrusion
- Check battery voltage at rest and cranking; verify charging system voltage with engine running
- Check fuses and relays for BMS, ECU and LIN bus power circuits
- Use a scope or multimeter to monitor LIN line for expected idle voltage and communication pulses while cranking and running
- Wiggle-test connectors and wiring while monitoring live LIN frames to reproduce intermittent faults
Signal parameters
- LIN frame name: Battery Sensor (BS_signal) — data length typically up to 8 bytes
- Expected frame period: nominal LIN master polling period (commonly tens to hundreds of ms depending on system)
- Timeout threshold: fault logged when expected frame(s) are not received within defined timeout window (commonly 2–5 polling cycles)
- Key data bytes: battery voltage, pack current, state-of-charge (SOC), temperature, status/flags byte (checksum or error flags)
- Physical: LIN bus idle voltage ~12 V supply referenced through pull-up (actual idle voltage depends on local LIN transceiver design)
- Signal quality: no dominant low stuck or continuous noise; clear single-ended transitions when frames are transmitted
Diagnostic algorithm
- Connect a diagnostic tool and capture live datastreams and DTC occurrence history. Note other active communication codes.
- Attempt to reproduce problem (key on, start/stop, drive cycle) while watching the BS_signal frame and related parameters.
- Visually inspect and repair any damaged connectors, terminal corrosion or poorly crimped wires at the battery sensor and ECU/EBS connectors.
- Measure battery voltage and ground integrity; repair any low or unstable supply before further LIN checks.
- Backprobe LIN line at sensor and at master node; use an oscilloscope or logic analyzer to confirm frame timing, amplitude and absence of noise. Look for missing frames or CRC/frame errors.
- Perform wiggle and load tests on wiring while monitoring messages to isolate intermittent faults.
- If wiring and power are good, swap in a known-good battery sensor module (or substitute known-good module if available) and verify if DTC clears.
- Check for and apply ECU/EBS/battery sensor software updates per service information; clear codes and retest multiple cycles.
- If fault persists after wiring, power and software verified, follow manufacturer procedures to test/replace ECU or EBS module as required.
- After repair, clear codes and perform extended verification drive to ensure no reoccurrence.
Likely causes
- Intermittent/failed connector or damaged wiring on LIN line to battery sensor
- Faulty battery sensor module
- Low battery voltage or charging system issue affecting communications
Fault status
Status
LIN message timeout / BS_signal frame error — ECU not receiving valid battery sensor data (communication lost or corrupted).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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Send to email
Code
U1111
Other
U — Network/User
SCP (J1850) Invalid or Missing Data for Primary Id
Views:
UK: 21
EN: 29
RU: 17
AI status
Completed
Completed
100%
Causes
- Faulty battery sensor (battery monitoring unit) or internal electronics
- Open, short, high resistance or intermittent connection on LIN bus wiring or sensor connector
- Corroded or damaged ground or battery connections
- Low system voltage or unstable battery/charging system
- Faulty ECU, EBS module or LIN master node
- Software/firmware mismatch or known communications bug
Symptoms
- Battery/BMS warning lamp or message on instrument cluster
- Stored U1111 and possibly related communication or battery codes
- Battery state-of-charge, current or temperature not displayed or incorrect
- Reduced charging control or limp charging strategy
- Hard or no-start intermittently if battery monitoring is required for start logic
- Brake/EBS-related warnings if EBS depends on battery sensor data
What to check
- Read DTCs and freeze frame data with a capable diagnostic tool; record occurrence frequency and associated codes
- Visually inspect battery sensor connector, LIN wiring, harness for corrosion, damage, pin push-out or water intrusion
- Check battery voltage at rest and cranking; verify charging system voltage with engine running
- Check fuses and relays for BMS, ECU and LIN bus power circuits
- Use a scope or multimeter to monitor LIN line for expected idle voltage and communication pulses while cranking and running
- Wiggle-test connectors and wiring while monitoring live LIN frames to reproduce intermittent faults
Signal parameters
- LIN frame name: Battery Sensor (BS_signal) — data length typically up to 8 bytes
- Expected frame period: nominal LIN master polling period (commonly tens to hundreds of ms depending on system)
- Timeout threshold: fault logged when expected frame(s) are not received within defined timeout window (commonly 2–5 polling cycles)
- Key data bytes: battery voltage, pack current, state-of-charge (SOC), temperature, status/flags byte (checksum or error flags)
- Physical: LIN bus idle voltage ~12 V supply referenced through pull-up (actual idle voltage depends on local LIN transceiver design)
- Signal quality: no dominant low stuck or continuous noise; clear single-ended transitions when frames are transmitted
Diagnostic algorithm
- Connect a diagnostic tool and capture live datastreams and DTC occurrence history. Note other active communication codes.
- Attempt to reproduce problem (key on, start/stop, drive cycle) while watching the BS_signal frame and related parameters.
- Visually inspect and repair any damaged connectors, terminal corrosion or poorly crimped wires at the battery sensor and ECU/EBS connectors.
- Measure battery voltage and ground integrity; repair any low or unstable supply before further LIN checks.
- Backprobe LIN line at sensor and at master node; use an oscilloscope or logic analyzer to confirm frame timing, amplitude and absence of noise. Look for missing frames or CRC/frame errors.
- Perform wiggle and load tests on wiring while monitoring messages to isolate intermittent faults.
- If wiring and power are good, swap in a known-good battery sensor module (or substitute known-good module if available) and verify if DTC clears.
- Check for and apply ECU/EBS/battery sensor software updates per service information; clear codes and retest multiple cycles.
- If fault persists after wiring, power and software verified, follow manufacturer procedures to test/replace ECU or EBS module as required.
- After repair, clear codes and perform extended verification drive to ensure no reoccurrence.
Likely causes
- Intermittent/failed connector or damaged wiring on LIN line to battery sensor
- Faulty battery sensor module
- Low battery voltage or charging system issue affecting communications
Fault status
Status
LIN message timeout / BS_signal frame error — ECU not receiving valid battery sensor data (communication lost or corrupted).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email