Code
U0001
AUDI
U — Network/User
A faulty wheel speed sensor, A problem with the wheel speed sensor circuit, Reluctor issues, A problem with the ABS module
Views:
UK: 32
EN: 71
RU: 88
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed sensor (passive or active)
- Open/short or intermittent wiring in the wheel speed sensor circuit
- Corroded or poor connector contact at sensor or ABS module
- Damaged or missing teeth on the reluctor (tone) ring
- Poor ground or supply voltage to sensor or ABS module
- ABS control module fault or internal connector failure
Symptoms
- Illumination of ABS warning light and/or traction control light
- Loss or erratic wheel speed readings in live data (one wheel showing 0 or unrealistic values)
- Intermittent ABS or traction intervention during normal driving
- Vehicle speed signal issues (cruise/gearbox behaviors)
- Diagnostic trouble codes related to wheel speed sensors, ABS, or network communication
What to check
- Read and record all stored and pending codes with a professional scan tool; note freeze frame and related U/C or C codes
- Check live data for wheel speed sensor values at each wheel (static and while rotating wheels)
- Visually inspect wheel speed sensor and connector for damage, corrosion, contamination, or loose mounting
- Inspect the reluctor/tone ring for missing/broken teeth, rust build-up, or physical damage
- Wiggle harness and connector while monitoring live data to reproduce intermittent faults
- Check ABS module connector for corrosion, bent pins, and secure mating; verify module power and ground
Signal parameters
- Passive reluctor (VR) sensor: produces AC sine waveform; amplitude increases with wheel speed (commonly millivolt to volt range) — exact amplitudes vary by vehicle; measure with an oscilloscope while spinning the wheel
- Active (Hall/active) sensor: typically a square wave referenced between 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed; present only when sensor supply (pull-up) is available
- Typical resistance: varies by sensor type and OEM — consult Audi factory data. If measuring resistance, compare to spec or to the opposite wheel sensor
- Frequency: wheel speed pulse frequency is proportional to road speed; expect frequency to rise smoothly as wheel speed increases (no dropouts)
- CAN/Bus signals (if relevant): differential CAN bus voltage ~2.5 V idle, with valid differential waveform on oscilloscope; network errors or bus-off conditions indicate higher-level communication issues
Diagnostic algorithm
- Connect a capable diagnostic scanner and record all codes and live wheel speed values for each corner. Note any network/U codes. 2) Perform a careful visual inspection of the suspect wheel sensor, harness, and reluctor ring; repair obvious damage. 3) With the wheel off the ground, spin the wheel by hand or use a road test and monitor the sensor waveform: use an oscilloscope for best results. 4) For passive sensors: measure AC voltage while spinning and check sensor resistance to specification. For active sensors: verify supply/pull-up voltage to the sensor and measure output square wave. 5) Back-probe the sensor connector while operating and wiggle the harness to reveal intermittent faults. 6) Check continuity between the sensor connector and the ABS module pins; check for short to ground or battery. 7) Inspect and test ABS module power and ground circuits; verify module connector pins for corrosion or damage. 8) Inspect the reluctor ring for missing or damaged teeth; replace or repair if geometry is off. 9) If wiring, connector, sensor, and reluctor are good, check CAN bus integrity and module communication; perform a module self-test and software update if available. 10) If available, swap in a known-good sensor or ABS module as a controlled test. Clear codes and retest to confirm repair.
- similar_codes([
Likely causes
- Damaged wheel speed sensor at one wheel (contamination, impact)
- Broken or chafed harness near suspension or steering knuckle
- Reluctor ring bent, cracked, missing teeth, or magnetic contamination
- Corroded connector pins causing intermittent contact
- ABS module supply/ground issue or module internal fault
Fault status
Status
U0001 indicates loss or corruption of wheel speed/ABS-related data on the vehicle communication network. It is a network-level indication that wheel speed information is missing, invalid, or not being received by the ABS/traction systems. Further component-level testing (sensors, wiring, reluctor, module, CAN bus) is required to identify the specific faulty item.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Workshop Manuals
Repair manuals for 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 ManualYour experience will help others
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Code
U0001
Generic
U — Network/User
High Speed CAN Communication Bus
Views:
UK: 26
EN: 54
RU: 75
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed sensor (passive or active)
- Open/short or intermittent wiring in the wheel speed sensor circuit
- Corroded or poor connector contact at sensor or ABS module
- Damaged or missing teeth on the reluctor (tone) ring
- Poor ground or supply voltage to sensor or ABS module
- ABS control module fault or internal connector failure
Symptoms
- Illumination of ABS warning light and/or traction control light
- Loss or erratic wheel speed readings in live data (one wheel showing 0 or unrealistic values)
- Intermittent ABS or traction intervention during normal driving
- Vehicle speed signal issues (cruise/gearbox behaviors)
- Diagnostic trouble codes related to wheel speed sensors, ABS, or network communication
What to check
- Read and record all stored and pending codes with a professional scan tool; note freeze frame and related U/C or C codes
- Check live data for wheel speed sensor values at each wheel (static and while rotating wheels)
- Visually inspect wheel speed sensor and connector for damage, corrosion, contamination, or loose mounting
- Inspect the reluctor/tone ring for missing/broken teeth, rust build-up, or physical damage
- Wiggle harness and connector while monitoring live data to reproduce intermittent faults
- Check ABS module connector for corrosion, bent pins, and secure mating; verify module power and ground
Signal parameters
- Passive reluctor (VR) sensor: produces AC sine waveform; amplitude increases with wheel speed (commonly millivolt to volt range) — exact amplitudes vary by vehicle; measure with an oscilloscope while spinning the wheel
- Active (Hall/active) sensor: typically a square wave referenced between 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed; present only when sensor supply (pull-up) is available
- Typical resistance: varies by sensor type and OEM — consult Audi factory data. If measuring resistance, compare to spec or to the opposite wheel sensor
- Frequency: wheel speed pulse frequency is proportional to road speed; expect frequency to rise smoothly as wheel speed increases (no dropouts)
- CAN/Bus signals (if relevant): differential CAN bus voltage ~2.5 V idle, with valid differential waveform on oscilloscope; network errors or bus-off conditions indicate higher-level communication issues
Diagnostic algorithm
- Connect a capable diagnostic scanner and record all codes and live wheel speed values for each corner. Note any network/U codes. 2) Perform a careful visual inspection of the suspect wheel sensor, harness, and reluctor ring; repair obvious damage. 3) With the wheel off the ground, spin the wheel by hand or use a road test and monitor the sensor waveform: use an oscilloscope for best results. 4) For passive sensors: measure AC voltage while spinning and check sensor resistance to specification. For active sensors: verify supply/pull-up voltage to the sensor and measure output square wave. 5) Back-probe the sensor connector while operating and wiggle the harness to reveal intermittent faults. 6) Check continuity between the sensor connector and the ABS module pins; check for short to ground or battery. 7) Inspect and test ABS module power and ground circuits; verify module connector pins for corrosion or damage. 8) Inspect the reluctor ring for missing or damaged teeth; replace or repair if geometry is off. 9) If wiring, connector, sensor, and reluctor are good, check CAN bus integrity and module communication; perform a module self-test and software update if available. 10) If available, swap in a known-good sensor or ABS module as a controlled test. Clear codes and retest to confirm repair.
- similar_codes([
Likely causes
- Damaged wheel speed sensor at one wheel (contamination, impact)
- Broken or chafed harness near suspension or steering knuckle
- Reluctor ring bent, cracked, missing teeth, or magnetic contamination
- Corroded connector pins causing intermittent contact
- ABS module supply/ground issue or module internal fault
Fault status
Status
U0001 indicates loss or corruption of wheel speed/ABS-related data on the vehicle communication network. It is a network-level indication that wheel speed information is missing, invalid, or not being received by the ABS/traction systems. Further component-level testing (sensors, wiring, reluctor, module, CAN bus) is required to identify the specific faulty item.
Repair difficulty: Medium
Diagnostic time: 1-3 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
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Code
U0001
HUMMER
U — Network/User
Controller Area Network (CAN) Bus Communication (ECM)
Views:
UK: 12
EN: 20
RU: 54
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed sensor (passive or active)
- Open/short or intermittent wiring in the wheel speed sensor circuit
- Corroded or poor connector contact at sensor or ABS module
- Damaged or missing teeth on the reluctor (tone) ring
- Poor ground or supply voltage to sensor or ABS module
- ABS control module fault or internal connector failure
Symptoms
- Illumination of ABS warning light and/or traction control light
- Loss or erratic wheel speed readings in live data (one wheel showing 0 or unrealistic values)
- Intermittent ABS or traction intervention during normal driving
- Vehicle speed signal issues (cruise/gearbox behaviors)
- Diagnostic trouble codes related to wheel speed sensors, ABS, or network communication
What to check
- Read and record all stored and pending codes with a professional scan tool; note freeze frame and related U/C or C codes
- Check live data for wheel speed sensor values at each wheel (static and while rotating wheels)
- Visually inspect wheel speed sensor and connector for damage, corrosion, contamination, or loose mounting
- Inspect the reluctor/tone ring for missing/broken teeth, rust build-up, or physical damage
- Wiggle harness and connector while monitoring live data to reproduce intermittent faults
- Check ABS module connector for corrosion, bent pins, and secure mating; verify module power and ground
Signal parameters
- Passive reluctor (VR) sensor: produces AC sine waveform; amplitude increases with wheel speed (commonly millivolt to volt range) — exact amplitudes vary by vehicle; measure with an oscilloscope while spinning the wheel
- Active (Hall/active) sensor: typically a square wave referenced between 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed; present only when sensor supply (pull-up) is available
- Typical resistance: varies by sensor type and OEM — consult Audi factory data. If measuring resistance, compare to spec or to the opposite wheel sensor
- Frequency: wheel speed pulse frequency is proportional to road speed; expect frequency to rise smoothly as wheel speed increases (no dropouts)
- CAN/Bus signals (if relevant): differential CAN bus voltage ~2.5 V idle, with valid differential waveform on oscilloscope; network errors or bus-off conditions indicate higher-level communication issues
Diagnostic algorithm
- Connect a capable diagnostic scanner and record all codes and live wheel speed values for each corner. Note any network/U codes. 2) Perform a careful visual inspection of the suspect wheel sensor, harness, and reluctor ring; repair obvious damage. 3) With the wheel off the ground, spin the wheel by hand or use a road test and monitor the sensor waveform: use an oscilloscope for best results. 4) For passive sensors: measure AC voltage while spinning and check sensor resistance to specification. For active sensors: verify supply/pull-up voltage to the sensor and measure output square wave. 5) Back-probe the sensor connector while operating and wiggle the harness to reveal intermittent faults. 6) Check continuity between the sensor connector and the ABS module pins; check for short to ground or battery. 7) Inspect and test ABS module power and ground circuits; verify module connector pins for corrosion or damage. 8) Inspect the reluctor ring for missing or damaged teeth; replace or repair if geometry is off. 9) If wiring, connector, sensor, and reluctor are good, check CAN bus integrity and module communication; perform a module self-test and software update if available. 10) If available, swap in a known-good sensor or ABS module as a controlled test. Clear codes and retest to confirm repair.
- similar_codes([
Likely causes
- Damaged wheel speed sensor at one wheel (contamination, impact)
- Broken or chafed harness near suspension or steering knuckle
- Reluctor ring bent, cracked, missing teeth, or magnetic contamination
- Corroded connector pins causing intermittent contact
- ABS module supply/ground issue or module internal fault
Fault status
Status
U0001 indicates loss or corruption of wheel speed/ABS-related data on the vehicle communication network. It is a network-level indication that wheel speed information is missing, invalid, or not being received by the ABS/traction systems. Further component-level testing (sensors, wiring, reluctor, module, CAN bus) is required to identify the specific faulty item.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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Code
U0001
HYUNDAI
U — Network/User
High Speed CAN Communication Bus | CAN Bus OFF | TCU Communication Line or TCU Error | CAN Communication Malfunction | CAN Communication Bus Off | CAN BUS OFF | High Speed CAN Communication Bus off (C-CAN) | High Speed CAN Communication Bus (C-CAN)
Views:
UK: 15
EN: 34
RU: 60
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed sensor (passive or active)
- Open/short or intermittent wiring in the wheel speed sensor circuit
- Corroded or poor connector contact at sensor or ABS module
- Damaged or missing teeth on the reluctor (tone) ring
- Poor ground or supply voltage to sensor or ABS module
- ABS control module fault or internal connector failure
Symptoms
- Illumination of ABS warning light and/or traction control light
- Loss or erratic wheel speed readings in live data (one wheel showing 0 or unrealistic values)
- Intermittent ABS or traction intervention during normal driving
- Vehicle speed signal issues (cruise/gearbox behaviors)
- Diagnostic trouble codes related to wheel speed sensors, ABS, or network communication
What to check
- Read and record all stored and pending codes with a professional scan tool; note freeze frame and related U/C or C codes
- Check live data for wheel speed sensor values at each wheel (static and while rotating wheels)
- Visually inspect wheel speed sensor and connector for damage, corrosion, contamination, or loose mounting
- Inspect the reluctor/tone ring for missing/broken teeth, rust build-up, or physical damage
- Wiggle harness and connector while monitoring live data to reproduce intermittent faults
- Check ABS module connector for corrosion, bent pins, and secure mating; verify module power and ground
Signal parameters
- Passive reluctor (VR) sensor: produces AC sine waveform; amplitude increases with wheel speed (commonly millivolt to volt range) — exact amplitudes vary by vehicle; measure with an oscilloscope while spinning the wheel
- Active (Hall/active) sensor: typically a square wave referenced between 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed; present only when sensor supply (pull-up) is available
- Typical resistance: varies by sensor type and OEM — consult Audi factory data. If measuring resistance, compare to spec or to the opposite wheel sensor
- Frequency: wheel speed pulse frequency is proportional to road speed; expect frequency to rise smoothly as wheel speed increases (no dropouts)
- CAN/Bus signals (if relevant): differential CAN bus voltage ~2.5 V idle, with valid differential waveform on oscilloscope; network errors or bus-off conditions indicate higher-level communication issues
Diagnostic algorithm
- Connect a capable diagnostic scanner and record all codes and live wheel speed values for each corner. Note any network/U codes. 2) Perform a careful visual inspection of the suspect wheel sensor, harness, and reluctor ring; repair obvious damage. 3) With the wheel off the ground, spin the wheel by hand or use a road test and monitor the sensor waveform: use an oscilloscope for best results. 4) For passive sensors: measure AC voltage while spinning and check sensor resistance to specification. For active sensors: verify supply/pull-up voltage to the sensor and measure output square wave. 5) Back-probe the sensor connector while operating and wiggle the harness to reveal intermittent faults. 6) Check continuity between the sensor connector and the ABS module pins; check for short to ground or battery. 7) Inspect and test ABS module power and ground circuits; verify module connector pins for corrosion or damage. 8) Inspect the reluctor ring for missing or damaged teeth; replace or repair if geometry is off. 9) If wiring, connector, sensor, and reluctor are good, check CAN bus integrity and module communication; perform a module self-test and software update if available. 10) If available, swap in a known-good sensor or ABS module as a controlled test. Clear codes and retest to confirm repair.
- similar_codes([
Likely causes
- Damaged wheel speed sensor at one wheel (contamination, impact)
- Broken or chafed harness near suspension or steering knuckle
- Reluctor ring bent, cracked, missing teeth, or magnetic contamination
- Corroded connector pins causing intermittent contact
- ABS module supply/ground issue or module internal fault
Fault status
Status
U0001 indicates loss or corruption of wheel speed/ABS-related data on the vehicle communication network. It is a network-level indication that wheel speed information is missing, invalid, or not being received by the ABS/traction systems. Further component-level testing (sensors, wiring, reluctor, module, CAN bus) is required to identify the specific faulty item.
Repair difficulty: Medium
Diagnostic time: 1-3 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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0
Send to email
Code
U0001
ISUZU
U — Network/User
CAN-Bus Malfunction.15E-92
Views:
UK: 35
EN: 55
RU: 77
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed sensor (passive or active)
- Open/short or intermittent wiring in the wheel speed sensor circuit
- Corroded or poor connector contact at sensor or ABS module
- Damaged or missing teeth on the reluctor (tone) ring
- Poor ground or supply voltage to sensor or ABS module
- ABS control module fault or internal connector failure
Symptoms
- Illumination of ABS warning light and/or traction control light
- Loss or erratic wheel speed readings in live data (one wheel showing 0 or unrealistic values)
- Intermittent ABS or traction intervention during normal driving
- Vehicle speed signal issues (cruise/gearbox behaviors)
- Diagnostic trouble codes related to wheel speed sensors, ABS, or network communication
What to check
- Read and record all stored and pending codes with a professional scan tool; note freeze frame and related U/C or C codes
- Check live data for wheel speed sensor values at each wheel (static and while rotating wheels)
- Visually inspect wheel speed sensor and connector for damage, corrosion, contamination, or loose mounting
- Inspect the reluctor/tone ring for missing/broken teeth, rust build-up, or physical damage
- Wiggle harness and connector while monitoring live data to reproduce intermittent faults
- Check ABS module connector for corrosion, bent pins, and secure mating; verify module power and ground
Signal parameters
- Passive reluctor (VR) sensor: produces AC sine waveform; amplitude increases with wheel speed (commonly millivolt to volt range) — exact amplitudes vary by vehicle; measure with an oscilloscope while spinning the wheel
- Active (Hall/active) sensor: typically a square wave referenced between 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed; present only when sensor supply (pull-up) is available
- Typical resistance: varies by sensor type and OEM — consult Audi factory data. If measuring resistance, compare to spec or to the opposite wheel sensor
- Frequency: wheel speed pulse frequency is proportional to road speed; expect frequency to rise smoothly as wheel speed increases (no dropouts)
- CAN/Bus signals (if relevant): differential CAN bus voltage ~2.5 V idle, with valid differential waveform on oscilloscope; network errors or bus-off conditions indicate higher-level communication issues
Diagnostic algorithm
- Connect a capable diagnostic scanner and record all codes and live wheel speed values for each corner. Note any network/U codes. 2) Perform a careful visual inspection of the suspect wheel sensor, harness, and reluctor ring; repair obvious damage. 3) With the wheel off the ground, spin the wheel by hand or use a road test and monitor the sensor waveform: use an oscilloscope for best results. 4) For passive sensors: measure AC voltage while spinning and check sensor resistance to specification. For active sensors: verify supply/pull-up voltage to the sensor and measure output square wave. 5) Back-probe the sensor connector while operating and wiggle the harness to reveal intermittent faults. 6) Check continuity between the sensor connector and the ABS module pins; check for short to ground or battery. 7) Inspect and test ABS module power and ground circuits; verify module connector pins for corrosion or damage. 8) Inspect the reluctor ring for missing or damaged teeth; replace or repair if geometry is off. 9) If wiring, connector, sensor, and reluctor are good, check CAN bus integrity and module communication; perform a module self-test and software update if available. 10) If available, swap in a known-good sensor or ABS module as a controlled test. Clear codes and retest to confirm repair.
- similar_codes([
Likely causes
- Damaged wheel speed sensor at one wheel (contamination, impact)
- Broken or chafed harness near suspension or steering knuckle
- Reluctor ring bent, cracked, missing teeth, or magnetic contamination
- Corroded connector pins causing intermittent contact
- ABS module supply/ground issue or module internal fault
Fault status
Status
U0001 indicates loss or corruption of wheel speed/ABS-related data on the vehicle communication network. It is a network-level indication that wheel speed information is missing, invalid, or not being received by the ABS/traction systems. Further component-level testing (sensors, wiring, reluctor, module, CAN bus) is required to identify the specific faulty item.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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Send to email
Code
U0001
LAND ROVER
U — Network/User
CAN bus communication of high speed
Views:
UK: 5
EN: 19
RU: 38
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed sensor (passive or active)
- Open/short or intermittent wiring in the wheel speed sensor circuit
- Corroded or poor connector contact at sensor or ABS module
- Damaged or missing teeth on the reluctor (tone) ring
- Poor ground or supply voltage to sensor or ABS module
- ABS control module fault or internal connector failure
Symptoms
- Illumination of ABS warning light and/or traction control light
- Loss or erratic wheel speed readings in live data (one wheel showing 0 or unrealistic values)
- Intermittent ABS or traction intervention during normal driving
- Vehicle speed signal issues (cruise/gearbox behaviors)
- Diagnostic trouble codes related to wheel speed sensors, ABS, or network communication
What to check
- Read and record all stored and pending codes with a professional scan tool; note freeze frame and related U/C or C codes
- Check live data for wheel speed sensor values at each wheel (static and while rotating wheels)
- Visually inspect wheel speed sensor and connector for damage, corrosion, contamination, or loose mounting
- Inspect the reluctor/tone ring for missing/broken teeth, rust build-up, or physical damage
- Wiggle harness and connector while monitoring live data to reproduce intermittent faults
- Check ABS module connector for corrosion, bent pins, and secure mating; verify module power and ground
Signal parameters
- Passive reluctor (VR) sensor: produces AC sine waveform; amplitude increases with wheel speed (commonly millivolt to volt range) — exact amplitudes vary by vehicle; measure with an oscilloscope while spinning the wheel
- Active (Hall/active) sensor: typically a square wave referenced between 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed; present only when sensor supply (pull-up) is available
- Typical resistance: varies by sensor type and OEM — consult Audi factory data. If measuring resistance, compare to spec or to the opposite wheel sensor
- Frequency: wheel speed pulse frequency is proportional to road speed; expect frequency to rise smoothly as wheel speed increases (no dropouts)
- CAN/Bus signals (if relevant): differential CAN bus voltage ~2.5 V idle, with valid differential waveform on oscilloscope; network errors or bus-off conditions indicate higher-level communication issues
Diagnostic algorithm
- Connect a capable diagnostic scanner and record all codes and live wheel speed values for each corner. Note any network/U codes. 2) Perform a careful visual inspection of the suspect wheel sensor, harness, and reluctor ring; repair obvious damage. 3) With the wheel off the ground, spin the wheel by hand or use a road test and monitor the sensor waveform: use an oscilloscope for best results. 4) For passive sensors: measure AC voltage while spinning and check sensor resistance to specification. For active sensors: verify supply/pull-up voltage to the sensor and measure output square wave. 5) Back-probe the sensor connector while operating and wiggle the harness to reveal intermittent faults. 6) Check continuity between the sensor connector and the ABS module pins; check for short to ground or battery. 7) Inspect and test ABS module power and ground circuits; verify module connector pins for corrosion or damage. 8) Inspect the reluctor ring for missing or damaged teeth; replace or repair if geometry is off. 9) If wiring, connector, sensor, and reluctor are good, check CAN bus integrity and module communication; perform a module self-test and software update if available. 10) If available, swap in a known-good sensor or ABS module as a controlled test. Clear codes and retest to confirm repair.
- similar_codes([
Likely causes
- Damaged wheel speed sensor at one wheel (contamination, impact)
- Broken or chafed harness near suspension or steering knuckle
- Reluctor ring bent, cracked, missing teeth, or magnetic contamination
- Corroded connector pins causing intermittent contact
- ABS module supply/ground issue or module internal fault
Fault status
Status
U0001 indicates loss or corruption of wheel speed/ABS-related data on the vehicle communication network. It is a network-level indication that wheel speed information is missing, invalid, or not being received by the ABS/traction systems. Further component-level testing (sensors, wiring, reluctor, module, CAN bus) is required to identify the specific faulty item.
Repair difficulty: Medium
Diagnostic time: 1-3 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
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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Send to email
Code
U0001
MERCEDES-BENZ
U — Network/User
High Speed CAN Communication Bus
Views:
UK: 21
EN: 44
RU: 68
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed sensor (passive or active)
- Open/short or intermittent wiring in the wheel speed sensor circuit
- Corroded or poor connector contact at sensor or ABS module
- Damaged or missing teeth on the reluctor (tone) ring
- Poor ground or supply voltage to sensor or ABS module
- ABS control module fault or internal connector failure
Symptoms
- Illumination of ABS warning light and/or traction control light
- Loss or erratic wheel speed readings in live data (one wheel showing 0 or unrealistic values)
- Intermittent ABS or traction intervention during normal driving
- Vehicle speed signal issues (cruise/gearbox behaviors)
- Diagnostic trouble codes related to wheel speed sensors, ABS, or network communication
What to check
- Read and record all stored and pending codes with a professional scan tool; note freeze frame and related U/C or C codes
- Check live data for wheel speed sensor values at each wheel (static and while rotating wheels)
- Visually inspect wheel speed sensor and connector for damage, corrosion, contamination, or loose mounting
- Inspect the reluctor/tone ring for missing/broken teeth, rust build-up, or physical damage
- Wiggle harness and connector while monitoring live data to reproduce intermittent faults
- Check ABS module connector for corrosion, bent pins, and secure mating; verify module power and ground
Signal parameters
- Passive reluctor (VR) sensor: produces AC sine waveform; amplitude increases with wheel speed (commonly millivolt to volt range) — exact amplitudes vary by vehicle; measure with an oscilloscope while spinning the wheel
- Active (Hall/active) sensor: typically a square wave referenced between 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed; present only when sensor supply (pull-up) is available
- Typical resistance: varies by sensor type and OEM — consult Audi factory data. If measuring resistance, compare to spec or to the opposite wheel sensor
- Frequency: wheel speed pulse frequency is proportional to road speed; expect frequency to rise smoothly as wheel speed increases (no dropouts)
- CAN/Bus signals (if relevant): differential CAN bus voltage ~2.5 V idle, with valid differential waveform on oscilloscope; network errors or bus-off conditions indicate higher-level communication issues
Diagnostic algorithm
- Connect a capable diagnostic scanner and record all codes and live wheel speed values for each corner. Note any network/U codes. 2) Perform a careful visual inspection of the suspect wheel sensor, harness, and reluctor ring; repair obvious damage. 3) With the wheel off the ground, spin the wheel by hand or use a road test and monitor the sensor waveform: use an oscilloscope for best results. 4) For passive sensors: measure AC voltage while spinning and check sensor resistance to specification. For active sensors: verify supply/pull-up voltage to the sensor and measure output square wave. 5) Back-probe the sensor connector while operating and wiggle the harness to reveal intermittent faults. 6) Check continuity between the sensor connector and the ABS module pins; check for short to ground or battery. 7) Inspect and test ABS module power and ground circuits; verify module connector pins for corrosion or damage. 8) Inspect the reluctor ring for missing or damaged teeth; replace or repair if geometry is off. 9) If wiring, connector, sensor, and reluctor are good, check CAN bus integrity and module communication; perform a module self-test and software update if available. 10) If available, swap in a known-good sensor or ABS module as a controlled test. Clear codes and retest to confirm repair.
- similar_codes([
Likely causes
- Damaged wheel speed sensor at one wheel (contamination, impact)
- Broken or chafed harness near suspension or steering knuckle
- Reluctor ring bent, cracked, missing teeth, or magnetic contamination
- Corroded connector pins causing intermittent contact
- ABS module supply/ground issue or module internal fault
Fault status
Status
U0001 indicates loss or corruption of wheel speed/ABS-related data on the vehicle communication network. It is a network-level indication that wheel speed information is missing, invalid, or not being received by the ABS/traction systems. Further component-level testing (sensors, wiring, reluctor, module, CAN bus) is required to identify the specific faulty item.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
U0001
OPEL
U — Network/User
CAN-Bus Maximum Configuration List not Programmed
Views:
UK: 3
EN: 5
RU: 26
AI status
Completed
Completed
100%
Causes
- Faulty wheel speed sensor (passive or active)
- Open/short or intermittent wiring in the wheel speed sensor circuit
- Corroded or poor connector contact at sensor or ABS module
- Damaged or missing teeth on the reluctor (tone) ring
- Poor ground or supply voltage to sensor or ABS module
- ABS control module fault or internal connector failure
Symptoms
- Illumination of ABS warning light and/or traction control light
- Loss or erratic wheel speed readings in live data (one wheel showing 0 or unrealistic values)
- Intermittent ABS or traction intervention during normal driving
- Vehicle speed signal issues (cruise/gearbox behaviors)
- Diagnostic trouble codes related to wheel speed sensors, ABS, or network communication
What to check
- Read and record all stored and pending codes with a professional scan tool; note freeze frame and related U/C or C codes
- Check live data for wheel speed sensor values at each wheel (static and while rotating wheels)
- Visually inspect wheel speed sensor and connector for damage, corrosion, contamination, or loose mounting
- Inspect the reluctor/tone ring for missing/broken teeth, rust build-up, or physical damage
- Wiggle harness and connector while monitoring live data to reproduce intermittent faults
- Check ABS module connector for corrosion, bent pins, and secure mating; verify module power and ground
Signal parameters
- Passive reluctor (VR) sensor: produces AC sine waveform; amplitude increases with wheel speed (commonly millivolt to volt range) — exact amplitudes vary by vehicle; measure with an oscilloscope while spinning the wheel
- Active (Hall/active) sensor: typically a square wave referenced between 0–5 V (or 0–12 V on some systems) with frequency proportional to wheel speed; present only when sensor supply (pull-up) is available
- Typical resistance: varies by sensor type and OEM — consult Audi factory data. If measuring resistance, compare to spec or to the opposite wheel sensor
- Frequency: wheel speed pulse frequency is proportional to road speed; expect frequency to rise smoothly as wheel speed increases (no dropouts)
- CAN/Bus signals (if relevant): differential CAN bus voltage ~2.5 V idle, with valid differential waveform on oscilloscope; network errors or bus-off conditions indicate higher-level communication issues
Diagnostic algorithm
- Connect a capable diagnostic scanner and record all codes and live wheel speed values for each corner. Note any network/U codes. 2) Perform a careful visual inspection of the suspect wheel sensor, harness, and reluctor ring; repair obvious damage. 3) With the wheel off the ground, spin the wheel by hand or use a road test and monitor the sensor waveform: use an oscilloscope for best results. 4) For passive sensors: measure AC voltage while spinning and check sensor resistance to specification. For active sensors: verify supply/pull-up voltage to the sensor and measure output square wave. 5) Back-probe the sensor connector while operating and wiggle the harness to reveal intermittent faults. 6) Check continuity between the sensor connector and the ABS module pins; check for short to ground or battery. 7) Inspect and test ABS module power and ground circuits; verify module connector pins for corrosion or damage. 8) Inspect the reluctor ring for missing or damaged teeth; replace or repair if geometry is off. 9) If wiring, connector, sensor, and reluctor are good, check CAN bus integrity and module communication; perform a module self-test and software update if available. 10) If available, swap in a known-good sensor or ABS module as a controlled test. Clear codes and retest to confirm repair.
- similar_codes([
Likely causes
- Damaged wheel speed sensor at one wheel (contamination, impact)
- Broken or chafed harness near suspension or steering knuckle
- Reluctor ring bent, cracked, missing teeth, or magnetic contamination
- Corroded connector pins causing intermittent contact
- ABS module supply/ground issue or module internal fault
Fault status
Status
U0001 indicates loss or corruption of wheel speed/ABS-related data on the vehicle communication network. It is a network-level indication that wheel speed information is missing, invalid, or not being received by the ABS/traction systems. Further component-level testing (sensors, wiring, reluctor, module, CAN bus) is required to identify the specific faulty item.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
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