Code
U1500
Generic
U — Network/User
Control Module Communication Bus Malfunction
AI status
Completed
Completed
100%
Causes
- Open or short in communication bus wiring (CAN H/CAN L or single-wire bus)
- Failed or intermittent control module(s)
- Poor battery supply or weak/poor ground connections
- Missing or damaged termination resistor(s)
- Water intrusion, corrosion, or damaged connectors on the bus
- Aftermarket device or improperly installed module interfering with bus
Symptoms
- Malfunction indicator lamp or multiple warning lights illuminated
- Loss of specific subsystem functions controlled by one or more modules (e.g., ABS, steering, instrument cluster)
- Unable to communicate with one or more modules using a scan tool
- Intermittent faults that appear/disappear with vibration or moisture
- Modules show as ‘bus off’ or ‘no response’ in diagnostics
What to check
- Read all U‑codes and freeze frame data with a capable scan tool; record which modules are not responding
- Check battery voltage (key on and cranking); ensure >12V at the beginning of diagnosis
- Visually inspect connectors, grounds, and wiring along the bus for corrosion, breaks, or pinch points
- Check for aftermarket modules/devices connected to the bus and disconnect if present
- Measure termination resistance between CAN_H and CAN_L with ignition off (expected ≈60Ω for CAN)
- Backprobe CAN_H and CAN_L with a multimeter and/or oscilloscope to observe idle and active voltages
Signal parameters
- CAN bus idle: CAN_H ≈2.5V, CAN_L ≈2.5V (difference ≈0V)
- CAN dominant: CAN_H ≈3.5V, CAN_L ≈1.5V (difference ≈2V)
- Typical CAN termination: two 120Ω resistors in parallel → ≈60Ω measured between CAN_H and CAN_L (key off)
- Common CAN data rates: 125 kbps, 250 kbps, 500 kbps, 1 Mbps — bus messages should match vehicle data rate
- LIN idle: single wire ≈12V (through pull-up); dominant ≈0V (varies by vehicle) — consult manufacturer spec for single-wire buses
- Check for voltage spikes or noise on bus lines during operation (oscilloscope)
Diagnostic algorithm
- Record all active and stored codes and note which modules are not responding to the diagnostic tool.
- Verify good battery voltage and solid engine/chassis grounds; charge battery if low and recheck communications.
- Perform a visual inspection of the entire communication bus: connectors, splices, modules, and any T‑tap or aftermarket connections. Repair visible damage.
- With ignition off, measure resistance between CAN_H and CAN_L at a central point; expect ≈60Ω. If open or very low, isolate wiring sections to find a short or open.
- With ignition on, backprobe CAN_H and CAN_L at several modules with a multimeter/oscilloscope. Confirm idle voltages ~2.5V and dominant swings when messages occur. If one node holds bus dominant or shows missing signals, suspect that module.
- Disconnect suspect modules one at a time (after checking service information) to see if bus communication returns; remove aftermarket devices first.
- Wiggle harnesses and connectors while monitoring communication for intermittent faults; inspect for moisture intrusion and re-test after drying if needed.
- If a failed module/transceiver is identified, replace or reprogram per manufacturer procedures. After repairs, clear codes and perform a road test and extended system verification.
- If diagnostics are inconclusive, use a capable scope and bus analyzer to capture and decode traffic, or consult wiring diagrams/gateway architecture for further isolation.
Likely causes
- Damaged connector or pin at a gateway/ECU
- Corroded CAN/LIN wiring harness splice or chafed wire shorting to ground
- One module pulling the bus dominant (shorted transceiver)
- Failed termination resistor (open or incorrect value)
- Low battery voltage or poor engine/chassis ground affecting module communication
Fault status
Status
Control module communication bus malfunction detected. One or more modules are not communicating properly on the vehicle data bus; check wiring, termination, and individual module transceivers.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
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Code
U1500
HUMMER
U — Network/User
Inter-Device Dedicated Bus Malfunction
AI status
Completed
Completed
100%
Causes
- Open or short in communication bus wiring (CAN H/CAN L or single-wire bus)
- Failed or intermittent control module(s)
- Poor battery supply or weak/poor ground connections
- Missing or damaged termination resistor(s)
- Water intrusion, corrosion, or damaged connectors on the bus
- Aftermarket device or improperly installed module interfering with bus
Symptoms
- Malfunction indicator lamp or multiple warning lights illuminated
- Loss of specific subsystem functions controlled by one or more modules (e.g., ABS, steering, instrument cluster)
- Unable to communicate with one or more modules using a scan tool
- Intermittent faults that appear/disappear with vibration or moisture
- Modules show as ‘bus off’ or ‘no response’ in diagnostics
What to check
- Read all U‑codes and freeze frame data with a capable scan tool; record which modules are not responding
- Check battery voltage (key on and cranking); ensure >12V at the beginning of diagnosis
- Visually inspect connectors, grounds, and wiring along the bus for corrosion, breaks, or pinch points
- Check for aftermarket modules/devices connected to the bus and disconnect if present
- Measure termination resistance between CAN_H and CAN_L with ignition off (expected ≈60Ω for CAN)
- Backprobe CAN_H and CAN_L with a multimeter and/or oscilloscope to observe idle and active voltages
Signal parameters
- CAN bus idle: CAN_H ≈2.5V, CAN_L ≈2.5V (difference ≈0V)
- CAN dominant: CAN_H ≈3.5V, CAN_L ≈1.5V (difference ≈2V)
- Typical CAN termination: two 120Ω resistors in parallel → ≈60Ω measured between CAN_H and CAN_L (key off)
- Common CAN data rates: 125 kbps, 250 kbps, 500 kbps, 1 Mbps — bus messages should match vehicle data rate
- LIN idle: single wire ≈12V (through pull-up); dominant ≈0V (varies by vehicle) — consult manufacturer spec for single-wire buses
- Check for voltage spikes or noise on bus lines during operation (oscilloscope)
Diagnostic algorithm
- Record all active and stored codes and note which modules are not responding to the diagnostic tool.
- Verify good battery voltage and solid engine/chassis grounds; charge battery if low and recheck communications.
- Perform a visual inspection of the entire communication bus: connectors, splices, modules, and any T‑tap or aftermarket connections. Repair visible damage.
- With ignition off, measure resistance between CAN_H and CAN_L at a central point; expect ≈60Ω. If open or very low, isolate wiring sections to find a short or open.
- With ignition on, backprobe CAN_H and CAN_L at several modules with a multimeter/oscilloscope. Confirm idle voltages ~2.5V and dominant swings when messages occur. If one node holds bus dominant or shows missing signals, suspect that module.
- Disconnect suspect modules one at a time (after checking service information) to see if bus communication returns; remove aftermarket devices first.
- Wiggle harnesses and connectors while monitoring communication for intermittent faults; inspect for moisture intrusion and re-test after drying if needed.
- If a failed module/transceiver is identified, replace or reprogram per manufacturer procedures. After repairs, clear codes and perform a road test and extended system verification.
- If diagnostics are inconclusive, use a capable scope and bus analyzer to capture and decode traffic, or consult wiring diagrams/gateway architecture for further isolation.
Likely causes
- Damaged connector or pin at a gateway/ECU
- Corroded CAN/LIN wiring harness splice or chafed wire shorting to ground
- One module pulling the bus dominant (shorted transceiver)
- Failed termination resistor (open or incorrect value)
- Low battery voltage or poor engine/chassis ground affecting module communication
Fault status
Status
Control module communication bus malfunction detected. One or more modules are not communicating properly on the vehicle data bus; check wiring, termination, and individual module transceivers.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
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HUMMER: 2009
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HUMMER: 2008
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HUMMER: 2007
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HUMMER: 2005
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HUMMER: 2004
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Code
U1500
HYUNDAI
U — Network/User
Wakeup Line Short Circuit To Ground | MOST bus communication lost during extended diagnostic session.
AI status
Completed
Completed
100%
Causes
- Open or short in communication bus wiring (CAN H/CAN L or single-wire bus)
- Failed or intermittent control module(s)
- Poor battery supply or weak/poor ground connections
- Missing or damaged termination resistor(s)
- Water intrusion, corrosion, or damaged connectors on the bus
- Aftermarket device or improperly installed module interfering with bus
Symptoms
- Malfunction indicator lamp or multiple warning lights illuminated
- Loss of specific subsystem functions controlled by one or more modules (e.g., ABS, steering, instrument cluster)
- Unable to communicate with one or more modules using a scan tool
- Intermittent faults that appear/disappear with vibration or moisture
- Modules show as ‘bus off’ or ‘no response’ in diagnostics
What to check
- Read all U‑codes and freeze frame data with a capable scan tool; record which modules are not responding
- Check battery voltage (key on and cranking); ensure >12V at the beginning of diagnosis
- Visually inspect connectors, grounds, and wiring along the bus for corrosion, breaks, or pinch points
- Check for aftermarket modules/devices connected to the bus and disconnect if present
- Measure termination resistance between CAN_H and CAN_L with ignition off (expected ≈60Ω for CAN)
- Backprobe CAN_H and CAN_L with a multimeter and/or oscilloscope to observe idle and active voltages
Signal parameters
- CAN bus idle: CAN_H ≈2.5V, CAN_L ≈2.5V (difference ≈0V)
- CAN dominant: CAN_H ≈3.5V, CAN_L ≈1.5V (difference ≈2V)
- Typical CAN termination: two 120Ω resistors in parallel → ≈60Ω measured between CAN_H and CAN_L (key off)
- Common CAN data rates: 125 kbps, 250 kbps, 500 kbps, 1 Mbps — bus messages should match vehicle data rate
- LIN idle: single wire ≈12V (through pull-up); dominant ≈0V (varies by vehicle) — consult manufacturer spec for single-wire buses
- Check for voltage spikes or noise on bus lines during operation (oscilloscope)
Diagnostic algorithm
- Record all active and stored codes and note which modules are not responding to the diagnostic tool.
- Verify good battery voltage and solid engine/chassis grounds; charge battery if low and recheck communications.
- Perform a visual inspection of the entire communication bus: connectors, splices, modules, and any T‑tap or aftermarket connections. Repair visible damage.
- With ignition off, measure resistance between CAN_H and CAN_L at a central point; expect ≈60Ω. If open or very low, isolate wiring sections to find a short or open.
- With ignition on, backprobe CAN_H and CAN_L at several modules with a multimeter/oscilloscope. Confirm idle voltages ~2.5V and dominant swings when messages occur. If one node holds bus dominant or shows missing signals, suspect that module.
- Disconnect suspect modules one at a time (after checking service information) to see if bus communication returns; remove aftermarket devices first.
- Wiggle harnesses and connectors while monitoring communication for intermittent faults; inspect for moisture intrusion and re-test after drying if needed.
- If a failed module/transceiver is identified, replace or reprogram per manufacturer procedures. After repairs, clear codes and perform a road test and extended system verification.
- If diagnostics are inconclusive, use a capable scope and bus analyzer to capture and decode traffic, or consult wiring diagrams/gateway architecture for further isolation.
Likely causes
- Damaged connector or pin at a gateway/ECU
- Corroded CAN/LIN wiring harness splice or chafed wire shorting to ground
- One module pulling the bus dominant (shorted transceiver)
- Failed termination resistor (open or incorrect value)
- Low battery voltage or poor engine/chassis ground affecting module communication
Fault status
Status
Control module communication bus malfunction detected. One or more modules are not communicating properly on the vehicle data bus; check wiring, termination, and individual module transceivers.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
371
Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HYUNDAI
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HYUNDAI: 2023
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Elantra
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Elantra N
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Kona N
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Tucson
- Hybrid Blue
- Hybrid Limited
- Hybrid SEL Convenience
- Limited, Eng CD G4EN, 4WD
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- Plug-In Hybrid SEL
- SE, Eng CD G4EN, 4WD
- SE, Eng CD G4EN, FWD
- SE, Eng CD G4KN, 4WD
- SE, Eng CD G4KN, FWD
- SEL, Eng CD G4EN, 4WD
- SEL, Eng CD G4EN, FWD
- SEL, Eng CD G4KN, 4WD
- SEL, Eng CD G4KN, FWD
- XRT, Eng CD G4EN, 4WD
- XRT, Eng CD G4EN, FWD
- XRT, Eng CD G4KN, 4WD
- XRT, Eng CD G4KN, FWD
-
-
HYUNDAI: 2022
-
Elantra N
-
Kona N
-
Veloster N
-
HYUNDAI: 2021
-
Veloster N
-
HYUNDAI: 2020
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Palisade
-
Veloster N
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Code
U1500
OPEL
U — Network/User
Local CAN-Bus Malfunction
AI status
Completed
Completed
100%
Causes
- Open or short in communication bus wiring (CAN H/CAN L or single-wire bus)
- Failed or intermittent control module(s)
- Poor battery supply or weak/poor ground connections
- Missing or damaged termination resistor(s)
- Water intrusion, corrosion, or damaged connectors on the bus
- Aftermarket device or improperly installed module interfering with bus
Symptoms
- Malfunction indicator lamp or multiple warning lights illuminated
- Loss of specific subsystem functions controlled by one or more modules (e.g., ABS, steering, instrument cluster)
- Unable to communicate with one or more modules using a scan tool
- Intermittent faults that appear/disappear with vibration or moisture
- Modules show as ‘bus off’ or ‘no response’ in diagnostics
What to check
- Read all U‑codes and freeze frame data with a capable scan tool; record which modules are not responding
- Check battery voltage (key on and cranking); ensure >12V at the beginning of diagnosis
- Visually inspect connectors, grounds, and wiring along the bus for corrosion, breaks, or pinch points
- Check for aftermarket modules/devices connected to the bus and disconnect if present
- Measure termination resistance between CAN_H and CAN_L with ignition off (expected ≈60Ω for CAN)
- Backprobe CAN_H and CAN_L with a multimeter and/or oscilloscope to observe idle and active voltages
Signal parameters
- CAN bus idle: CAN_H ≈2.5V, CAN_L ≈2.5V (difference ≈0V)
- CAN dominant: CAN_H ≈3.5V, CAN_L ≈1.5V (difference ≈2V)
- Typical CAN termination: two 120Ω resistors in parallel → ≈60Ω measured between CAN_H and CAN_L (key off)
- Common CAN data rates: 125 kbps, 250 kbps, 500 kbps, 1 Mbps — bus messages should match vehicle data rate
- LIN idle: single wire ≈12V (through pull-up); dominant ≈0V (varies by vehicle) — consult manufacturer spec for single-wire buses
- Check for voltage spikes or noise on bus lines during operation (oscilloscope)
Diagnostic algorithm
- Record all active and stored codes and note which modules are not responding to the diagnostic tool.
- Verify good battery voltage and solid engine/chassis grounds; charge battery if low and recheck communications.
- Perform a visual inspection of the entire communication bus: connectors, splices, modules, and any T‑tap or aftermarket connections. Repair visible damage.
- With ignition off, measure resistance between CAN_H and CAN_L at a central point; expect ≈60Ω. If open or very low, isolate wiring sections to find a short or open.
- With ignition on, backprobe CAN_H and CAN_L at several modules with a multimeter/oscilloscope. Confirm idle voltages ~2.5V and dominant swings when messages occur. If one node holds bus dominant or shows missing signals, suspect that module.
- Disconnect suspect modules one at a time (after checking service information) to see if bus communication returns; remove aftermarket devices first.
- Wiggle harnesses and connectors while monitoring communication for intermittent faults; inspect for moisture intrusion and re-test after drying if needed.
- If a failed module/transceiver is identified, replace or reprogram per manufacturer procedures. After repairs, clear codes and perform a road test and extended system verification.
- If diagnostics are inconclusive, use a capable scope and bus analyzer to capture and decode traffic, or consult wiring diagrams/gateway architecture for further isolation.
Likely causes
- Damaged connector or pin at a gateway/ECU
- Corroded CAN/LIN wiring harness splice or chafed wire shorting to ground
- One module pulling the bus dominant (shorted transceiver)
- Failed termination resistor (open or incorrect value)
- Low battery voltage or poor engine/chassis ground affecting module communication
Fault status
Status
Control module communication bus malfunction detected. One or more modules are not communicating properly on the vehicle data bus; check wiring, termination, and individual module transceivers.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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