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Home / DTC / U0061 — Vehicle Communication Bus D (-) Low

U0061 — Vehicle Communication Bus D (-) Low

Detailed page for trouble code U0061.

33,912codes
59brands
11,451generic
22,461specific
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Code

U0061

Generic U — Network/User

Vehicle Communication Bus D (-) Low

Brand: Generic
Type: U — Network/User
Views: UK: 31 EN: 35 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on Bus D (-) wiring or connector
  • Open or high-resistance connection in Bus D (-) circuit
  • Corroded or loose connector/terminal at a module or splice
  • Faulty or damaged module driving the bus
  • Faulty or missing termination resistor(s)
  • Moisture/contamination in connectors or wiring harness

Symptoms

  • Loss of communication with one or more modules on Bus D
  • Multiple U- or P-codes related to modules on that bus
  • Reduced or lost vehicle functions (infotainment, ADAS, body systems) served by Bus D
  • Intermittent operation or flickering of affected systems
  • Possible battery drain if a module is shorted to ground

What to check

  • Read all stored and pending codes and freeze frame with a capable scan tool; note other U-codes
  • Verify battery voltage and charging system health (clean battery terminals, >12.4 V at rest)
  • Visual inspection of Bus D wiring, connectors, grommets, and modules for damage or corrosion
  • Backprobe the Bus D (+) and Bus D (-) at a module connector with key ON, engine OFF and measure DC voltage
  • Measure resistance across CAN_H and CAN_L with ignition OFF to check termination (~60 ohms across the pair)
  • Use an oscilloscope to observe CAN-L waveform for stuck low or abnormal signals during communication

Signal parameters

  • Recessive (idle) voltage: CAN-L ≈ 2.5 V (typical 2.0–3.0 V), CAN-H ≈ 2.5 V
  • Dominant state: CAN-L ≈ 1.0–1.5 V, CAN-H ≈ 3.5–4.0 V (differential ≈ 2 V)
  • Fault condition: CAN-L held low below ~1.8 V when it should be near 2.5 V
  • Termination: approximately 60 ohms measured across CAN_H and CAN_L (two 120 Ω terminators in parallel)
  • Use an oscilloscope for time-domain waveforms; a DMM only gives static DC levels

Diagnostic algorithm

  1. Confirm U0061 and collect all related U- and P-codes and freeze frame data with scan tool.
  2. Check and record battery/resting voltage; charge or replace battery if below spec and verify good ground connections.
  3. Visually inspect Bus D harness routing, connectors, and module grounds for damage, corrosion, or water intrusion. Repair obvious issues.
  4. With ignition ON (engine OFF), measure DC voltage at Bus D (-) and Bus D (+) at a known-good module connector. Compare to expected ~2.5 V (recessive).
  5. Measure resistance across CAN_H and CAN_L with ignition OFF; expect ≈60 Ω. If open or very low, investigate termination resistors and wiring.
  6. Use an oscilloscope to probe CAN_L and CAN_H while the network is active. Look for CAN_L stuck low, missing recessive level, or abnormal noise.
  7. If CAN_L is low at the module, disconnect that module and re-test the bus to see if the condition clears. Repeat to isolate the offending module or segment.
  8. If disconnecting modules doesn't isolate the fault, perform connector/continuity checks back to the junctions/splices; repair wiring or connectors as required.
  9. Replace damaged termination resistors, splice assemblies, or wiring sections. If a module is confirmed faulty (driving bus low), replace the module and recheck.
  10. After repairs, clear codes, verify communication restoration, and road-test to confirm the fault does not return.

Likely causes

  • Short to ground at a connector or splice on the Bus D (-) conductor
  • Corroded/loose connector at a module on Bus D
  • Failed module pulling CAN-L low
  • Missing/incorrect termination resistor or harness damage

Fault status

⚠️ Status
U0061 — Vehicle Communication Bus D (-) Low: Controller detected abnormally low voltage on the Bus D negative conductor (CAN-L), indicating a short/high-resistance/termination or module fault affecting network communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

U0061

HYUNDAI U — Network/User

Vehicle Communication Bus D (-) Low

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 24 EN: 25 RU: 24
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on Bus D (-) wiring or connector
  • Open or high-resistance connection in Bus D (-) circuit
  • Corroded or loose connector/terminal at a module or splice
  • Faulty or damaged module driving the bus
  • Faulty or missing termination resistor(s)
  • Moisture/contamination in connectors or wiring harness

Symptoms

  • Loss of communication with one or more modules on Bus D
  • Multiple U- or P-codes related to modules on that bus
  • Reduced or lost vehicle functions (infotainment, ADAS, body systems) served by Bus D
  • Intermittent operation or flickering of affected systems
  • Possible battery drain if a module is shorted to ground

What to check

  • Read all stored and pending codes and freeze frame with a capable scan tool; note other U-codes
  • Verify battery voltage and charging system health (clean battery terminals, >12.4 V at rest)
  • Visual inspection of Bus D wiring, connectors, grommets, and modules for damage or corrosion
  • Backprobe the Bus D (+) and Bus D (-) at a module connector with key ON, engine OFF and measure DC voltage
  • Measure resistance across CAN_H and CAN_L with ignition OFF to check termination (~60 ohms across the pair)
  • Use an oscilloscope to observe CAN-L waveform for stuck low or abnormal signals during communication

Signal parameters

  • Recessive (idle) voltage: CAN-L ≈ 2.5 V (typical 2.0–3.0 V), CAN-H ≈ 2.5 V
  • Dominant state: CAN-L ≈ 1.0–1.5 V, CAN-H ≈ 3.5–4.0 V (differential ≈ 2 V)
  • Fault condition: CAN-L held low below ~1.8 V when it should be near 2.5 V
  • Termination: approximately 60 ohms measured across CAN_H and CAN_L (two 120 Ω terminators in parallel)
  • Use an oscilloscope for time-domain waveforms; a DMM only gives static DC levels

Diagnostic algorithm

  1. Confirm U0061 and collect all related U- and P-codes and freeze frame data with scan tool.
  2. Check and record battery/resting voltage; charge or replace battery if below spec and verify good ground connections.
  3. Visually inspect Bus D harness routing, connectors, and module grounds for damage, corrosion, or water intrusion. Repair obvious issues.
  4. With ignition ON (engine OFF), measure DC voltage at Bus D (-) and Bus D (+) at a known-good module connector. Compare to expected ~2.5 V (recessive).
  5. Measure resistance across CAN_H and CAN_L with ignition OFF; expect ≈60 Ω. If open or very low, investigate termination resistors and wiring.
  6. Use an oscilloscope to probe CAN_L and CAN_H while the network is active. Look for CAN_L stuck low, missing recessive level, or abnormal noise.
  7. If CAN_L is low at the module, disconnect that module and re-test the bus to see if the condition clears. Repeat to isolate the offending module or segment.
  8. If disconnecting modules doesn't isolate the fault, perform connector/continuity checks back to the junctions/splices; repair wiring or connectors as required.
  9. Replace damaged termination resistors, splice assemblies, or wiring sections. If a module is confirmed faulty (driving bus low), replace the module and recheck.
  10. After repairs, clear codes, verify communication restoration, and road-test to confirm the fault does not return.

Likely causes

  • Short to ground at a connector or splice on the Bus D (-) conductor
  • Corroded/loose connector at a module on Bus D
  • Failed module pulling CAN-L low
  • Missing/incorrect termination resistor or harness damage

Fault status

⚠️ Status
U0061 — Vehicle Communication Bus D (-) Low: Controller detected abnormally low voltage on the Bus D negative conductor (CAN-L), indicating a short/high-resistance/termination or module fault affecting network communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0073 U0100 U0101 U0155 U0401
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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+100 karma for a short comment :)
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Code

U0061

MERCEDES-BENZ U — Network/User

Vehicle Communication Bus D (-) low

Brand: MERCEDES-BENZ
Type: U — Network/User
Views: UK: 32 EN: 27 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on Bus D (-) wiring or connector
  • Open or high-resistance connection in Bus D (-) circuit
  • Corroded or loose connector/terminal at a module or splice
  • Faulty or damaged module driving the bus
  • Faulty or missing termination resistor(s)
  • Moisture/contamination in connectors or wiring harness

Symptoms

  • Loss of communication with one or more modules on Bus D
  • Multiple U- or P-codes related to modules on that bus
  • Reduced or lost vehicle functions (infotainment, ADAS, body systems) served by Bus D
  • Intermittent operation or flickering of affected systems
  • Possible battery drain if a module is shorted to ground

What to check

  • Read all stored and pending codes and freeze frame with a capable scan tool; note other U-codes
  • Verify battery voltage and charging system health (clean battery terminals, >12.4 V at rest)
  • Visual inspection of Bus D wiring, connectors, grommets, and modules for damage or corrosion
  • Backprobe the Bus D (+) and Bus D (-) at a module connector with key ON, engine OFF and measure DC voltage
  • Measure resistance across CAN_H and CAN_L with ignition OFF to check termination (~60 ohms across the pair)
  • Use an oscilloscope to observe CAN-L waveform for stuck low or abnormal signals during communication

Signal parameters

  • Recessive (idle) voltage: CAN-L ≈ 2.5 V (typical 2.0–3.0 V), CAN-H ≈ 2.5 V
  • Dominant state: CAN-L ≈ 1.0–1.5 V, CAN-H ≈ 3.5–4.0 V (differential ≈ 2 V)
  • Fault condition: CAN-L held low below ~1.8 V when it should be near 2.5 V
  • Termination: approximately 60 ohms measured across CAN_H and CAN_L (two 120 Ω terminators in parallel)
  • Use an oscilloscope for time-domain waveforms; a DMM only gives static DC levels

Diagnostic algorithm

  1. Confirm U0061 and collect all related U- and P-codes and freeze frame data with scan tool.
  2. Check and record battery/resting voltage; charge or replace battery if below spec and verify good ground connections.
  3. Visually inspect Bus D harness routing, connectors, and module grounds for damage, corrosion, or water intrusion. Repair obvious issues.
  4. With ignition ON (engine OFF), measure DC voltage at Bus D (-) and Bus D (+) at a known-good module connector. Compare to expected ~2.5 V (recessive).
  5. Measure resistance across CAN_H and CAN_L with ignition OFF; expect ≈60 Ω. If open or very low, investigate termination resistors and wiring.
  6. Use an oscilloscope to probe CAN_L and CAN_H while the network is active. Look for CAN_L stuck low, missing recessive level, or abnormal noise.
  7. If CAN_L is low at the module, disconnect that module and re-test the bus to see if the condition clears. Repeat to isolate the offending module or segment.
  8. If disconnecting modules doesn't isolate the fault, perform connector/continuity checks back to the junctions/splices; repair wiring or connectors as required.
  9. Replace damaged termination resistors, splice assemblies, or wiring sections. If a module is confirmed faulty (driving bus low), replace the module and recheck.
  10. After repairs, clear codes, verify communication restoration, and road-test to confirm the fault does not return.

Likely causes

  • Short to ground at a connector or splice on the Bus D (-) conductor
  • Corroded/loose connector at a module on Bus D
  • Failed module pulling CAN-L low
  • Missing/incorrect termination resistor or harness damage

Fault status

⚠️ Status
U0061 — Vehicle Communication Bus D (-) Low: Controller detected abnormally low voltage on the Bus D negative conductor (CAN-L), indicating a short/high-resistance/termination or module fault affecting network communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0073 U0100 U0101 U0155 U0401
611

Browse 611 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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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