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

U0061 — Vehicle Communication Bus D (-) Low

Detailed page for trouble code U0061.

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Code

U0061

HYUNDAI U — Network/User

Vehicle Communication Bus D (-) Low

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

Causes

  • Short to ground on the Bus D (-) conductor
  • Damaged or chafed wiring/insulation on Bus D (-)
  • Corroded or loose connector or terminal on a module or splice
  • Faulty module transceiver pulling Bus D (-) low
  • Incorrect or missing bus termination (bad resistor, open/short)
  • Low or unstable vehicle battery/poor main ground

Symptoms

  • Multiple modules report communication faults or go offline
  • Illuminated dash warning lights (CAN/network related)
  • Loss of features controlled over that bus (brakes, ABS, stability, cluster, etc.)
  • Intermittent or permanent message loss between modules
  • Possible erratic behavior of systems on that network

What to check

  • Connect a factory scan tool and note all active/historic U-codes and modules not responding
  • Verify battery voltage and main chassis/engine grounds are clean and tight
  • Visually inspect Bus D (-) wiring, connectors, and splices for damage, corrosion, or water
  • Backprobe Bus D (+) and Bus D (-) at multiple modules to compare voltages
  • Check bus termination resistance across D+ and D- (approx. 60 Ω total for CAN)
  • Use an oscilloscope to view CAN waveforms for shorts, noise, or missing recessive/dominant levels

Signal parameters

  • Expected idle (recessive) voltage on Bus D (-): approx. 2.5 V
  • Expected dominant voltage on Bus D (-): approx. 1.5 V (when bus is dominant by a node)
  • Expected voltage difference (CAN_H - CAN_L): ~0 V recessive, ~2.0 V dominant
  • Typical termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H and CAN_L
  • Any steady Bus D (-) voltage significantly below ~2.0 V at idle indicates a low condition

Diagnostic algorithm

  1. Record freeze frame and list of modules not responding using a scan tool. Note related U-codes.
  2. Verify battery state-of-charge and clean/secure negative and positive battery terminals and chassis grounds.
  3. Visually inspect Bus D wiring harnesses, connectors, and modules for damage or corrosion; repair obvious defects.
  4. With ignition ON (engine off), backprobe Bus D (+) and Bus D (-) at a known good module and at modules not responding; record voltages.
  5. Measure resistance across CAN_H and CAN_L with ignition off; expect ~60 Ω. If open or very low, investigate terminations.
  6. Use an oscilloscope to view waveform at Bus D (-) and Bus D (+) for proper recessive/dominant levels, noise, or shorted sections.
  7. Isolate sections by disconnecting harness connectors or modules (one at a time) to locate where Bus D (-) voltage returns to normal. When disconnecting, follow manufacturer safety and anti-theft procedures.
  8. If a module is suspected, verify power/ground to that module and swap or bench-test the module if possible to confirm transceiver failure.
  9. Repair or replace damaged wiring, connectors, terminations, or faulty modules. Reassemble, clear codes, and verify normal communication and that U0061 does not return.
  10. Advise customer of any aftermarket accessories found connected to CAN and remove or correct installations.

Likely causes

  • Short to ground at a wiring harness or connector on Bus D (-)
  • Faulty control module with a damaged CAN transceiver
  • Poor ground or battery voltage that changes bus voltage
  • Intermittent connector corrosion or water intrusion
  • Failed or incorrectly installed termination resistor

Fault status

⚠️ Status
Control Module Communication Bus D (-) Low voltage detected. Network negative conductor voltage below expected threshold; communication on Bus D may be lost or degraded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0060 U0073 U0100 U0101 U0140
371

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