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Home / DTC / C161600 — CAN Bus OFF C-CAN | CAN Bus OFF(C-CAN) | C-CAN Bus OFF

C161600 — CAN Bus OFF C-CAN | CAN Bus OFF(C-CAN) | C-CAN Bus OFF

Detailed page for trouble code C161600.

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C161600

HYUNDAI C — Chassis

CAN Bus OFF C-CAN | CAN Bus OFF(C-CAN) | C-CAN Bus OFF

Brand: HYUNDAI
Type: C — Chassis
AI status
Completed
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Page language: EN

Causes

  • Short to ground or battery on CAN_H or CAN_L
  • Open circuit / intermittent connection in CAN wiring or connectors
  • Missing, damaged or incorrect termination resistors
  • Faulty ECU/module driving the C‑CAN bus
  • Battery/ignition power or ground problem affecting a CAN node
  • Corroded or pushed‑out pins, poor shield/grounding, or wiring chafe

Symptoms

  • Multiple modules report lost communication or go to default/fail‑safe
  • MIL or communication related warning lamp illuminated
  • Cluster, ABS, traction, HVAC, immobilizer, or other networked systems inoperative or intermittent
  • Symptoms may be intermittent or permanent depending on wiring/node fault
  • Scan tool shows CAN bus errors, high error counters, or no frames on C‑CAN

What to check

  • Visually inspect CAN harness, connectors, and nearby components for damage, corrosion or recent repairs
  • Check battery voltage and engine ground integrity supplying gateway and ECUs
  • Use scanner to read freeze frames, live data and communication status of modules on C‑CAN
  • Scan for related U‑codes or other CAN bus DTCs (lost communication, bus off)
  • Measure termination resistance across CAN_H and CAN_L at a convenient connector (expected ~60 Ω with both terminators present)
  • Monitor CAN traffic with scanner/oscilloscope to confirm presence/absence of messages and error frames

Signal parameters

  • CAN_H / CAN_L recessive idle: ~2.5 V each
  • CAN_H dominant: typically ~3.5 V; CAN_L dominant: typically ~1.5 V (voltages vary by vehicle)
  • End‑to‑end resistance across CAN_H–CAN_L with both terminators present: ~60 Ω (two 120 Ω terminators in parallel)
  • Bus bit rate (e.g., 500 kbps, 250 kbps) — verify correct for vehicle
  • Error counters / node error state (Error Active / Error Passive / Bus‑Off) reported by modules
  • Frame rate and expected message IDs for C‑CAN (use OEM data to compare)

Diagnostic algorithm

  1. Record all DTCs and freeze frame data; note affected modules and times of occurrence
  2. Inspect battery, main fuses and grounds for gateway and C‑CAN modules; repair any supply/ground faults
  3. Visually inspect CAN wiring and connectors along C‑CAN routing; repair damaged insulation or terminals
  4. Measure termination resistance across CAN_H–CAN_L at a central splice or connector; confirm ~60 Ω with both terminators present; repair if incorrect
  5. Use a scan tool to monitor module communications and error counters; identify any module showing high TEC/REC or reporting bus errors
  6. With scope or CAN analyzer check CAN_H and CAN_L idle and dominant voltages and look for excessive noise, missing recessive state or repeated error frames
  7. If traffic shows excessive errors, systematically isolate segments or disconnect suspected modules (one at a time per service manual) to find the node that cures the bus off condition
  8. If a module is identified as faulty, verify its supply/ground and connectors before replacing; follow OEM reprogramming procedures if replacement is required
  9. After repair replace/repair wiring or connectors, clear codes, and verify normal CAN traffic and that code does not return
  10. If no wiring or module fault is found, consult OEM service information for gateway or software updates affecting C‑CAN

Likely causes

  • Damaged wiring at harness branches or door/hinge/pivot points
  • Connector corrosion or bent pins at gateway, junction or main harness connector
  • Failed module repeatedly transmitting error frames and forcing bus off
  • Loss of supply/ground to a gateway or node causing abnormal CAN levels
  • Missing 120 Ω terminators or an extra termination (incorrect resistance)

Fault status

⚠️ Status
CAN Bus OFF (C‑CAN): C‑CAN controller has entered Bus‑Off state due to excessive bus errors. Communication on C‑CAN is lost until underlying fault is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0073 U0100 P0600 U0140 U0155
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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