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Home / DTC / C160A88 — BSD Local CAN bus off | Local CAN Bus Off

C160A88 — BSD Local CAN bus off | Local CAN Bus Off

Detailed page for trouble code C160A88.

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Code

C160A88

HYUNDAI C — Chassis

BSD Local CAN bus off | Local CAN Bus Off

Brand: HYUNDAI
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short or open in CAN_H/CAN_L wiring (including chafing or damaged insulation)
  • Failed BSD module or other node repeatedly transmitting error frames
  • Missing or incorrect termination (open or shorted 120Ω/60Ω network)
  • Short to battery or ground on a CAN line
  • Low or unstable vehicle battery/charging system affecting module operation
  • Corroded/loose connectors or poor ground at BSD or intermediate splice

Symptoms

  • Blind‑Spot Detection warning lamp or message displayed
  • BSD features inoperative (no alerts for vehicles in blind spot)
  • Additional modules on same local CAN may show communication faults or warnings
  • Stored communication DTCs and possible multiple related U-/C‑codes
  • Intermittent operation of BSD or related sensors

What to check

  • Read and record freeze frame, U/C codes and active/inactive status with a dealer-level scan tool
  • Check battery voltage and charging system; ensure stable supply during test
  • Visually inspect BSD wiring, connectors, splices, and harness routing for damage or corrosion
  • Check connector pins (bent, pushed out, corrosion) and secure grounds for BSD and nearby modules
  • Measure DC resistance across CAN_H to CAN_L at key harness connectors with ignition OFF (expected ~60Ω for two 120Ω terminators in parallel)
  • Probe CAN_H and CAN_L with oscilloscope or scan tool while cranking/running to observe waveforms and differential signal

Signal parameters

  • CAN bus nominal recessive voltage: ~2.5 V on CAN_H and CAN_L (both equal)
  • CAN dominant state: CAN_H rises (typically ~3.5 V) and CAN_L falls (typically ~1.5 V) producing ~2 V differential
  • Termination resistance across CAN_H and CAN_L with ignition OFF: ~60 Ω (two 120 Ω terminators in parallel)
  • Typical high-speed CAN bus speeds on vehicle networks: commonly 500 kb/s or 250 kb/s — confirm network speed with scan tool
  • Expected behavior: occasional frames and no continuous error frames or dominant voltages when idle

Diagnostic algorithm

  1. Retrieve all related DTCs from BSD and other modules. Document when the fault first occurred and any related symptoms.
  2. Clear codes and attempt to reproduce. If code returns immediately, suspect wiring or a module actively forcing bus-off.
  3. Verify vehicle battery/charging voltage (should be stable around 12.6–14.5 V during tests).
  4. Perform visual inspection of BSD harness, pins and mating connectors; repair any corrosion, bent pins, or poor contacts.
  5. With ignition ON, measure resistance between CAN_H and CAN_L at the BSD connector (ignition OFF for resistance). Confirm ≈60 Ω. Open or very high resistance indicates missing termination; very low indicates a short.
  6. Backprobe CAN_H and CAN_L with an oscilloscope while operating or attempting communication. Look for valid differential waveform, excessive noise, dominant stuck states, or repeated error frames.
  7. Isolate sections of the bus by disconnecting connectors or other nodes (one at a time) to find the node causing errors. If bus returns to normal when a node is disconnected, that node is suspect.
  8. Inspect for shorts to battery or ground on CAN lines; repair damaged wiring and replace connectors as needed.
  9. Reconnect and retest. If a specific module (e.g., BSD) is confirmed faulty after isolating wiring and termination, replace the module and reprogram/reconfigure per manufacturer procedures.
  10. After repairs, clear codes and perform road test to confirm the issue is resolved and no related communication faults remain.

Likely causes

  • Damaged or shorted CAN wiring/connectors on the BSD local bus
  • Faulty BSD module stuck in error state and forcing bus-off
  • Missing or degraded termination resistor or additional unintended termination
  • Intermittent connector contact causing repeated error frames

Fault status

⚠️ Status
Local CAN bus off detected by BSD module — local CAN network has entered bus‑off state and BSD communication is lost.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

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371

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