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Home / DTC / C1651 — CAN time-out EPB

C1651 — CAN time-out EPB

Detailed page for trouble code C1651.

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C1651

HYUNDAI C — Chassis

CAN time-out EPB

Brand: HYUNDAI
Type: C — Chassis
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Page language: EN

Causes

  • Open, short or high-resistance in CAN wiring between EPB module and CAN bus
  • Poor or corroded connector pins at EPB module or junctions
  • Failed EPB control module (internal fault)
  • Faulty/loose ground or supply voltage to EPB module
  • Faulty termination resistor(s) or improper CAN bus topology
  • Intermittent wiring damage (chafing, pinched harness)

Symptoms

  • EPB warning lamp or message on instrument cluster
  • Electric parking brake will not apply or release, or operates intermittently
  • Related warnings (ABS, traction control) may illuminate
  • Stored communication/time-out DTC(s) in other modules
  • Vehicle may report restricted function or limp mode related to parking brake
  • No CAN messages from EPB visible with scan tool

What to check

  • Scan tool: read DTCs from all networked modules, check freeze frame and occurrence count
  • Verify ignition and battery voltage present at EPB module
  • Visually inspect EPB connectors and harness for damage, corrosion or water intrusion
  • Measure CAN_H and CAN_L voltages at EPB connector with ignition ON (idle/recessive state)
  • Check CAN differential voltage and look for excessive bus error messages (using oscilloscope if available)
  • Verify presence of 120 ohm termination resistors across CAN_H and CAN_L at the two bus ends

Signal parameters

  • CAN idle (recessive): CAN_H ≈ 2.5V, CAN_L ≈ 2.5V (both near battery midpoint)
  • CAN dominant: CAN_H ≈ 3.5V, CAN_L ≈ 1.5V (differential ≈ 2V)
  • Typical bus differential voltage (dominant) ≈ 1.5–2.5V
  • Termination resistance across CAN_H and CAN_L ≈ 60 ohm measured at a single point (two 120Ω in parallel)
  • No repeated CRC/frame errors visible on bus when healthy

Diagnostic algorithm

  1. Connect a capable scan tool to the vehicle and record all stored and pending DTCs across all modules; note freeze-frame data and time/count.
  2. Attempt to clear the DTC and see if it returns; observe conditions when it sets (key on, engine running, after driving, after vibration).
  3. Visually inspect the EPB connector, pins and wiring for corrosion, bent pins, water intrusion or physical damage; repair as needed.
  4. Verify battery voltage and verify the EPB module supply and ground pins have proper continuity to battery and chassis ground.
  5. With ignition ON, measure CAN_H and CAN_L voltages at the EPB connector; confirm recessive voltages ~2.5V and dominant transitions when other modules transmit (use oscilloscope if possible).
  6. Check for proper termination: measure resistance across CAN_H and CAN_L with ignition off; expect ~60 ohms across the bus at a convenient point.
  7. Inspect and test continuity of CAN_H and CAN_L back to the next modules/junctions; perform wiggle test over the harness while monitoring for comms loss.
  8. If bus error or another module is causing fault, isolate by disconnecting suspect modules one at a time (observe safe procedure) and see if communication with EPB returns.
  9. If wiring and bus integrity are good but no communication with EPB, consider replacing or repairing EPB module per OEM procedures—confirm with module bench test if available.
  10. After repairs, clear codes, cycle ignition and road test to confirm the fault does not return and that EPB functions normally.

Likely causes

  • Connector corrosion or damaged pins at EPB harness
  • Open/short in CAN_H or CAN_L near the EPB module
  • EPB module failure (if all wiring checks good)
  • Loss of supply or ground to EPB preventing CAN transceivers from operating
  • Bus termination missing or damaged causing bus reflections/timeouts

Fault status

⚠️ Status
C1651 — CAN time-out (EPB): EPB module not responding on CAN bus or expected CAN messages timed out.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5–3.5 hours

Similar codes

U0100 U0073 U0121 U0155 C1601 C1621
371

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