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Home / DTC / C2608 — Air Leakage

C2608 — Air Leakage

Detailed page for trouble code C2608.

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Code

C2608

HYUNDAI C — Chassis

Air Leakage

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 23 EN: 33 RU: 21
AI status
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Page language: EN

Causes

  • Cracked or disconnected vacuum/air hose or line
  • Loose or damaged hose clamp or connection
  • Leaking intake manifold gasket or flange
  • Faulty vacuum pump or compressor (if equipped)
  • Damaged actuator diaphragm or pneumatic component
  • Faulty purge/vent valve or other EVAP component

Symptoms

  • Check engine light or related warning lamp illuminated
  • Rough or unstable idle
  • Reduced engine power or hesitation under acceleration
  • Hissing noise from engine bay or near a vacuum line
  • Incorrect operation of vacuum-operated actuators (doors, HVAC flaps, etc.)
  • Hard or changed brake pedal feel if brake booster vacuum is affected

What to check

  • Scan vehicle for active/confirmed codes and freeze-frame data; note related codes (lean, EVAP faults, MAP/Sensor codes).
  • Perform careful visual inspection of vacuum and air lines, connectors, clamps, and intake components for cracks, splits, or disconnections.
  • Listen for audible hissing with engine running; use a mechanics stethoscope if available.
  • Use a handheld vacuum pump to check diaphragms/actuators for holding vacuum.
  • Perform a smoke test (smoke machine) to locate leaks in intake, vacuum, or EVAP plumbing.
  • Check operation of purge/vent solenoids with a scan tool or multimeter and verify they seat properly.

Signal parameters

  • Intake manifold vacuum at idle: typically ~17–22 inHg (approx. 430–560 mbar) on a healthy engine; significant deviation suggests leak.
  • MAP sensor / manifold pressure: voltage or kPa should change smoothly with throttle; abrupt or incorrect values can indicate leakage.
  • Vacuum pump output (if equipped): consult factory spec; should build/hold vacuum under load.
  • EVAP system pressure: sealed test should hold near atmospheric pressure; smoke will reveal leaks.
  • Purge valve duty/command: solenoid should switch per scan-tool commands (0–100% duty depending on command) and show expected open/close behavior.

Diagnostic algorithm

  1. Retrieve trouble code and related codes with an OBD-II scanner. Note freeze-frame and conditions when the code set.
  2. Perform a visual inspection of vacuum/air lines, fittings, clamps, intake boots, and EVAP hoses. Replace or reconnect any visibly damaged or disconnected hoses.
  3. With the engine running, carefully listen for hissing. Use a rubber hose or stethoscope to pinpoint leaks.
  4. If visual/loud leaks are not found, perform a smoke test on the intake/vacuum/EVAP systems to locate small or concealed leaks.
  5. Isolate suspected components: use a handheld vacuum pump to apply vacuum to actuators and verify they hold vacuum for the manufacturer-specified time.
  6. Test purge/vent solenoids and other valves electrically and functionally with a scan tool; replace any that fail to seat or operate correctly.
  7. Inspect intake manifold and throttle body gaskets for leaks; tighten fasteners to spec or replace gaskets if leaking.
  8. If a vacuum pump or compressor is present, verify its output and check for internal leakage or wear; replace if out of spec.
  9. After repairs, clear codes, perform readiness/EVAP tests and a road or drive-cycle to confirm the DTC does not recur.
  10. If the code returns, document conditions, re-scan for additional codes, and escalate to component-level testing or dealer technical resources if needed.

Likely causes

  • Cracked, split, or disconnected vacuum hose between intake and actuator
  • Loose hose clamp at an intake or vacuum connection
  • Faulty purge valve or EVAP hose leak
  • Damaged actuator (diaphragm) that cannot hold vacuum
  • Intake tract or gasket leak around manifold or throttle body

Fault status

⚠️ Status
Air/vacuum leak detected — inspect vacuum and air lines, intake and EVAP components for leaks; verify vacuum-operated devices.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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359

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