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Home / DTC / P0467 — Purge Flow Sensor Circuit Low Input

P0467 — Purge Flow Sensor Circuit Low Input

Detailed page for trouble code P0467.

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Code

P0467

MERCEDES-BENZ P — Powertrain

Purge Flow Sensor Circuit Low Input

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
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Page language: EN

Causes

  • Open or short to ground in purge flow sensor signal circuit
  • Corroded or poorly connected electrical connector at the sensor or ECU
  • Failed purge flow sensor (internal fault)
  • Faulty purge solenoid/valve or stuck closed preventing flow
  • Blown fuse or loss of reference voltage/ground at ECM
  • ECM/PCM internal fault (rare)

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • Reduced or failed EVAP system purge function
  • Hard start or extended cranking after refueling (possible)
  • Engine idle instability or rough idle (less common)
  • Fuel odor from vehicle (if EVAP not sealing)
  • Failed EVAP readiness or inspection test

What to check

  • Read freeze frame data and live PIDs for purge flow sensor and purge valve command
  • Check for related EVAP codes (e.g., purge valve circuit codes, leak codes)
  • Visually inspect harness and connector for damage, corrosion, or water
  • Backprobe sensor connector: verify 5V reference (if applicable), signal voltage, and ground
  • Perform continuity and short-to-ground checks on signal and ground wires
  • Operate purge valve with scan tool while monitoring signal response

Signal parameters

  • Reference voltage (typical): ~5.0 V (key ON) — verify per vehicle spec
  • Signal voltage expected range: ~0.5–4.5 V or specified flow counts — low input considered when signal is near 0–0.5 V
  • Circuit resistance: continuity between sensor ground and chassis ground should be low (
  • No short to battery positive on signal line and no short to ground on signal line

Diagnostic algorithm

  1. Retrieve DTCs, freeze frame, and live data. Note operating conditions when code set.
  2. Inspect the purge flow sensor connector and wiring for damage, corrosion, or moisture. Repair any visible issues.
  3. With ignition ON (engine OFF), backprobe the sensor connector: confirm reference voltage, signal voltage, and ground presence per vehicle specifications.
  4. If reference or ground is missing, trace and repair wiring/fuses to the ECM. If present but signal is low, check for short to ground on the signal wire.
  5. Command the purge valve ON via scan tool while watching the flow sensor signal. If commanded but no change in signal, suspect sensor or valve hydraulic/mechanical issue.
  6. Inspect EVAP lines and purge valve for blockages, collapsed hoses, or disconnected tubing. Replace or repair as needed.
  7. If wiring, ground, and harness check good, swap or bench-test the purge flow sensor/valve (or replace with known-good unit) and recheck signal.
  8. Clear codes and perform a drive cycle or EVAP system test to verify repair. If code returns, perform module-level diagnostics per manufacturer procedures before replacing ECM.

Likely causes

  • Damaged wiring (chafing, broken conductor) between sensor and ECM
  • Failed purge flow sensor or integrated flow sensor assembly
  • Poor ground or intermittent connector contact at sensor
  • Faulty purge control valve not actuating (no flow)
  • Connector corrosion or water intrusion at harness or module

Fault status

⚠️ Status
P0467 — Purge Flow Sensor Circuit Low Input. EVAP purge flow sensor output below expected range. Inspect sensor, wiring, connector, purge valve and related fuses/grounds.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours
856

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