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Home / DTC / P24BF — EVAP System Leak Detection Pump Switching Valve Control Circuit High

P24BF — EVAP System Leak Detection Pump Switching Valve Control Circuit High

Detailed page for trouble code P24BF.

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P24BF

Generic P — Powertrain

EVAP System Leak Detection Pump Switching Valve Control Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 8 EN: 25 RU: 8
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Page language: EN

Causes

  • Open or shorted wiring in the switching valve control circuit (short to battery or other high source)
  • Poor or corroded connector or terminal at the valve or ECU
  • Faulty EVAP switching/vent/purge valve (internal shorted coil or internal fault)
  • Blown fuse or incorrect replacement fuse/relay causing abnormal circuit behavior
  • Faulty PCM/ECM driver output (internal transistor failed)
  • Aftermarket electrical accessories or recent repairs that disturbed wiring

Symptoms

  • Malfunction Indicator Lamp (MIL/CEL) illuminated
  • EVAP system inoperative or failed readiness/test
  • Possible drivability unaffected in many cases (no engine run symptoms)
  • Fuel smell or increased evaporative emissions in some cases

What to check

  • Read freeze frame and live data with a scan tool; note valve command and feedback
  • Perform a visual inspection of valve connector, harness, and chassis grounds
  • Back-probe the control wire and measure voltage with valve commanded ON and OFF
  • Measure coil resistance at the valve when disconnected from the harness
  • Check continuity and for shorts to battery voltage or ground between valve and ECM
  • Inspect related fuses/relays and junctions for corrosion or bypassed wiring

Signal parameters

  • Expected control circuit behavior: voltage should switch between approximately 0 V (when driven to ground) and battery voltage (~12–14 V) when not driven — exact behavior depends on vehicle design
  • Typical coil resistance range (varies by manufacturer): ~10–60 Ω (measure at valve disconnected)
  • Typical current draw when energized: commonly 0.1–2 A depending on valve
  • Fault triggers when measured voltage or feedback is higher than the ECU’s expected maximum or when abnormal backfeed is present

Diagnostic algorithm

  1. Retrieve freeze frame and confirm DTC is current. Note other EVAP DTCs present.
  2. Visually inspect the EVAP valve connector, harness, and nearby components for damage, corrosion, or aftermarket splices.
  3. With a diagnostic scan tool, command the switching/vent valve ON and OFF while monitoring the control circuit voltage. Observe whether voltage follows command.
  4. Unplug the valve connector. Measure resistance of the valve coil. Compare to specification or typical range (see signal_params). Very high or infinite resistance indicates open coil; very low indicates short.
  5. With connector disconnected, check for voltage on the control circuit relative to ground (key ON). A steady high voltage when it should be low suggests short to power or a pull-up; an open-circuit reading can appear as high on some ECMs — confirm with continuity checks.
  6. Check continuity between the valve connector and the ECU pin for the control circuit, and check for shorts to battery voltage and to ground along the harness.
  7. If wiring and connector are OK, swap in a known-good EVAP switching valve (if available) or bench-test the suspect valve with proper current-limited supply to observe behavior.
  8. If the valve and wiring check good but the ECU still reports high, suspect ECU driver fault; confirm with manufacturer diagnostics before replacement.
  9. Repair or replace damaged wiring/connectors/valve as indicated. Clear codes and perform EVAP self-test or drive cycle to verify repair.
  10. If intermittent, perform pressure/leak test of EVAP system after repair to ensure system integrity and complete readiness.

Likely causes

  • Connector corrosion or damaged pins at the EVAP valve
  • Wiring shorted to a fused battery feed (voltage backfeed)
  • Intermittent open/short in harness to valve
  • Failed switching valve coil with abnormal internal behavior
  • ECU driver failure (less common)

Fault status

⚠️ Status
EVAP leak detection pump switching valve control circuit voltage above expected range (high). Check wiring, connector, valve coil, and ECM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0443 P0446 P0449 P0442 P0455
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