What does fault code P0455 mean?

The control module has detected a fault in the Evaporative Emission System (EVAP) Leak Detected (large leak)) (P0455). Measurements: • Evaporative Emission System (EVAP) Leak Detected (large leak)) – Coil Resistance (Resistance (Ω)): 3 - 30 Ω (typical) [Condition: Connector disconnected at 20°C] • Evaporative Emission System (EVAP) Leak Detected (large leak)) – Duty Cycle (PWM (%)): 5 - 95 % (modulates with target) [Condition: Engine running, actuator in control] • Evaporative Emission System (EVAP) Leak Detected (large leak)) – Supply Voltage (Voltage (V)): 11.8 - 14.4 V [Condition: Ignition ON at connector] Oscilloscope: Capture the PWM control signal. The square wave must have clean edges, a stable frequency (typically 30 - 200 Hz), and a distinct flyback spike on every switch-off. (Scale: 2 ms/div, 20 V/div)

What are the symptoms of fault code P0455?

Valve or flap mechanism remains mechanically stuck in the closed position Check Engine Light (MIL) illuminated Possible drivability or power reduction Risk of failing an emissions inspection

What causes fault code P0455?

Most likely: Mechanical sticking or debris/carbon contamination jamming Evaporative Emission System (EVAP) Leak Detected (large leak)) Likely: Chafed or pinched wiring harness along the signal path to Evaporative Emission System (EVAP) Leak Detected (large leak)) Possible: Internal mechanical wear or carbon deposits inside Evaporative Emission System (EVAP) Leak Detected (large leak)) Rare: Defective internal output driver or reference circuit in the control module for Evaporative Emission System (EVAP) Leak Detected (large leak))

How do you fix fault code P0455?

Command the actuator via scan-tool output tests to determine if the solenoid can overcome the return spring. Verify loaded supply voltage and harness terminal pins at Evaporative Emission System (EVAP) Leak Detected (large leak)). Check circuit continuity and ground-side voltage drop (< 0.05 V) for Evaporative Emission System (EVAP) Leak Detected (large leak)). Check supply and the low-side driver at the ECM connector. Replace the actuator or repair the circuit based on the readings. Mechanic tip: Use the scan-tool output test with the scope on the control side at the same time. If duty changes but the actuator does not move, the valve is stuck — not the electrical fault you were chasing.

Standard EOBD

P0455 - Fordampingsutslipp (EVAP) – stor lekkasje oppdaget)

Relatert:Fordampingsutslipp (EVAP), Ledningsnett og kontakter, Styreenhet (ECM/PCM)

System

Drivlinje (Motor og girkasse)

Kontakt oss Finn reparasjon

Teknisk beskrivelse

Styreenheten registrerer en feil i Fordampingsutslipp (EVAP) (P0455).

Multimeter Målepunkter & Nominelle Verdier

Målepunkt / Komponent	Måletype	Nominelt Målområde	Målevilkår
Fordampingsutslipp (EVAP) – spolemotstand	Motstand (Ω)	3 - 30 Ω	Frakoblet ved 20°C
Fordampingsutslipp (EVAP) – arbeidssyklus	PWM (%)	5 - 95 %	Motor i gang

Fordampingsutslipp (EVAP) – spolemotstandMotstand (Ω)

Børverdi:3 - 30 Ω

Frakoblet ved 20°C

Fordampingsutslipp (EVAP) – arbeidssyklusPWM (%)

Børverdi:5 - 95 %

Motor i gang

Oscilloskop Kurveformanalyse

2 ms/div, 20 V/div

Registrer PWM-styresignalet; rene flanker, stabil frekvens og flyback-spiss.

Mulige årsaker

Mekanisk fastkiling eller sot som blokkerer Fordampingsutslipp (EVAP)

Gnagd eller klemt ledningsnett fram til Fordampingsutslipp (EVAP)

Mekanisk slitasje eller sotbelegg i Fordampingsutslipp (EVAP)

Defekt driver eller referanseutgang i styreenheten for Fordampingsutslipp (EVAP)

Symptomer

Ventil eller spjeld sitter fast i lukket stilling

Motorlampe (MIL) lyser

Mulig redusert kjørbarhet eller effekt

Risiko for underkjent EU-kontroll

Anbefalt tiltak

Aktiver med aktuatortest for å se om den åpner.

Sjekk matespenning og kontaktstykke ved Fordampingsutslipp (EVAP).

Mål kontinuitet og jordspenningsfall (< 0.05 V) for Fordampingsutslipp (EVAP).

Sjekk matning og driver i ECM-kontakten.

Mekanikerens tips

Bruk skannerens aktuatortest med oscilloskop på styresiden samtidig. Endres duty uten mekanisk respons, har ventilen kjørt seg fast.

Vanlige kombinasjoner

P0441

P0455

P0456

P0441, P0455, P0456 VW 2.0 TSI EA888 – Tankavluftningsventil N80 & EVAP Teknisk Feilsøkingsguide

VOLKSWAGEN • 144 analyser

Vis alle diagnostiske kombinasjoner

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