VW Check Engine Code
P0455 on VW
Evaporative Emission Control System Leak Detected (Large Leak)
Also covers: Volkswagen, Audi, SEAT, Skoda
P0455 on VW: what makes it different
VW's EVAP system relies on either a leak detection pump (LDP) or a natural vacuum leak detection (NVLD) module depending on model year, both of which are known to wear out and trigger large-leak EVAP faults over time.
Most-affected engines
- 2.0T EA888 (Jetta, GTI, Passat)
- 1.8T (Jetta, Golf, Beetle)
- 2.5L inline-5 (Jetta, Rabbit)
- TDI diesel EVAP-equivalent systems (Golf, Jetta)
Common model years: 2005–2017
Most likely cause on VW
Leak detection pump (LDP) or NVLD module failing to build the required vacuum/pressure for the EVAP test.
Known VW engine-family issues
Many VW models from the mid-2000s to mid-2010s use a leak detection pump mounted near the fuel tank that is a common wear item — it's a frequent root cause of recurring P0455 codes once a vehicle passes the 80,000–100,000 mile range.
VW-specific causes (most common first)
- Leak detection pump (LDP) diaphragm or solenoid wearing out with age
- Gas cap not sealing or missing entirely
- Cracked EVAP hose near the fuel tank or canister, a known weak point on VW's EVAP routing
- Charcoal canister purge valve stuck open
- Fuel tank sending unit gasket leaking vapor pressure
- Corroded or disconnected EVAP wiring connector at the LDP
VW-specific diagnostic tip
Listen for the leak detection pump cycling (a faint clicking/pumping sound from under the rear of the car) shortly after startup — if you don't hear it at all, the LDP itself has likely failed rather than there being an actual leak in the hoses.
Symptoms drivers report
- Check engine light
- Fuel smell around the car (occasional)
Typical repair cost on VW
Most VW owners fix P0455 for between $40 and $450, depending on which underlying cause turns out to be at fault. Start with the most-likely cause for your vehicle — Leak detection pump (LDP) or NVLD module failing to build the required vacuum/pressure for the EVAP test. — before throwing parts at it.
VW P0455 FAQ
Is the leak detection pump expensive to replace on a VW?
It varies by labor access, but the part itself is moderately priced; most of the cost is labor since it's mounted near the fuel tank/rear of the vehicle.
Can a loose gas cap alone cause P0455 on a VW?
Yes, a missing or poorly sealing gas cap is enough to trigger a large-leak detection on VW's EVAP system, so it's the first thing to rule out.
Does P0455 affect fuel economy on my VW?
Not directly — it's a vapor emissions code, not a fuel delivery issue, so you likely won't notice any mileage change.
Related codes
Drive a different make? See the general P0455 guide for cross-vehicle causes and symptoms.
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Most common fix for P0455:
Replacement gas capAs an Amazon Associate, AXLY earns from qualifying purchases. General P0455 guide →
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