P148DEVAP leak-detection pump: implausible frequency

• Volkswagen group code · Engine

How the car detects it

The pump that tests the fuel-vapour (EVAP) system for leaks gives a signal the engine computer can't use, so the leak test can't run.

What you may notice

• Check-engine light possible

Likely causes

• PossibleLeak-detection pump
• PossibleWiring or connector
• RareBlocked filter or hose at the pump

Sources

• static.nhtsa.gov › MC-10166780-0001.pdf · official document

Backed by an official manufacturer document.

From Obdaryn's Volkswagen group pack, exactly as the app shows it, with the public sources above. Guidance only; confirm with a workshop.