P1501 — Volkswagen — Fuel Pump Relay Circuit Short To Ground

P1501 (Volkswagen): Fuel Pump Relay Circuit Short To Ground — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Fuel Pump Relay Circuit Short To Ground. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Engine fails to start
  • Engine stalls while driving
  • Check Engine Light illuminated
  • Fuel pump does not activate when ignition is turned on

Possible causes

  • Short circuit to ground in the fuel pump relay control circuit
  • Faulty fuel pump relay
  • Damaged or frayed wiring harness leading to the fuel pump
  • Corroded or loose relay socket terminals
  • Internal failure of the Engine Control Module (ECM)

What to check

  • Inspect the fuel pump relay for signs of overheating or water damage
  • Test the relay connector for a continuous ground signal using a multimeter
  • Check the wiring harness between the relay and the fuel pump for insulation damage
  • Verify supply voltage at the relay socket pins
  • Swap the relay with a known-good unit to rule out component failure