P1632 — Volkswagen — Accelerator Pedal Position Sensor 1 Power Supply Malfunction

P1632 (Volkswagen): Accelerator Pedal Position Sensor 1 Power Supply Malfunction — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Accelerator Pedal Position Sensor 1 Power Supply Malfunction. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Check Engine light illumination
  • Limp mode activation
  • Poor throttle response
  • Inconsistent idle speed
  • Vehicle acceleration hesitation

Possible causes

  • Faulty accelerator pedal position sensor
  • Corroded or damaged wiring harness at the pedal connector
  • Open circuit in the 5V reference supply wire
  • Short circuit to ground in the sensor signal line
  • Malfunctioning Engine Control Module (ECM)

What to check

  • Inspect the pedal position sensor connector for signs of water ingress or corrosion
  • Measure the 5V reference voltage at the sensor connector using a multimeter
  • Verify the ground circuit integrity for the pedal assembly
  • Test the signal voltage output while slowly depressing the accelerator pedal
  • Perform a continuity test on the wiring between the sensor and the ECM