P1040 – Throttle Actuator Control Fault (BMW)

Description

P1040 BMW indicates a fault in the throttle actuator control system.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Rough idle

Causes

  • Actuator failure
  • Wiring fault
  • ECU driver issue

Diagnosis

  • Check actuator movement
  • Inspect wiring
  • Scan DME

Repair

  • Replace actuator
  • Repair wiring
  • Repair ECU driver