Powertrain, generic (extended)

P271A Park Pawl Position Sensor A Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

With park-by-wire the pawl is moved by an actuator instead of a cable, and a position sensor tells the controller whether it is engaged. P271A means the signal of sensor A has dropped below its valid band. Ford's 2026 safety recall 26V688 shows a real case: on 2026-2027 Lincoln Nautilus Hybrid and 2027 Corsair Hybrid with the HF55 hybrid transmission, an unvalidated anti-rust oil inside the Integrated Park Module attacked the circuit board coating, the rotary sensor circuit corroded and its output voltage sank. Dealers found P271A. Owners saw a wrench lamp with Service Vehicle Soon or Shifting System Error, could not leave Park, or the car shifted to Neutral while moving. The fix is a new module with current software.

Likely causes

Corrosion on the park module circuit board (Ford HF55, recall 26V688)
Sensor A signal wire shorted to ground
Missing or low reference voltage to sensor A
Failed position sensor A

Symptoms

  • Vehicle cannot be shifted out of Park
  • Unexpected shift to Neutral while driving
  • Service warning such as Shifting System Error

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–1,500
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

park pawl position sensor awiring harness

Related codes

P271BP271CP271DP272CP07B5

References: static.nhtsa.gov, en.wikipedia.org, law.cornell.edu.