Powertrain, generic · Hybrid propulsion

P0A4F Generator Position Sensor Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0A4F flags a generator resolver signal that drops out or jumps briefly and then recovers, as opposed to a steady fault. No manufacturer documents P0A4F publicly. Mitsubishi and Volvo handle short interruptions inside the general circuit code instead: Volvo lists P0A4B in its inverter generator module with the fault type intermittent, and Mitsubishi tells technicians to treat a resolver fault that cannot be reproduced as an intermittent malfunction of harness and connectors. CARB requires circuit continuity checks on hybrid input components. Loose terminals, fretting contacts, a chafed cable near moving parts or heat-related cracks are the usual suspects. P0A4B is the steady circuit fault, P0A4C plausibility, P0A4D/P0A4E low and high. Symptoms come and go, often with a brief loss of hybrid function.

Likely causes

Loose or fretting terminals in the resolver connectors
Chafed resolver cable that breaks contact under vibration
Heat-related cracks in wiring or solder joints

Symptoms

  • Hybrid warning that appears and clears again
  • Short loss of electric drive or jerky power delivery
  • Fault often linked to bumps or heat

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–6 h

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

Parts involved

generator position sensorwiring harnesshybrid control module

Related codes

P0A4BP0A4CP0A4DP0A4EP0A43

References: static.nhtsa.gov, mitsubishitechinfo.com, law.cornell.edu.