Powertrain, generic · Hybrid propulsion

P0A65 Drive Motor A Phase W Current High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A65 reports overcurrent in phase W of drive motor A. It is the third phase code in Hyundai bulletin 17-01-057-1 for the 2017 Ioniq Hybrid, campaign T2J: with an internal coolant leak in the traction motor, P0A65, P0A5F or P0A62 set with Check Engine and hybrid lights, often joined by the isolation fault P0AA6. Reduced power when accelerating and a non-working air conditioner followed. The fix path is the scan tool isolation test, a coolant inspection of the motor and, if confirmed, a new traction motor. In general, a W-phase winding short or a pinched cable has the same effect. Hyundai inverters measure two phases and calculate the third, per a Hyundai patent. P0A64 is the low side, P0A63 the general W code, P0A5F and P0A62 phases U and V.

Likely causes

Internal coolant leak in the traction motor (Hyundai Ioniq Hybrid)
Phase W lead or winding shorted to ground or to another phase
Inverter power stage fault in phase W
Current sensor falsely reporting overcurrent

Symptoms

  • Check Engine and hybrid warning lights
  • Reduced power when accelerating
  • Air conditioning inoperative (Hyundai Ioniq Hybrid)

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€500–7,000
Time2–10 h

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

Parts involved

drive motor a phase winverter

Related codes

P0A63P0A64P0A5FP0A62P0AA6

References: static.nhtsa.gov, patents.google.com, law.cornell.edu.