Powertrain, generic

P0ED8 Generator Phase Y Current Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0ED8 reports too little current in phase Y of the hybrid generator. No manufacturer documents P0ED8 publicly. Ford's 2019 hybrid summary describes a phase circuit test at power-up for the U-V-W phases: the motor/generator control unit declares a phase circuit fault if less than 5 A is seen over the 100 ms test window. Seen this way, a low Y current is first of all a question of continuity: an open cable or terminal, a failed winding joint or an inverter switch that does not turn on. A sensor that reads too low would make the controller drive more real current than intended, so a low code from the sensor side deserves the same attention. Generator torque and charging power drop. High counterpart: P0ED9; same fault on phases X and Z: P0ED5, P0EDB.

Likely causes

Open or corroded phase Y cable or terminal
Inverter switch for phase Y not turning on
Phase Y current sensor reading too low

Symptoms

  • Generator delivers less charging power
  • Uneven running or noise from the transaxle
  • MIL and hybrid warning

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–5,000
Time1–8 h

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

Parts involved

generator phase yinverter

Related codes

P0ED7P0ED9P0ED5P0EDBP0A73

References: fordservicecontent.com, law.cornell.edu.