Powertrain, generic (extended)

P2C6B Drive Motor A Phase X Current High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2C6B flags an overcurrent in phase X of drive motor A. X, Y and Z name the second three-phase winding set of a dual-winding machine, which a Mitsubishi Electric patent shows with its own inverter bridge and a current sensor per phase. No carmaker documents P2C6B publicly. Ford's 2019 hybrid summary gives the logic for the U/V/W counterparts (P0A5F, P0A62, P0A65): the motor control unit declares overcurrent above 600 A for 400 microseconds, or above 30 A for 200 ms right after power-up, when hardly any current should flow. Real causes are a short between windings or to the housing, or a power switch that stays conducting; a sensor reading too high fakes the fault. The inverter cuts drive to protect itself. P2C6A is the low side, P2C6E and P2C71 the high faults of Y and Z.

Likely causes

Turn-to-turn or ground short in the phase X winding of drive motor A
IGBT/MOSFET of the X leg in the inverter shorted or failing to turn off
Phase X current sensor reading too high (gain or offset drift)
Chafed or wet phase X lead touching another phase or the housing

Symptoms

  • Hybrid or drive system warning with MIL on
  • Sudden loss of electric drive, vehicle may not become ready
  • Isolation fault codes stored at the same time if the winding touches the housing

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€400–7,000
Time1.5–8 h

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

Parts involved

drive motor adrive motor a phase xinverter

Related codes

P2C69P2C6AP2C6EP2C71P0A5FP2E1B

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