P2C6D

Code

Generic P — Powertrain

Drive Motor “A” Phase Y Current Low

Brand: Generic

Type: P — Powertrain

Views: UK: 15 EN: 20 RU: 21

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Open or high-resistance wiring between inverter and motor phase Y
Corroded/loose connector or damaged terminal at inverter or motor
Failed phase current sensor or hall-effect sensor in inverter
Internal inverter power-stage (IGBT/MOSFET) failure on phase Y
Open or shorted motor winding or poor motor internal connection on phase Y
Low DC link (inverter supply) voltage or inverter control software/calibration fault

MIL (check engine) or EV system warning lamp illuminated
Reduced drive power or limp mode / torque limited
Reduced regeneration or abnormal braking feel
Audible abnormal noise from motor under load (in some cases)
Driveability issues under acceleration, but engine running normally (for hybrid)

Read freeze frame and full event data with a capable scan tool; record operating conditions when the DTC set
Read related hybrid/EV inverter and motor codes
Visually inspect high-voltage harness, connectors and pins at inverter and motor for damage, corrosion, or loose terminals
Check for signs of water ingress or heat damage at inverter and motor connectors
Confirm DC link (HV battery/inverter) voltage is within specified range during drive attempt
Compare measured phase currents (A) for phases X, Y and Z using appropriate high-voltage, insulated current probe; note differences

Expected phase current: varies with torque; can range from near 0 A (idle) up to hundreds of A under load — compare to other phases
Low-current threshold: current on phase Y significantly lower (for example
DC link voltage: should be within nominal HV battery/inverter operating range (vehicle-specific, e.g., 200–800 V depending on platform)
PWM switching frequency: typically in the single- to low-kHz to tens of kHz range (verify with scope if available)
Current sensor output: analog or digital value from hall-effect sensor inside inverter — check expected sensor voltage/current corresponding to measured phase current

Safety first: only qualified personnel with high-voltage training should inspect and test high-voltage components; disconnect HV system per manufacturer procedures before doing resistance/continuity checks
Scan tool: retrieve all DTCs, freeze frame, and live data. Note conditions when P2C6D set (vehicle speed, torque, DC bus voltage, temperatures). Clear codes and attempt to reproduce to verify persistence.
Visual inspection: inspect harnesses, connectors and service plugs between inverter and motor for damage, corrosion, evidence of overheating or moisture.
Low-voltage checks: with HV system disabled and discharged per procedure, measure continuity and DC resistance between inverter phase Y output and motor phase Y. Compare to other phases. Look for open or significantly higher resistance.
Power-up checks: using insulated/clamp current probe and appropriate PPE, run motor under controlled conditions and measure phase currents for X, Y and Z. Confirm phase Y current is low relative to others.
Inverter checks: check DC link (HV) voltage and inverter internal status bits via scan tool. Inspect inverter for internal faults, overtemperature events or shutdowns affecting phase Y.