P2C69

Code

Generic P — Powertrain

Drive Motor “A” Phase X Current

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 33 RU: 21

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Causes

Open or short in motor phase X wiring (including connectors)
Faulty phase current sensor (sensor for phase X or shared sensor)
Internal inverter / power electronics failure (IGBT/MOSFET, gate driver)
Damage or short in motor windings (phase X)
Poor connections, corrosion, or high resistance at HV connectors or contactors
Software/calibration error or incorrect parameters in motor controller

Symptoms

Malfunction Indicator Lamp (MIL) or system warning illuminated
Reduced propulsion power or limp-home mode
Torque surges, juddering, or vibration during acceleration
Unusual motor noise or overheating of inverter/motor
Inconsistent regenerative braking behavior
Vehicle may not move or experiences sudden loss of drive

What to check

Read DTC and freeze-frame data with a compatible scan tool; record drive conditions when fault set
Check for related DTCs (inverter, CAN, HV battery, contactor faults)
Visual inspection of motor, inverter, HV cables and connectors for damage, heat discoloration, corrosion or water intrusion
Verify HV interlocks, contactors and fuses are intact and properly seated
Check connector pins for corrosion, looseness or bent pins at inverter and motor
Using service data, confirm expected sensor signal type and ranges before probing

Signal parameters

Phase current waveform (AC) should correlate with motor torque demand and be roughly balanced across phases
Phase-to-phase resistance: typically very low (milliohms); values must match OEM spec
Current sensor/sensing circuit output: typically in a defined voltage range (e.g., 0–5 V) or transmitted via controller CAN; consult OEM data for exact values
Insulation resistance to ground: should be high (megaohm range); low values indicate internal motor short
Controller fault flag and torque request vs actual torque — compare commanded vs measured

Diagnostic algorithm

Retrieve P2C69 and any additional codes; save freeze-frame and live data. Check if code is current or historical.
Perform a careful visual inspection of motor and inverter wiring, connectors, and mounting for damage, overheating or contamination.
With HV system safely de-energized, measure continuity and resistance of phase X wiring between inverter and motor; compare to other phases. Look for opens/shorts to chassis.
Check connector pin condition and repair any corrosion or damage. Re-pin or replace connector housings as required.
Restore power and with appropriate PPE and tools, monitor phase currents live (clamp meter or scope on phase conductors) during controlled run to compare phases under load. Look for missing or erratic phase current.
If phase currents are abnormal only on one phase, suspect wiring, connectors, or motor winding damage. If all phases abnormal or sensing circuit inconsistent, suspect inverter or current sensor.
Measure phase-to-phase resistance and insulation resistance of motor windings (de-energized). Replace motor if windings shorted or out of spec.
If wiring and motor check OK, test or replace inverter current sensing circuitry / power stage per OEM procedure. Consider swapping identical inverter modules (if serviceable) to see if fault follows module.
Update controller software/calibration and clear codes; perform controlled function test and road/dyno test to confirm repair.
If intermittent, perform extended data logging under varied loads to capture fault conditions. Consult OEM tech bulletins if available.