P2E1F

Code

Generic P — Powertrain

Drive Motor A Phase Y Current Sensor Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 38 RU: 13

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Page language: EN

Causes

Open or short in the phase Y current sensor harness or connector
Corroded or loose connector at the motor/inverter
Failed phase Y current sensor (Hall-effect, AMR, CT, or shunt)
Faulty inverter/motor controller input (ADC or conditioning circuit)
High-voltage event or water/contaminant intrusion damaging sensor or wiring
Software/calibration error or lost sensor configuration

Symptoms

Malfunction Indicator Lamp (MIL) or EV system warning illuminated
Reduced drive power or limp/limited power mode
Loss of regeneration / disabled regenerative braking
Motor torque reduced, inconsistent torque, or judder
Stored additional drive/inverter DTCs
Vehicle may not move or driveability degraded

What to check

Read freeze frame and all stored DTCs; note whether fault is permanent, pending or intermittent
Visually inspect wiring and connectors for the phase Y current sensor for damage, corrosion, water ingress, or pin damage
Check connector seating and locking tabs at the motor, inverter, and sensor
Verify HV interlock and vehicle low-voltage battery is within spec before testing
Scan live data: compare phase Y current/sensor values to phase X/Z (other phases) at idle, during commanded torque and coast
Measure sensor supply voltage and reference (if applicable) at the connector

Signal parameters

Sensor type: typically Hall-effect or similar current sensor or shunt-based measurement — consult vehicle service data
Typical signal: DC offset reference (commonly ~1.5–2.5 V) with modulation proportional to AC phase current; exact voltage/current slope is vehicle-specific
Open-circuit: signal may float to supply rail or ground; short to 12/48 V or ground will produce out-of-range reading
Expected behavior: phase Y signal should behave similarly to phase X/Z under identical drive conditions (same waveform shape and amplitude, phase-shifted as appropriate)
Data update: motor controller samples tens to thousands of times per second; PSCAN/CAN messages may broadcast aggregated current values at 10–100 Hz depending on vehicle

Diagnostic algorithm

Retrieve all DTCs and freeze frame data. Record VIN, software version, and any related inverter/motor codes.
Ensure high-voltage system is de-energized and isolations applied. Follow manufacturer safety procedures for HV systems before performing any continuity or resistance checks.
Perform a visual inspection of wiring and connectors for phase Y between motor, sensor and inverter. Repair any chafed insulation, damaged pins, or corrosion.
With HV de-energized, check continuity/resistance of sensor signal, supply and ground wires back to the inverter. Look for opens, shorts or high resistance.
Re-energize HV per safe procedure. Using an oscilloscope or high-voltage-safe lab scope probe (or approved diagnostic tool), capture the phase Y current sensor signal at the inverter connector while commanding low-speed torque or idle. Compare waveform and amplitude to phase X and Z.
Check sensor supply/reference voltages at the connector with a DVM or scope; confirm they match specified values in the service manual.
If wiring and connector checks pass but the signal is incorrect or absent, swap or temporarily substitute the phase Y sensor with a known-good sensor (if possible) or swap channels internally (where permitted) to determine if the sensor or inverter input is faulty.
Inspect inverter/motor controller for hardware faults if the sensor and harness are good. Check for blown internal protection devices, water intrusion, or burned components.
Update or reflash inverter/motor controller software if a known software bug or calibration issue matches the symptom and service bulletin exists.
After repairs, clear DTCs and perform a road/functional test replicating the condition to confirm the fault does not return. Re-scan to verify no additional related codes are stored.

Likely causes

Broken or shorted wiring between motor/inverter and current sensor
Corroded/loose connector at the motor or inverter harness
Failed phase Y current sensor element
Faulty inverter electronics (sensor input stage)

Fault status

⚠️ Status

Drive Motor A Phase Y Current Sensor Circuit — sensor signal out of range, missing or inconsistent. May trigger reduced power or motor disable until repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.5 hours