P2E1D

Code

Generic P — Powertrain

Drive Motor A Phase X Current Sensor Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 20 EN: 26 RU: 20

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Page language: EN

Causes

Open circuit or short to ground in phase X current sensor wiring
Corroded or loose connector at the current sensor or inverter/ECU
Failed phase current sensor (hall-effect sensor, current transducer, or shunt amplifier)
Faulty inverter power electronics or control module
Damage to motor phase winding or cables
Low or missing sensor supply/reference (power or ground)

Symptoms

Malfunction Indicator Lamp (MIL) or hybrid system warning lamp illuminated
Reduced drive power or limp-home mode
Loss of torque or poor acceleration
Reduced regenerative braking or altered braking feel
Unusual vibration or noise if phase currents are imbalanced
Related DTCs stored for other motor phases or inverter faults

What to check

Read freeze frame and live data with a capable scan tool; compare phase current readings for all motor phases
Check for additional DTCs in the inverter and HV battery modules
Visually inspect phase cabling, connectors, and sensor mounting for damage, corrosion, or contamination
Verify good connector pin retention and that wiring is not pinched or chafed
Measure continuity and resistance of sensor wiring (with HV system de-energized and service disconnect open)
Verify sensor supply voltage and ground at the control module/sensor connector (use HV‑safe procedures where needed)

Signal parameters

Typical Hall/current-transducer outputs: mid-supply voltage at ~0 A (commonly ~2.5 V) and proportional change with current
A 'low' fault often means sensor output is significantly below the expected no‑load level (for example below ~1.0 V on many systems) or below the other phase sensors by a set threshold
Shunt-based systems produce small mV across shunt; amplifier output should track across phases—low fault = much lower amplitude than other phases
Signal will change dynamically with motor load; compare waveform/levels between phases using oscilloscope or live-data logging

Diagnostic algorithm

Safety first: follow manufacturer high-voltage isolation procedures. Disable high-voltage system, remove service plug, and wear appropriate PPE before touching HV components.
Use a scan tool to confirm P2E1D, record freeze-frame, and view live phase current (and phase voltage) values while noting any related codes.
Visually inspect the inverter/motor harness, connectors, and sensor locations for damage, corrosion, moisture, or rodent damage.
With HV system safely isolated, perform continuity and short-to-ground checks on the sensor wiring from the inverter/control module to the sensor. Repair any opens or shorts.
Check connector terminals for corrosion/bent pins and repair or replace connectors as needed. Re-seat all connections and verify retention.
Re-power low-voltage control circuits (per safe procedure) and measure sensor supply/reference and signal voltage at the control module connector. Compare to expected mid‑supply level or to the other phase sensors.
If wiring and connectors are good but the sensor output remains low, test or swap the current sensor or measure the shunt/amplifier (if serviceable) per manufacturer procedure.
If the sensor and wiring test good, suspect inverter/control module internal measurement circuitry; consult manufacturer guidance for inverter repair or replacement.
After repairs, clear codes and perform a controlled road or bench test while monitoring phase currents to ensure the fault does not return.
If intermittent, inspect for movement-related faults and stress-test wiring harness routing while monitoring live data.

Likely causes

Wiring short to ground or opened conductor between sensor and control module
Connector corrosion or poor pin contact at the sensor or inverter harness
Failed current sensor or sensor amplifier on the inverter/control module
Inverter internal fault (input stage or measurement circuit)
Phase cable damaged (mechanical abrasion, insulation failure) causing abnormal current path

Fault status

⚠️ Status

Drive Motor A Phase X current sensor circuit reported a low signal. The inverter/vehicle control module flagged the reading as below expected range and stored P2E1D; vehicle may limit propulsion or regenerative functions until the fault is addressed.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.0-4.0 hours