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DTC codes / P2Exx · Hybrid propulsion / P2E1A

P2E1ADrive Motor A Inverter Voltage Sensor A/B Correlation

P2E1A indicates that the inverter controller for drive motor A has detected a mismatch between two independent voltage sensor readings that should closely agree. The computer compares sensor A and sensor B signals and sets this code when the correlation between them falls outside the expected range, pointing to a sensor, wiring, or inverter internal fault.

SystemPowertrain
Code typeGeneric (all makes)
SeverityHigh
Fix difficultyProfessional
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message, often with no other symptoms
  • Reduced power or limp mode as the inverter limits motor output to protect the system
  • Intermittent hesitation or shudder during acceleration or regenerative braking
  • Possible stalling or failure to start if the inverter shuts down completely
  • A warning message on the dash such as 'Hybrid System Fault' or 'Electric Drive Fault'

Common causes, most likely first

  1. Faulty voltage sensor A or sensor B inside the inverter, causing one signal to drift or fail
  2. Damaged or corroded wiring or connector pins between the sensors and the inverter control module
  3. High-voltage interlock loop issue or poor ground connection affecting sensor reference voltage
  4. Internal inverter circuit board fault, such as a failed analog-to-digital converter or reference voltage regulator
  5. Software calibration error in the inverter control module requiring a reflash or update
  6. Moisture intrusion or contamination inside the inverter housing causing signal interference

How to diagnose and fix it

  1. Connect a scan tool and record all freeze-frame data and related codes to confirm P2E1A is active and not history
  2. Visually inspect the inverter harness, connectors, and ground points for corrosion, chafing, or loose pins
  3. Measure reference voltage and signal voltage at both sensor A and sensor B connectors with a digital multimeter and compare to specifications
  4. Perform a wiggle test on the harness while monitoring sensor voltages to reveal intermittent wiring faults
  5. Check for technical service bulletins or software updates for the inverter control module and apply any available calibration
  6. If wiring and sensors check out, follow the manufacturer's diagnostic flow for internal inverter fault isolation, which may require replacement of the inverter assembly
  7. After repairs, clear codes and perform a road test with live data monitoring to verify sensor correlation returns to normal

What Most Techs Miss on P2E1A

  • A correlation code does not automatically mean a sensor has failed; a poor ground or reference voltage drop can skew both sensors and trigger the same code.
  • Intermittent connector fretting corrosion at the inverter is a common hidden cause that only shows up during temperature swings or vibration.
  • Some vehicles require a specific drive cycle or inverter self-test to complete before the code will clear, so a simple code erase may not be enough.
  • Aftermarket high-voltage components or improper jump-starting can introduce voltage spikes that damage inverter sensor circuits and set this code.
  • The code can be stored without any drivability complaint if the correlation error is small and only occurs under specific load or temperature conditions.

Can I keep driving with P2E1A?

Do not continue driving with this code active, as the inverter may shut down unexpectedly and cause a loss of motive power. Have the vehicle towed to a qualified service facility for diagnosis and repair.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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