Faulty phase Z current sensor internal short or failure; Damaged or chafed wiring harness between the sensor and the control module; Corroded or loose electrical connector at the sensor or control module; Short to ground in the sensor signal circuit; Failed inverter or motor control module (less common); Moisture intrusion into the sensor or connector causing low resistance; Aftermarket or incorrect sensor installation causing signal bias

DTC codes / P2Exx · Hybrid propulsion / P2E25

P2E25Drive Motor A Phase Z Current Sensor Circuit Low

Q: What does code P2E25 mean?

Drive Motor A Phase Z Current Sensor Circuit Low. P2E25 indicates that the inverter or motor control module has detected an abnormally low voltage signal from the phase Z current sensor circuit for drive motor A, which is the sensor that measures current flowing through one phase of the electric motor. The computer compares this signal against expected values and flags the code when the circuit voltage stays below the calibrated threshold for a set time, indicating a short to ground, a faulty sensor, or a wiring problem.

P2E25 indicates that the inverter or motor control module has detected an abnormally low voltage signal from the phase Z current sensor circuit for drive motor A, which is the sensor that measures current flowing through one phase of the electric motor. The computer compares this signal against expected values and flags the code when the circuit voltage stays below the calibrated threshold for a set time, indicating a short to ground, a faulty sensor, or a wiring problem.

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
Reduced power or limp mode, often limiting vehicle speed
The vehicle may refuse to start or shift into drive
Intermittent hesitation or shudder during acceleration
Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

Faulty phase Z current sensor internal short or failure
Damaged or chafed wiring harness between the sensor and the control module
Corroded or loose electrical connector at the sensor or control module
Short to ground in the sensor signal circuit
Failed inverter or motor control module (less common)
Moisture intrusion into the sensor or connector causing low resistance
Aftermarket or incorrect sensor installation causing signal bias

How to diagnose and fix it

Connect a scan tool and record all stored and pending codes, then clear codes and test-drive to see if P2E25 returns
Visually inspect the phase Z current sensor, its connector, and the wiring harness for damage, corrosion, or loose pins
Measure resistance and voltage on the sensor signal circuit and compare to manufacturer specifications
Perform a wiggle test on the harness while monitoring live data for the phase Z current signal to catch intermittent faults
Check for short to ground on the signal wire using a multimeter with the sensor disconnected
If wiring and connectors are good, substitute a known-good sensor and recheck live data
If the code persists with a known-good sensor and verified wiring, diagnose or replace the inverter or motor control module

What the phase Z sensor code really tells you

A low signal code often results from a short to ground in the wiring rather than a failed sensor, so always inspect the harness before replacing parts.
Intermittent P2E25 can be caused by water intrusion into the connector, especially after car washes or heavy rain, and may not set again until conditions repeat.
The phase Z current sensor is sometimes integrated into the motor assembly, making replacement more involved and expensive than a stand-alone sensor.
A weak or failing 12-volt battery can cause erratic sensor signals and set this code, so check battery health and charging system first.
Do not overlook aftermarket modifications or poor previous repairs that may have damaged the sensor circuit or introduced a ground loop.

Can I keep driving with P2E25?

Do not continue driving with P2E25 because the vehicle may enter limp mode or lose power unexpectedly, creating a safety risk. Have the vehicle towed to a qualified repair facility for diagnosis.

Tools that help

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