Powertrain, generic (extended)

P2E23 Drive Motor A Phase Z Current Sensor Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2E23 points to a wiring or circuit defect around the phase Z current sensor of drive motor A that is not classed as low or high. Whether a Z sensor exists at all depends on the design. A Hyundai patent on hybrid motor drives notes that an inverter may carry three sensors or only two, since the three currents of a star winding cancel out and the controller can compute the missing one. A computed phase cannot raise a sensor circuit code, so P2E23 presumes a measured Z, as in the Mitsubishi Electric layout with one sensor each for X, Y and Z. No manufacturer documents P2E23 publicly. The Hyundai text also names loose connectors from vibration, heat and corrosion as typical disturbances of such sensors. Inspect the inverter's low-voltage plug first. Range: P2E24; low and high: P2E25, P2E26.

Likely causes

Loose or corroded low-voltage connector at the inverter

Phase Z current sensor in the inverter failed

Supply or ground of the Z sensor interrupted

Symptoms

Hybrid warning lamp and MIL
Electric drive limited or switched off
Fault may come and go with vibration or temperature

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€200–5,000

Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor a phase z current sensorwiring harnesshybrid control module

References: image-ppubs.uspto.gov, image-ppubs.uspto.gov.