Damaged or corroded wiring in the phase Z circuit between the inverter and motor; Loose, backed-out, or corroded connector terminals at the inverter or motor; Failed current sensor inside the inverter that misreports phase Z current; Internal inverter fault, such as a failed driver circuit or power module for phase Z; Shorted or open phase winding inside the drive motor; Poor chassis ground or power supply connection to the inverter controller; Software calibration issue in the inverter control module requiring reprogramming

DTC codes / P2Cxx · Hybrid propulsion / P2C70

P2C70Drive Motor "A" Phase Z Current Low

Q: What does code P2C70 mean?

Drive Motor "A" Phase Z Current Low. P2C70 indicates that the inverter controller for drive motor A has detected an abnormally low current in phase Z, which is one of the three electrical phases that power the motor. The computer compares commanded current with measured feedback and sets this code when the phase Z current falls below the expected threshold during operation.

P2C70 indicates that the inverter controller for drive motor A has detected an abnormally low current in phase Z, which is one of the three electrical phases that power the motor. The computer compares commanded current with measured feedback and sets this code when the phase Z current falls below the expected threshold during operation.

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, limiting vehicle speed and acceleration
Shuddering, vibration, or rough operation from the drive motor under load
Difficulty starting from a stop or hesitation when accelerating
Abnormal noises such as whining or clicking from the motor or inverter area
Complete loss of drive power in severe cases, requiring a tow

Common causes, most likely first

Damaged or corroded wiring in the phase Z circuit between the inverter and motor
Loose, backed-out, or corroded connector terminals at the inverter or motor
Failed current sensor inside the inverter that misreports phase Z current
Internal inverter fault, such as a failed driver circuit or power module for phase Z
Shorted or open phase winding inside the drive motor
Poor chassis ground or power supply connection to the inverter controller
Software calibration issue in the inverter control module requiring reprogramming

How to diagnose and fix it

Scan all modules for related codes and record freeze-frame data to understand when the fault occurs
Inspect the phase Z wiring and connectors for damage, corrosion, or loose terminals, and repair as needed
Measure resistance and insulation on the phase Z circuit and compare with the other phases to isolate a motor or cable fault
Check the inverter power and ground connections, including chassis grounds, for voltage drops under load
Perform the manufacturer's specified active tests or signal checks for the phase Z current sensor and inverter output
If the inverter is suspect, follow the service procedure to test or replace the inverter assembly
After repairs, clear codes and verify the fault does not return during a road test under load

Phase Z current faults often misdiagnosed

A low current reading in one phase can be caused by a simple loose connector pin that only loses contact when the motor rocks under torque, so always wiggle-test the harness while monitoring live data.
Technicians sometimes replace the inverter when the real problem is a chafed phase cable shorting to the motor housing only when the suspension compresses, so inspect cable routing carefully.
The code can set intermittently from electromagnetic interference affecting the current sensor signal, especially if aftermarket accessories are wired near the inverter harness.
A failing 12-volt battery or poor ground can cause the inverter to misread phase currents, so always verify supply voltage and ground integrity before condemning expensive components.
This code does not always mean the motor is failing; a software update for the inverter controller has resolved low-current faults on some vehicles without any hardware replacement.

Can I keep driving with P2C70?

Do not continue driving with this code because a phase current fault can cause sudden loss of drive power or further damage to the inverter and motor. 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.